Ruby on rails 4 无法在Desive gem上添加_索引列

各位编码员

我需要你的帮助

Rails版本：4.2.4 Ruby版本：Ruby 2.2.3p173（2015-08-18修订版51636）[x86_64-darwin15]

我正试图在youtube上根据本教程制作一个twitter克隆。 ---链接：

在视频上的7:35标记之前，我一切正常

在我运行命令“railsgeneratemigation add_username_to_users username:string:uniq”之后。所有适当文件的名称都以升华文本显示在文件树上，但当我转到schema.rb时

--I can't seem to find the "the add_index users, ["username"], name: "index_users_on_username", unique: true doesn't show. " in the schema.rb directory

以下是文件：

app/db/migrate/add_username_至_用户

class AddUsernameToUsers < ActiveRecord::Migration
  def change
    add_column :users, :username, :string
    add_index :users, :username, unique: true
  end
end

这是我运行rake db:migrate时得到的结果

== 20160210230711 AddUsernameToUsers: migrating ===============================
-- add_column(:users, :username, :string)
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:

SQLite3::SQLException: duplicate column name: username: ALTER TABLE "users" ADD "username" varchar/Users/krischery/TwitterClone/db/migrate/20160210230711_add_username_to_users.rb:3:in `change'
ActiveRecord::StatementInvalid: SQLite3::SQLException: duplicate column name: username: ALTER TABLE "users" ADD "username" varchar
/Users/krischery/TwitterClone/db/migrate/20160210230711_add_username_to_users.rb:3:in `change'
SQLite3::SQLException: duplicate column name: username
/Users/krischery/TwitterClone/db/migrate/20160210230711_add_username_to_users.rb:3:in `change'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)
Kriss-MBP:TwitterClone krischery$ rake db:migrate --trace
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
** Invoke db:load_config (first_time)
** Execute db:load_config
** Execute db:migrate
== 20160210230711 AddUsernameToUsers: migrating ===============================
-- add_column(:users, :username, :string)
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:

SQLite3::SQLException: duplicate column name: username: ALTER TABLE "users" ADD "username" varchar/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `initialize'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `new'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `prepare'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:134:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:329:in `block in execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract_adapter.rb:473:in `block in log'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract_adapter.rb:467:in `log'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:329:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/schema_statements.rb:393:in `add_column'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:453:in `add_column'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:662:in `block in method_missing'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:631:in `block in say_with_time'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/benchmark.rb:288:in `measure'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:631:in `say_with_time'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:651:in `method_missing'
/Users/krischery/TwitterClone/db/migrate/20160210230711_add_username_to_users.rb:3:in `change'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:605:in `exec_migration'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:589:in `block (2 levels) in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/benchmark.rb:288:in `measure'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:588:in `block in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:292:in `with_connection'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:587:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:765:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:995:in `block in execute_migration_in_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:1041:in `block in ddl_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `block in transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/transaction.rb:184:in `within_new_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/transactions.rb:220:in `transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:1041:in `ddl_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:994:in `execute_migration_in_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:956:in `block in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:952:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:952:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:820:in `up'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:798:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/tasks/database_tasks.rb:137:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/railties/databases.rake:44:in `block (2 levels) in <top (required)>'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:240:in `call'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:240:in `block in execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:235:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:235:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:179:in `block in invoke_with_call_chain'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:172:in `invoke_with_call_chain'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:165:in `invoke'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:150:in `invoke_task'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block (2 levels) in top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block in top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:115:in `run_with_threads'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:100:in `top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:78:in `block in run'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:176:in `standard_exception_handling'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:75:in `run'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/bin/rake:33:in `<top (required)>'
/Users/krischery/.rbenv/versions/2.2.3/bin/rake:23:in `load'
/Users/krischery/.rbenv/versions/2.2.3/bin/rake:23:in `<main>'
ActiveRecord::StatementInvalid: SQLite3::SQLException: duplicate column name: username: ALTER TABLE "users" ADD "username" varchar
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `initialize'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `new'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `prepare'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:134:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:329:in `block in execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract_adapter.rb:473:in `block in log'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract_adapter.rb:467:in `log'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:329:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/schema_statements.rb:393:in `add_column'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:453:in `add_column'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:662:in `block in method_missing'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:631:in `block in say_with_time'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/benchmark.rb:288:in `measure'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:631:in `say_with_time'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:651:in `method_missing'
/Users/krischery/TwitterClone/db/migrate/20160210230711_add_username_to_users.rb:3:in `change'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:605:in `exec_migration'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:589:in `block (2 levels) in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/benchmark.rb:288:in `measure'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:588:in `block in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:292:in `with_connection'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:587:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:765:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:995:in `block in execute_migration_in_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:1041:in `block in ddl_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `block in transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/transaction.rb:184:in `within_new_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/transactions.rb:220:in `transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:1041:in `ddl_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:994:in `execute_migration_in_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:956:in `block in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:952:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:952:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:820:in `up'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:798:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/tasks/database_tasks.rb:137:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/railties/databases.rake:44:in `block (2 levels) in <top (required)>'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:240:in `call'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:240:in `block in execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:235:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:235:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:179:in `block in invoke_with_call_chain'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:172:in `invoke_with_call_chain'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:165:in `invoke'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:150:in `invoke_task'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block (2 levels) in top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block in top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:115:in `run_with_threads'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:100:in `top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:78:in `block in run'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:176:in `standard_exception_handling'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:75:in `run'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/bin/rake:33:in `<top (required)>'
/Users/krischery/.rbenv/versions/2.2.3/bin/rake:23:in `load'
/Users/krischery/.rbenv/versions/2.2.3/bin/rake:23:in `<main>'
SQLite3::SQLException: duplicate column name: username
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `initialize'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `new'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `prepare'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:134:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:329:in `block in execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract_adapter.rb:473:in `block in log'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract_adapter.rb:467:in `log'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:329:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/schema_statements.rb:393:in `add_column'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:453:in `add_column'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:662:in `block in method_missing'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:631:in `block in say_with_time'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/benchmark.rb:288:in `measure'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:631:in `say_with_time'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:651:in `method_missing'
/Users/krischery/TwitterClone/db/migrate/20160210230711_add_username_to_users.rb:3:in `change'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:605:in `exec_migration'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:589:in `block (2 levels) in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/benchmark.rb:288:in `measure'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:588:in `block in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:292:in `with_connection'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:587:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:765:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:995:in `block in execute_migration_in_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:1041:in `block in ddl_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `block in transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/transaction.rb:184:in `within_new_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/transactions.rb:220:in `transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:1041:in `ddl_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:994:in `execute_migration_in_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:956:in `block in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:952:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:952:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:820:in `up'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:798:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/tasks/database_tasks.rb:137:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/railties/databases.rake:44:in `block (2 levels) in <top (required)>'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:240:in `call'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:240:in `block in execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:235:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:235:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:179:in `block in invoke_with_call_chain'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:172:in `invoke_with_call_chain'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:165:in `invoke'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:150:in `invoke_task'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block (2 levels) in top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block in top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:115:in `run_with_threads'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:100:in `top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:78:in `block in run'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:176:in `standard_exception_handling'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:75:in `run'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/bin/rake:33:in `<top (required)>'
/Users/krischery/.rbenv/versions/2.2.3/bin/rake:23:in `load'
/Users/krischery/.rbenv/versions/2.2.3/bin/rake:23:in `<main>'
Tasks: TOP => db:migrate
Kriss-MBP:TwitterClone krischery$ 

==20160210230711 AddUsernameToUsers:正在迁移===============================
--添加列（：用户，：用户名，：字符串）
雷克流产了！
StandardError:发生错误，此迁移和所有后续迁移已取消：
SQLite3:：SQLException:重复列名：用户名：ALTER TABLE“users”添加“username”varchar/users/krischery/TwitterClone/db/migrate/20160210230711_添加_username_到_users。rb:3:在“更改”中
ActiveRecord:：StatementInvalid:SQLite3:：SQLException:重复列名：用户名：ALTER TABLE“users”添加“username”varchar
/Users/krischery/TwitterClone/db/migrate/20160210230711\u向用户添加用户名。rb:3:in'change'
SQLite3:：SQLException:重复的列名：用户名
/Users/krischery/TwitterClone/db/migrate/20160210230711\u向用户添加用户名。rb:3:in'change'
任务：TOP=>db:migrate
（通过使用--trace运行任务查看完整跟踪）
Kriss MBP:TwitterClone krischery$rake db:migrate--trace
**调用数据库：迁移（第一次）
**调用环境（第一次）
**执行环境
**调用数据库：加载配置（第一次）
**执行db:load\u config
**执行数据库：迁移
==20160210230711 AddUsernameToUsers:正在迁移===============================
--添加列（：用户，：用户名，：字符串）
雷克流产了！
StandardError:发生错误，此迁移和所有后续迁移已取消：
SQLite3:：SQLException:重复列名：用户名：ALTER TABLE“users”添加“username”varchar/users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/SQLite3-1.3.11/lib/SQLite3/database.rb:91:在“初始化”中
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:“新建”
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:在“准备”中
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:134:在“执行”中
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active\u record/connection\u adapters/sqlite3\u adapter.rb:329:in'block in execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active\u record/connection\u adapters/abstract\u adapter.rb:473:in“block in log”
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active\u support/notifications/instrumenter.rb:20:in“instrument”
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active\u record/connection\u adapters/abstract\u adapter.rb:467:在“日志”中
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active\u record/connection\u adapters/sqlite3\u adapter.rb:329:“执行”中
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active\u record/connection\u adapters/abstract/schema\u statements.rb:393:“添加”列中
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active\u record/connection\u adapters/sqlite3\u adapter.rb:453:“添加列”中
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active\u record/migration.rb:662:“方法中的块缺失”
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active\u record/migration.rb:631:in`block in say\u with_time'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/benchmark.rb:288:in'measure'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active\u record/migration.rb:631:in“随时间说”
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:651:in'method_missing'
/Users/krischery/TwitterClone/db/migrate/20160210230711\u向用户添加用户名。rb:3:in'change'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active\u record/migration.rb:605:in'exec\u migration'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active\u record/migration.rb:589:migrate中的“块（2级）”中
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/benchmark.rb:288:in'measure'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active\u record/migration.rb:588:在“迁移中的块”中
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active\u record/connection\u adapters/abstract/connection\u pool.rb:292:in`with\u connection'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active\u record/migration.rb:587:在“migrate”中
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active\u record/migration.rb:765:在“migrate”中
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active\u record/migration.rb:995:在“执行中的块\u迁移\u在\u事务中”
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:1041:in`block in ddl_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active\u record/connection\u adapters/abstract/database\u statements.rb:213:“事务中的块”
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/act
== 20160210230711 AddUsernameToUsers: migrating ===============================
-- add_column(:users, :username, :string)
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:

SQLite3::SQLException: duplicate column name: username: ALTER TABLE "users" ADD "username" varchar/Users/krischery/TwitterClone/db/migrate/20160210230711_add_username_to_users.rb:3:in `change'
ActiveRecord::StatementInvalid: SQLite3::SQLException: duplicate column name: username: ALTER TABLE "users" ADD "username" varchar
/Users/krischery/TwitterClone/db/migrate/20160210230711_add_username_to_users.rb:3:in `change'
SQLite3::SQLException: duplicate column name: username
/Users/krischery/TwitterClone/db/migrate/20160210230711_add_username_to_users.rb:3:in `change'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)
Kriss-MBP:TwitterClone krischery$ rake db:migrate --trace
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
** Invoke db:load_config (first_time)
** Execute db:load_config
** Execute db:migrate
== 20160210230711 AddUsernameToUsers: migrating ===============================
-- add_column(:users, :username, :string)
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:

SQLite3::SQLException: duplicate column name: username: ALTER TABLE "users" ADD "username" varchar/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `initialize'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `new'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `prepare'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:134:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:329:in `block in execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract_adapter.rb:473:in `block in log'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract_adapter.rb:467:in `log'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:329:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/schema_statements.rb:393:in `add_column'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:453:in `add_column'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:662:in `block in method_missing'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:631:in `block in say_with_time'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/benchmark.rb:288:in `measure'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:631:in `say_with_time'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:651:in `method_missing'
/Users/krischery/TwitterClone/db/migrate/20160210230711_add_username_to_users.rb:3:in `change'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:605:in `exec_migration'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:589:in `block (2 levels) in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/benchmark.rb:288:in `measure'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:588:in `block in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:292:in `with_connection'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:587:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:765:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:995:in `block in execute_migration_in_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:1041:in `block in ddl_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `block in transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/transaction.rb:184:in `within_new_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/transactions.rb:220:in `transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:1041:in `ddl_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:994:in `execute_migration_in_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:956:in `block in migrate'
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/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:952:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:820:in `up'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:798:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/tasks/database_tasks.rb:137:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/railties/databases.rake:44:in `block (2 levels) in <top (required)>'
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/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:172:in `invoke_with_call_chain'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:165:in `invoke'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:150:in `invoke_task'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block (2 levels) in top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block in top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:115:in `run_with_threads'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:100:in `top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:78:in `block in run'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:176:in `standard_exception_handling'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:75:in `run'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/bin/rake:33:in `<top (required)>'
/Users/krischery/.rbenv/versions/2.2.3/bin/rake:23:in `load'
/Users/krischery/.rbenv/versions/2.2.3/bin/rake:23:in `<main>'
ActiveRecord::StatementInvalid: SQLite3::SQLException: duplicate column name: username: ALTER TABLE "users" ADD "username" varchar
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `initialize'
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/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:329:in `block in execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract_adapter.rb:473:in `block in log'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract_adapter.rb:467:in `log'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:329:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/schema_statements.rb:393:in `add_column'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:453:in `add_column'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:662:in `block in method_missing'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:631:in `block in say_with_time'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/benchmark.rb:288:in `measure'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:631:in `say_with_time'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:651:in `method_missing'
/Users/krischery/TwitterClone/db/migrate/20160210230711_add_username_to_users.rb:3:in `change'
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/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:589:in `block (2 levels) in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/benchmark.rb:288:in `measure'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:588:in `block in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:292:in `with_connection'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:587:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:765:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:995:in `block in execute_migration_in_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:1041:in `block in ddl_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `block in transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/transaction.rb:184:in `within_new_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/transactions.rb:220:in `transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:1041:in `ddl_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:994:in `execute_migration_in_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:956:in `block in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:952:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:952:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:820:in `up'
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/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/railties/databases.rake:44:in `block (2 levels) in <top (required)>'
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/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
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/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block in top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:115:in `run_with_threads'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:100:in `top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:78:in `block in run'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:176:in `standard_exception_handling'
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/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/bin/rake:33:in `<top (required)>'
/Users/krischery/.rbenv/versions/2.2.3/bin/rake:23:in `load'
/Users/krischery/.rbenv/versions/2.2.3/bin/rake:23:in `<main>'
SQLite3::SQLException: duplicate column name: username
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `initialize'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `new'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `prepare'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:134:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:329:in `block in execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract_adapter.rb:473:in `block in log'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activesupport-4.2.4/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract_adapter.rb:467:in `log'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:329:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/schema_statements.rb:393:in `add_column'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/sqlite3_adapter.rb:453:in `add_column'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:662:in `block in method_missing'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:631:in `block in say_with_time'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/benchmark.rb:288:in `measure'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:631:in `say_with_time'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:651:in `method_missing'
/Users/krischery/TwitterClone/db/migrate/20160210230711_add_username_to_users.rb:3:in `change'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:605:in `exec_migration'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:589:in `block (2 levels) in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/benchmark.rb:288:in `measure'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:588:in `block in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:292:in `with_connection'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:587:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:765:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:995:in `block in execute_migration_in_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:1041:in `block in ddl_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `block in transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/transaction.rb:184:in `within_new_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/transactions.rb:220:in `transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:1041:in `ddl_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:994:in `execute_migration_in_transaction'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:956:in `block in migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:952:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:952:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:820:in `up'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/migration.rb:798:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/tasks/database_tasks.rb:137:in `migrate'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/activerecord-4.2.4/lib/active_record/railties/databases.rake:44:in `block (2 levels) in <top (required)>'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:240:in `call'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:240:in `block in execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:235:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:235:in `execute'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:179:in `block in invoke_with_call_chain'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/2.2.0/monitor.rb:211:in `mon_synchronize'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:172:in `invoke_with_call_chain'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/task.rb:165:in `invoke'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:150:in `invoke_task'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block (2 levels) in top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `each'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block in top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:115:in `run_with_threads'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:100:in `top_level'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:78:in `block in run'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:176:in `standard_exception_handling'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/lib/rake/application.rb:75:in `run'
/Users/krischery/.rbenv/versions/2.2.3/lib/ruby/gems/2.2.0/gems/rake-10.5.0/bin/rake:33:in `<top (required)>'
/Users/krischery/.rbenv/versions/2.2.3/bin/rake:23:in `load'
/Users/krischery/.rbenv/versions/2.2.3/bin/rake:23:in `<main>'
Tasks: TOP => db:migrate
Kriss-MBP:TwitterClone krischery$