Ruby on rails 使用rake db重置SQLite数据库时出错：重置_Ruby On Rails_Database_Sqlite_Rake_Reset

Ruby on rails 使用rake db重置SQLite数据库时出错：重置

ruby-on-rails database sqlite

Ruby on rails 使用rake db重置SQLite数据库时出错：重置,ruby-on-rails,database,sqlite,rake,reset,Ruby On Rails,Database,Sqlite,Rake,Reset,我已成功创建了一个数据库，并使用以下工具执行了第一次迁移： class CreateUsers < ActiveRecord::Migration def change create_table :users do |t| t.string :name t.string :email t.timestamps end end end 我不确定是什么原因导致了这个问题，也不确定如何调试它，所以我们非常感谢您的帮助我正在运行Ra

我已成功创建了一个数据库，并使用以下工具执行了第一次迁移：

class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users do |t|
      t.string :name
      t.string :email

      t.timestamps
    end
  end
end

我不确定是什么原因导致了这个问题，也不确定如何调试它，所以我们非常感谢您的帮助

我正在运行Rails 3.1

错误的完整跟踪是：

** Invoke db:reset (first_time)
** Invoke db:drop (first_time)
** Invoke db:load_config (first_time)
** Invoke rails_env (first_time)
** Execute rails_env
** Execute db:load_config
** Execute db:drop
** Invoke db:setup (first_time)
** Invoke db:create (first_time)
** Invoke db:load_config 
** Execute db:create
db/test.sqlite3 already exists
** Invoke db:schema:load (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute db:schema:load
-- create_table("users", {:force=>true})
   -> 0.0050s
-- initialize_schema_migrations_table()
   -> 0.0053s
-- assume_migrated_upto_version(20111212200427, ["/Users/xxxx/My_Work/Resources/Rails/Books/Rails-Tutorial/Sample-App/sample_app/db/migrate"])
   -> 0.0055s
** Invoke db:seed (first_time)
** Invoke db:abort_if_pending_migrations (first_time)
** Invoke environment 
** Execute db:abort_if_pending_migrations
** Execute db:seed
rake aborted!
can't convert nil into String
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/railties-3.1.0/lib/rails/engine.rb:487:in `exist?'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/railties-3.1.0/lib/rails/engine.rb:487:in `load_seed'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.0/lib/active_record/railties/databases.rake:299:in `block (2 levels) in <top (required)>'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `call'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `block in execute'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `each'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `execute'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
/Users/xxxx/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:176:in `block in invoke_prerequisites'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:174:in `each'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:174:in `invoke_prerequisites'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:157:in `block in invoke_with_call_chain'
/Users/xxxx/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:176:in `block in invoke_prerequisites'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:174:in `each'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:174:in `invoke_prerequisites'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:157:in `block in invoke_with_call_chain'
/Users/xxxx/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:144:in `invoke'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/application.rb:116:in `invoke_task'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block (2 levels) in top_level'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `each'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block in top_level'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/application.rb:88:in `top_level'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/application.rb:66:in `block in run'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/bin/rake:19:in `load'
/Users/xxxx/.rvm/gems/ruby-1.9.3-p0/bin/rake:19:in `<main>'
Tasks: TOP => db:reset => db:setup => db:seed

调用数据库：重置（第一次） **调用数据库：删除（第一次） **调用数据库：加载配置（第一次） **调用rails_env（第一次） **执行rails_env **执行db:load\u config **执行db:drop **调用数据库：设置（第一次） **调用数据库：创建（第一次） **调用db:load\u config **执行数据库：创建 db/test.sqlite3已存在 **调用数据库：模式：加载（第一次） **调用环境（第一次） **执行环境 **执行db:schema:load --创建_表（“用户”，{:force=>true}） ->0.0050s --初始化\u架构\u迁移\u表（） ->0.0053s --假设已迁移到版本（20111212200427，[“/Users/xxxx/My_Work/Resources/Rails/Books/Rails Tutorial/Sample App/Sample_App/db/migrate”]） ->0.0055s **调用数据库：种子（第一次） **调用数据库：如果挂起迁移，则中止（第一次） **调用环境 **执行数据库：如果\u挂起\u迁移，则中止\u **执行db:seed 雷克流产了！无法将nil转换为字符串 /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/railties-3.1.0/lib/rails/engine.rb:487:是否存在 /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/railties-3.1.0/lib/rails/engine.rb:487:in'load_seed' /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/activerecord-3.1.0/lib/active\u record/railties/databases.rake:299:in `块（2层）in' /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:205:in'call' /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:205:在“执行中的块”中 /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:200:in'each' /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:200:in'execute' /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:158:in`block in invoke_with_call_chain' /Users/xxxx/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/monitor.rb:211:in'mon_synchronize' /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:151:invoke\u with\u call\u chain' /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:176:in`block in invoke_前提条件' /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:174:in'each' /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:174:在“调用”前提条件中 /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:157:“使用调用链阻止调用” /Users/xxxx/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/monitor.rb:211:in'mon_synchronize' /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:151:invoke\u with\u call\u chain' /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:176:in`block in invoke_前提条件' /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:174:in'each' /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:174:在“调用”前提条件中 /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:157:“使用调用链阻止调用” /Users/xxxx/.rvm/rubies/ruby-1.9.3-p0/lib/ruby/1.9.1/monitor.rb:211:in'mon_synchronize' /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:151:invoke\u with\u call\u chain' /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/task.rb:144:in'invoke' /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/application.rb:116:在“调用任务”中 /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/application.rb:94:在“顶层的块（2层）”中 /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/application.rb:94:in'each' /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/application.rb:94:在“顶层块”中 /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/application.rb:133:在“标准异常处理”中 /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/application.rb:88:“顶级” /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/application.rb:66:在“运行中的块”中 /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/application.rb:133:在“标准异常处理”中 /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/lib/rake/application.rb:63:in'run' /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/gems/rake-0.9.2.2/bin/rake:33:in`' /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/bin/rake:19:in'load' /Users/xxxx/.rvm/gems/ruby-1.9.3-p0/bin/rake:19:in`' 任务：TOP=>db:reset=>db:setup=>db:seed ，重新创建一个空的将解决您的问题：

touch db/seeds.rb

，重新创建一个空的将解决您的问题：

touch db/seeds.rb

一定是删除了。从上一次提交中抓取了它，它工作了。谢谢。添加答案，我会将其标记为Solved必须删除它。从上一次提交中抓取了它，它工作了。谢谢。添加一个答案，我会将其标记为已解决