Ruby on rails “未定义的方法”；接受；for nil:NilClass在运行rake任务时
我有一个带有mysql2（0.5.1）和MyQSL服务器的Ruby on rails “未定义的方法”；接受；for nil:NilClass在运行rake任务时,ruby-on-rails,ruby,ruby-on-rails-3.2,mysql2,Ruby On Rails,Ruby,Ruby On Rails 3.2,Mysql2,我有一个带有mysql2（0.5.1）和MyQSL服务器的rubyonrails（3.2.2）应用程序 mysql——版本 mysql——版本8.0.11，适用于x86_64（自制）上的osx10.13 当我执行一个bundle exec rake db:setup时，就会创建数据库 当我尝试使用bundle exec rake db:migrate时，会出现以下故障： bundle exec rake db:migrate --trace
rubyonrailsmysql——版本bundle exec rake db:setupbundle exec rake db:migratebundle exec 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
rake aborted!
NoMethodError: undefined method `accept' for nil:NilClass
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Tasks: TOP => db:migrate
mysql-u root-pdevelopment:
adapter: mysql2
host: 127.0.0.1
port: 3306
database: mydb_development
username: root
password: root
rake aborted!
LoadError: Please install the mysql2 adapter: `gem install activerecord-mysql2-adapter` (can't activate mysql2 (~> 0.3.10), already activated mysql2-0.4.10. Make sure all dependencies are added to Gemfile.)
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Gem::LoadError: can't activate mysql2 (~> 0.3.10), already activated mysql2-0.4.10. Make sure all dependencies are added to Gemfile.
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/rubygems_integration.rb:408:in `block (2 levels) in replace_gem'
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/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:172:in `invoke_with_call_chain'
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/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block (2 levels) in top_level'
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/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/exe/bundle:22:in `<top (required)>'
/Users/janjezek/.rbenv/versions/2.3.3/bin/bundle:22:in `load'
/Users/janjezek/.rbenv/versions/2.3.3/bin/bundle:22:in `<main>'
Tasks: TOP => db:setup => db:schema:load_if_ruby => db:create
rake中止！
LoadError:请安装mysql2适配器：`gem安装activerecord-mysql2-adapter`（无法激活mysql2（~>0.3.10），已激活mysql2-0.4.10。请确保将所有依赖项添加到Gemfile。）
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/rubygems\u integration.rb:408:replace\u gem中的“块（2级）”中
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active\u record/connection\u adapters/mysql2\u adapter.rb:3:in`'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-3.2.22/lib/active\u support/dependencies.rb:251:在'require'中
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-3.2.22/lib/active\u support/dependencies.rb:251:“请求中的块”中
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-3.2.22/lib/active\u support/dependencies.rb:236:in'load\u dependencity'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-3.2.22/lib/active\u support/dependencies.rb:251:在'require'中
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active\u record/connection\u adapters/abstract/connection\u specification.rb:50:in`resolve\u hash\u connection'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active\u record/connection\u adapters/abstract/connection\u specification.rb:29:in'spec'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active\u record/connection\u adapters/abstract/connection\u specification.rb:130:在“建立连接”中
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active\u record/railties/databases.rake:101:in“create\u database”
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active\u record/railties/databases.rake:62:in“block（3层）in”
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active\u record/railties/databases.rake:62:in'each'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active_record/railties/databases.rake:62:in“block（2层）in”
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:240:在“执行中的块”中
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:235:“每个”
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:235:在“执行”中
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:179:在“调用中的块与调用链”
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/2.3.0/monitor.rb:214:in'mon_synchronize'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:172:'invoke_with_call_chain'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:201:“调用中的块”
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:199:在'each'中
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:199:在“调用”中
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:178:在“调用中的块与调用链”
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/2.3.0/monitor.rb:214:in'mon_synchronize'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:172:'invoke_with_call_chain'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:201:“调用中的块”
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:199:在'each'中
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:199:在“调用”中
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:178:在“调用中的块与调用链”
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/2.3.0/monitor.rb:214:in'mon_synchronize'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:172:'invoke_with_call_chain'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:165:在“调用”中
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:150:在“调用任务”中
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:106:在“顶层的块（2层）”中
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:106:在'each'中
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:106:在“顶层块”中
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:115:“使用线程运行”
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:100:“顶级”
/美国
development:
adapter: mysql2
host: 127.0.0.1
port: 3306
database: mydb_development
username: root
password: root
rake aborted!
LoadError: Please install the mysql2 adapter: `gem install activerecord-mysql2-adapter` (can't activate mysql2 (~> 0.3.10), already activated mysql2-0.4.10. Make sure all dependencies are added to Gemfile.)
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/rubygems_integration.rb:408:in `block (2 levels) in replace_gem'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active_record/connection_adapters/mysql2_adapter.rb:3:in `<top (required)>'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-3.2.22/lib/active_support/dependencies.rb:251:in `require'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-3.2.22/lib/active_support/dependencies.rb:251:in `block in require'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-3.2.22/lib/active_support/dependencies.rb:236:in `load_dependency'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-3.2.22/lib/active_support/dependencies.rb:251:in `require'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract/connection_specification.rb:50:in `resolve_hash_connection'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract/connection_specification.rb:29:in `spec'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract/connection_specification.rb:130:in `establish_connection'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active_record/railties/databases.rake:101:in `create_database'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active_record/railties/databases.rake:62:in `block (3 levels) in <top (required)>'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active_record/railties/databases.rake:62:in `each'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active_record/railties/databases.rake:62:in `block (2 levels) in <top (required)>'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:240:in `block in execute'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:235:in `each'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:235:in `execute'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:179:in `block in invoke_with_call_chain'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/2.3.0/monitor.rb:214:in `mon_synchronize'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:172:in `invoke_with_call_chain'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:201:in `block in invoke_prerequisites'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:199:in `each'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:199:in `invoke_prerequisites'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:178:in `block in invoke_with_call_chain'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/2.3.0/monitor.rb:214:in `mon_synchronize'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:172:in `invoke_with_call_chain'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:201:in `block in invoke_prerequisites'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:199:in `each'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:199:in `invoke_prerequisites'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:178:in `block in invoke_with_call_chain'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/2.3.0/monitor.rb:214:in `mon_synchronize'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:172:in `invoke_with_call_chain'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:165:in `invoke'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:150:in `invoke_task'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block (2 levels) in top_level'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `each'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block in top_level'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:115:in `run_with_threads'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:100:in `top_level'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:78:in `block in run'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:176:in `standard_exception_handling'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:75:in `run'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/bin/rake:33:in `<top (required)>'
/Users/janjezek/.rbenv/versions/2.3.3/bin/rake:22:in `load'
/Users/janjezek/.rbenv/versions/2.3.3/bin/rake:22:in `<top (required)>'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/cli/exec.rb:74:in `load'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/cli/exec.rb:74:in `kernel_load'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/cli/exec.rb:28:in `run'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/cli.rb:424:in `exec'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/vendor/thor/lib/thor.rb:387:in `dispatch'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/cli.rb:27:in `dispatch'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/vendor/thor/lib/thor/base.rb:466:in `start'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/cli.rb:18:in `start'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/exe/bundle:30:in `block in <top (required)>'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/friendly_errors.rb:124:in `with_friendly_errors'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/exe/bundle:22:in `<top (required)>'
/Users/janjezek/.rbenv/versions/2.3.3/bin/bundle:22:in `load'
/Users/janjezek/.rbenv/versions/2.3.3/bin/bundle:22:in `<main>'
Gem::LoadError: can't activate mysql2 (~> 0.3.10), already activated mysql2-0.4.10. Make sure all dependencies are added to Gemfile.
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/rubygems_integration.rb:408:in `block (2 levels) in replace_gem'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active_record/connection_adapters/mysql2_adapter.rb:3:in `<top (required)>'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-3.2.22/lib/active_support/dependencies.rb:251:in `require'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-3.2.22/lib/active_support/dependencies.rb:251:in `block in require'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-3.2.22/lib/active_support/dependencies.rb:236:in `load_dependency'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-3.2.22/lib/active_support/dependencies.rb:251:in `require'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract/connection_specification.rb:50:in `resolve_hash_connection'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract/connection_specification.rb:29:in `spec'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract/connection_specification.rb:130:in `establish_connection'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active_record/railties/databases.rake:101:in `create_database'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active_record/railties/databases.rake:62:in `block (3 levels) in <top (required)>'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active_record/railties/databases.rake:62:in `each'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-3.2.22/lib/active_record/railties/databases.rake:62:in `block (2 levels) in <top (required)>'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:240:in `block in execute'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:235:in `each'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:235:in `execute'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:179:in `block in invoke_with_call_chain'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/2.3.0/monitor.rb:214:in `mon_synchronize'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:172:in `invoke_with_call_chain'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:201:in `block in invoke_prerequisites'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:199:in `each'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:199:in `invoke_prerequisites'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:178:in `block in invoke_with_call_chain'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/2.3.0/monitor.rb:214:in `mon_synchronize'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:172:in `invoke_with_call_chain'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:201:in `block in invoke_prerequisites'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:199:in `each'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:199:in `invoke_prerequisites'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:178:in `block in invoke_with_call_chain'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/2.3.0/monitor.rb:214:in `mon_synchronize'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:172:in `invoke_with_call_chain'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/task.rb:165:in `invoke'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:150:in `invoke_task'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block (2 levels) in top_level'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `each'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:106:in `block in top_level'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:115:in `run_with_threads'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:100:in `top_level'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:78:in `block in run'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:176:in `standard_exception_handling'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/lib/rake/application.rb:75:in `run'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/rake-10.5.0/bin/rake:33:in `<top (required)>'
/Users/janjezek/.rbenv/versions/2.3.3/bin/rake:22:in `load'
/Users/janjezek/.rbenv/versions/2.3.3/bin/rake:22:in `<top (required)>'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/cli/exec.rb:74:in `load'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/cli/exec.rb:74:in `kernel_load'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/cli/exec.rb:28:in `run'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/cli.rb:424:in `exec'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/vendor/thor/lib/thor/command.rb:27:in `run'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in `invoke_command'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/vendor/thor/lib/thor.rb:387:in `dispatch'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/cli.rb:27:in `dispatch'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/vendor/thor/lib/thor/base.rb:466:in `start'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/cli.rb:18:in `start'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/exe/bundle:30:in `block in <top (required)>'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/lib/bundler/friendly_errors.rb:124:in `with_friendly_errors'
/Users/janjezek/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/bundler-1.16.2/exe/bundle:22:in `<top (required)>'
/Users/janjezek/.rbenv/versions/2.3.3/bin/bundle:22:in `load'
/Users/janjezek/.rbenv/versions/2.3.3/bin/bundle:22:in `<main>'
Tasks: TOP => db:setup => db:schema:load_if_ruby => db:create
# gem install mysql2 -v '0.3.21' --source 'https://rubygems.org/'
Building native extensions. This could take a while...
ERROR: Error installing mysql2:
ERROR: Failed to build gem native extension.
gem 'mysql2', '~> 0.3.21' # in Gemfile
brew uninstall mysql mysql@5.6
brew install mysql@5.7
gem uninstall activerecord-mysql2-adapter # each version
gem uninstall mysql2 # each version
bundle update mysql2
bundle install