我是Stack Overflow和Ruby on Rails的新手。我的问题是，当我运行命令rake db：create或rake db：migrate时，测试数据库会受到影响，但开发数据库不受影响。
rails（3.2.2）
我的database.yml：
# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test: &test
adapter: postgresql
encoding: unicode
database: ticketee_test
pool: 5
username: ticketee
password: my_password_here
development:
adapter: postgresql
encoding: unicode
database: ticketee_development
pool: 5
username: ticketee
password: my_password_here
production:
adapter: postgresql
encoding: unicode
database: ticketee_production
pool: 5
username: ticketee
password: my_password_here
cucumber:
<<: *test
感谢您的建议，但我担心这不是原因。我的RAILS_ENV =开发。当我启动rails服务器时，服务器运行开发数据库。如果我运行“rails server -e test”，那么服务器将使用测试数据库。我仍然不确定为什么我的测试数据库上正在运行迁移...
更新： 基于一个建议，我评论了除开发之外的所有数据库配置，现在我收到一个错误。我正在运行postgresql，我安装了gem'pg'。首先，我的新database.yml：
development:
adapter: postgresql
encoding: unicode
database: ticketee_development
pool: 5
username: ticketee
password: my_password_here
# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
#test: &test
# adapter: postgresql
# encoding: unicode
# database: ticketee_test
# pool: 5
# username: ticketee
# password: my_password_here
#production:
# adapter: postgresql
# encoding: unicode
# database: ticketee_production
# pool: 5
# username: ticketee
# password: my_password_here
#cucumber:
# <<: *test
我的错误讯息！
Someguys-MacBook-Air:ticketee someguy$ rake db:migrate
rake aborted!
database configuration does not specify adapter
Tasks: TOP => db:migrate => db:load_config
(See full trace by running task with --trace)
Someguys-MacBook-Air:ticketee someguy$ rake db:migrate -t
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
** Invoke db:load_config (first_time)
** Invoke rails_env (first_time)
** Execute rails_env
** Execute db:load_config
rake aborted!
database configuration does not specify adapter
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/activerecord-3.2.2/lib/active_record/connection_adapters/abstract/connection_specification.rb:45:in `resolve_hash_connection'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/activerecord-3.2.2/lib/active_record/connection_adapters/abstract/connection_specification.rb:39:in `resolve_string_connection'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/activerecord-3.2.2/lib/active_record/connection_adapters/abstract/connection_specification.rb:23:in `spec'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/activerecord-3.2.2/lib/active_record/connection_adapters/abstract/connection_specification.rb:127:in `establish_connection'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/activerecord-3.2.2/lib/active_record/railtie.rb:76:in `block (2 levels) in <class:Railtie>'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/activesupport-3.2.2/lib/active_support/lazy_load_hooks.rb:36:in `instance_eval'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/activesupport-3.2.2/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/activesupport-3.2.2/lib/active_support/lazy_load_hooks.rb:43:in `block in run_load_hooks'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/activesupport-3.2.2/lib/active_support/lazy_load_hooks.rb:42:in `each'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/activesupport-3.2.2/lib/active_support/lazy_load_hooks.rb:42:in `run_load_hooks'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/activerecord-3.2.2/lib/active_record/base.rb:718:in `<top (required)>'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/activerecord-3.2.2/lib/active_record/railties/databases.rake:6:in `block (2 levels) in <top (required)>'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `call'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `block in execute'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `each'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `execute'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
/Users/someguy/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/lib/rake/task.rb:176:in `block in invoke_prerequisites'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/lib/rake/task.rb:174:in `each'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/lib/rake/task.rb:174:in `invoke_prerequisites'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/lib/rake/task.rb:157:in `block in invoke_with_call_chain'
/Users/someguy/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/lib/rake/task.rb:144:in `invoke'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/lib/rake/application.rb:116:in `invoke_task'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block (2 levels) in top_level'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `each'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block in top_level'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/lib/rake/application.rb:88:in `top_level'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/lib/rake/application.rb:66:in `block in run'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/bin/rake:19:in `load'
/Users/someguy/.rvm/gems/ruby-1.9.3-p125@defaultGems/bin/rake:19:in `<main>'
使用上面的database.yml，rake db：create：all RAN CORRECTLY并创建我的表。但是，我的迁移仍然失败，堆栈跟踪与上面的堆栈跟踪相同。
我将database.yml更改为： 发展： 适配器：sqlite3 数据库：db / development.sqlite3 游泳池：5 超时：5000
test:
adapter: sqlite3
database: db/test.sqlite3
pool: 5
timeout: 5000
production:
adapter: sqlite3
database: db/production.sqlite3
pool: 5
timeout: 5000
更新：我完全将我的database.yml更改为：
development:
adapter: sqlite3
database: db/development.sqlite3
pool: 5
timeout: 5000
test: &test
adapter: sqlite3
database: db/test.sqlite3
pool: 5
timeout: 5000
production:
adapter: sqlite3
database: db/production.sqlite3
pool: 5
timeout: 5000
cucumber:
<<: *test
现在，当我运行rake db：drop：all，然后是rake db：migrate时会发生这种情况。 rake db：migrate命令运行迁移，创建db / test.sqlite3并向其添加表。因此，我的迁移仍在测试环境中运行。当我运行rake环境RAILS_ENV =开发db：migrate时，同样的事情发生了，我得到了一个test.sqlite3文件......
答案 0 :(得分：5)
有一个很棒的＆＃39;排队 了activerecord / LIB / active_record /任务/ database_tasks.rb：
environments << 'test' if environment == 'development' && ENV['RAILS_ENV'].nil?
，直到2014年1月8日看起来像：
environments << 'test' if environment == 'development'
答案 1 :(得分：2)
我昨晚开始遇到完全相同的问题。不知道是什么导致了这一点，但终于找到了一个有效的解决方案。在config / environments / develop.rb中的配置块内，我添加了：
Rails.env = 'development'
我希望这对你有用
答案 2 :(得分：2)
听起来你的解决方案可能涉及到一些事情。由于现有元素，您的环境可能会使迁移混乱。使用以下方法重置数据库：
rake db:reset
或
rake db:drop db:create
根据您的环境，您应该可以进行迁移。
rake db:migrate
PS - 您可能必须在每个命令的开头添加bundle exec。
答案 3 :(得分：0)
您错过了yml文件中的host: localhost。
将您的配置更改为：
development:
adapter: postgresql
encoding: unicode
host: localhost
database: ticketee_development
pool: 5
username: ticketee
password: my_password_here
答案 4 :(得分：0)
分叉错误！ 可能是一些缓存或日志问题它表明我们的代码中没有任何错误。
我的团队解决了。
删除项目
git克隆项目
配置database.yml
启动服务器
一切都还可以！
错误消失的同一个项目！ 所以我们认为它是环境问题或者cach或log。
答案 5 :(得分：0)
您可以使用rake db：migrate RAILS_ENV =“development”
或者您可以使用
设置RAILS_ENV =开发
rake db：migrate