（postgreSQL错误）致命：角色“演示”；不存在（PG :: Error） [英] (postgreSQL error) FATAL: role "demo" does not exist (PG::Error)

问题描述

因此，我刚刚在HomeBrew中安装了postgreSQL，并使用以下命令初始化了新的demo_app： rails new demo_app -d postgresql 命令。

So I've just installed postgreSQL with HomeBrew and have initialized my new demo_app with the: rails new demo_app -d postgresql command.

虽然，启动服务器 rails s 时出现以下错误。

Albeit, I am getting the following error when starting up the server rails s.

Snippit ：

/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:1216:in `initialize': FATAL:  role "demo" does not exist (PG::Error)

完整日志：

/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:1216:in `initialize': FATAL:  role "demo" does not exist (PG::Error)
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:1216:in `new'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:1216:in `connect'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:324:in `initialize'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:28:in `new'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/postgresql_adapter.rb:28:in `postgresql_connection'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:315:in `new_connection'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:325:in `checkout_new_connection'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:247:in `block (2 levels) in checkout'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:242:in `loop'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:242:in `block in checkout'
    from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:239:in `checkout'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:102:in `block in connection'
    from /usr/local/rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:101:in `connection'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_pool.rb:410:in `retrieve_connection'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_specification.rb:171:in `retrieve_connection'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/connection_adapters/abstract/connection_specification.rb:145:in `connection'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.13/lib/active_record/railtie.rb:88:in `block in <class:Railtie>'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.13/lib/rails/initializable.rb:30:in `instance_exec'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.13/lib/rails/initializable.rb:30:in `run'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.13/lib/rails/initializable.rb:55:in `block in run_initializers'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.13/lib/rails/initializable.rb:54:in `each'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.13/lib/rails/initializable.rb:54:in `run_initializers'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.13/lib/rails/application.rb:136:in `initialize!'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.13/lib/rails/railtie/configurable.rb:30:in `method_missing'
    from /Users/anthonypanepinto/Sites/new_demo/demo/config/environment.rb:5:in `<top (required)>'
    from /Users/anthonypanepinto/Sites/new_demo/demo/config.ru:3:in `require'
    from /Users/anthonypanepinto/Sites/new_demo/demo/config.ru:3:in `block in <main>'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.5/lib/rack/builder.rb:51:in `instance_eval'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.5/lib/rack/builder.rb:51:in `initialize'
    from /Users/anthonypanepinto/Sites/new_demo/demo/config.ru:in `new'
    from /Users/anthonypanepinto/Sites/new_demo/demo/config.ru:in `<main>'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.5/lib/rack/builder.rb:40:in `eval'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.5/lib/rack/builder.rb:40:in `parse_file'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.5/lib/rack/server.rb:200:in `app'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.13/lib/rails/commands/server.rb:46:in `app'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.5/lib/rack/server.rb:304:in `wrapped_app'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.5/lib/rack/server.rb:254:in `start'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.13/lib/rails/commands/server.rb:70:in `start'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.13/lib/rails/commands.rb:55:in `block in <top (required)>'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.13/lib/rails/commands.rb:50:in `tap'
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.13/lib/rails/commands.rb:50:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

推荐答案

创建Rails应用时，您必须使用postgres创建数据库以使其正常工作。

When your create rails app, you must create a database with postgres for that it works.

createdb demo

并检查您的 config / database.yml

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