【发布时间】：2016-02-16 13:24:24
【问题描述】：
我正在尝试在 heroku 上托管我的 rails 应用程序，我最初通常设置了 sqlite3 应用程序，因为我没有意识到它与 Heroku 不兼容。我正在尝试关注 railscast #342 但我不断收到错误并且不知道如何修复它们。当我运行命令时
bundle exec rake db:create
我收到一系列错误：
FATAL: role "jen" does not exist
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/postgresql_adapter.rb:665:in `rescue in connect'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/postgresql_adapter.rb:655:in `connect'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/postgresql_adapter.rb:242:in `initialize'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/postgresql_adapter.rb:44:in `new'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/postgresql_adapter.rb:44:in `postgresql_connection'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:438:in `new_connection'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:448:in `checkout_new_connection'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:422:in `acquire_connection'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:349:in `block in checkout'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/2.1.0/monitor.rb:211:in `mon_synchronize'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:348:in `checkout'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:263:in `block in connection'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/2.1.0/monitor.rb:211:in `mon_synchronize'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:262:in `connection'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/connection_adapters/abstract/connection_pool.rb:571:in `retrieve_connection'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/connection_handling.rb:113:in `retrieve_connection'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/connection_handling.rb:87:in `connection'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/tasks/postgresql_database_tasks.rb:8:in `connection'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/tasks/postgresql_database_tasks.rb:17:in `create'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/tasks/database_tasks.rb:93:in `create'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/tasks/database_tasks.rb:107:in `block in create_current'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/tasks/database_tasks.rb:275:in `block in each_current_configuration'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/tasks/database_tasks.rb:274:in `each'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/tasks/database_tasks.rb:274:in `each_current_configuration'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/tasks/database_tasks.rb:106:in `create_current'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/activerecord-4.2.4/lib/active_record/railties/databases.rake:17:in `block (2 levels) in <top (required)>'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/task.rb:240:in `call'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/task.rb:240:in `block in execute'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/task.rb:235:in `each'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/task.rb:235:in `execute'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/task.rb:179:in `block in invoke_with_call_chain'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/2.1.0/monitor.rb:211:in `mon_synchronize'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/task.rb:172:in `invoke_with_call_chain'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/task.rb:165:in `invoke'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/application.rb:150:in `invoke_task'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/application.rb:106:in `block (2 levels) in top_level'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/application.rb:106:in `each'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/application.rb:106:in `block in top_level'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/application.rb:115:in `run_with_threads'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/application.rb:100:in `top_level'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/application.rb:78:in `block in run'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/application.rb:176:in `standard_exception_handling'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/lib/rake/application.rb:75:in `run'
/Users/jen/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/rake-10.4.2/bin/rake:33:in `<top (required)>'
/Users/jen/.rbenv/versions/2.1.5/bin/rake:23:in `load'
/Users/jen/.rbenv/versions/2.1.5/bin/rake:23:in `<main>'
Couldn't create database for {"adapter"=>"postgresql", "encoding"=>"unicode", "database"=>"myapp_development", "pool"=>5, "username"=>"jen", "password"=>nil}
谁能解释导致这些错误的原因？我试过了
sudo su - postgres
但它要求我输入我不知道的密码。
更新：
这是我的 database.yml 文件：
# SQLite version 3.x
# gem install sqlite3
#
# Ensure the SQLite 3 gem is defined in your Gemfile
# gem 'sqlite3'
#
# default: &default
# adapter: sqlite3
# pool: 5
# timeout: 5000
# development:
# <<: *default
# database: db/development.sqlite3
# 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:
# <<: *default
# database: db/test.sqlite3
# production:
# <<: *default
# database: db/production.sqlite3
development:
adapter: postgresql
encoding: unicode
database: mygaisce_development
pool: 5
username: jen
password: secret
test:
adapter: postgresql
encoding: unicode
database: mygaisce_test
pool: 5
username: jen
password: secret
【问题讨论】：
-
您很可能需要在 postgres 中创建一个 jen 用户。试试
sudo -u postgres createuser --superuser jen然后sudo -u postgres psql然后\password jen -
谢谢，但后来我收到错误
sudo: unknown user: postgres -
你是如何安装 postgres 的？
-
在我的笔记本电脑上，我之前为另一个项目安装了它。你是这个意思吗？对于该项目，我使用了
gem install pg。我更新了上面的帖子以包含我的 database.yml 文件。我不确定这是否是错误的根源 -
使用与其他项目相同的数据库配置。
标签： ruby-on-rails ruby postgresql sqlite3-ruby