Rake db：使用错误未定义方法`session_store_host`迁移rails

Question

我有多个跨地理位置的数据库。在我的 database.yml 文件中，每个都有自己的表示形式。

运行RAILS_ENV=europe rake db:migrate 时出现以下错误

undefined method `session_store_host' for #<Rails::Application::Configuration:0x000000038fdda8>

堆栈：

/usr/local/rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.17/lib/rails/railtie/configuration.rb:85:in `method_missing'
/var/www/vhosts/adm.dyqa.io/html/releases/20190324134144/config/initializers/session_store.rb:9:in `<top (required)>'
/usr/local/rvm/gems/ruby-1.9.3-p327/gems/activesupport-3.2.17/lib/active_support/dependencies.rb:245:in `load'
/usr/local/rvm/gems/ruby-1.9.3-p327/gems/activesupport-3.2.17/lib/active_support/dependencies.rb:245:in `block in load'
/usr/local/rvm/gems/ruby-1.9.3-p327/gems/activesupport-3.2.17/lib/active_support/dependencies.rb:236:in `load_dependency'
/usr/local/rvm/gems/ruby-1.9.3-p327/gems/activesupport-3.2.17/lib/active_support/dependencies.rb:245:in `load'

我的数据库文件：

europe:
  adapter: mysql2
  encoding: utf8
  reconnect: true
  database: production
  pool: 10
  username: USERNAME
  password: PASSWORD
  host: database.mycompany.europe
  port: 1234

danger:
  adapter: mysql2
  encoding: utf8
  reconnect: true
  database: production
  pool: 10
  username: USERNAME
  password: PASSWORD
  host: database.mycompany.usa
  port: 1234

Answer 1

原来我错过了配置文件europe.rb 创建后，迁移成功运行。