Question

我尝试将现有项目从Rails 3.2.3升级到Rails 4.1.4（最新版本）。我更新了我的gemfile并且没有更新捆绑包的问题。我还添加了

config.eager_load = false

到我的环境* .rb。当我运行服务器时，当我尝试访问第一页时出现以下错误...它看起来像没有连接到数据库但我可以使用客户端来访问它。我的服务目前使用的是sqlite3 ..

的ActiveRecord :: ConnectionNotEstablished （ActiveRecord的:: ConnectionNotEstablished）： activerecord（4.1.4）lib / active_record / connection_adapters / abstract / connection_pool.rb:541:in retrieve_connection' activerecord (4.1.4) lib/active_record/connection_handling.rb:113:in retrieve_connection” activerecord（4.1.4）lib / active_record / connection_handling.rb:87:in connection' activerecord (4.1.4) lib/active_record/query_cache.rb:51:in restore_query_cache_settings' activerecord（4.1.4）lib / active_record / query_cache.rb:43:in rescue in call' activerecord (4.1.4) lib/active_record/query_cache.rb:32:in call' activerecord（4.1.4）lib / active_record / connection_adapters / abstract / connection_pool.rb:621:in call' actionpack (4.1.4) lib/action_dispatch/middleware/callbacks.rb:29:in阻止通话' activesupport（4.1.4）lib / active_support / callbacks.rb：82：在`run_callbacks'（1.5.2）li

b / rack / runtime.rb：17：在`call'中 ...

我的database.yml文件没有改变。它使用sqlite3

# SQLite version 3.x
#   gem install sqlite3
#
#   Ensure the SQLite 3 gem is defined in your Gemfile
#   gem 'sqlite3'
development:
  adapter: sqlite3
  database: db/development.sqlite3
  pool: 5
  timeout: 5000

# 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:
  adapter: sqlite3
  database: db/test.sqlite3
  pool: 5
  timeout: 5000

production:
  adapter: sqlite3
  database: db/production.sqlite3
  pool: 5
  timeout: 5000

Answer 1

事实证明，当从3.2迁移到4.0时，应用配置文件会有很多变化。您可以在下面的链接中看到详细信息，我能够使用postgres而不是sqlite解决问题，并运行链接建议的命令

rake rails:update

Upgrading to rails 4.0 from 3.2

升级到时，ActiveRecord :: ConnectionNotEstablished错误

1 个答案: