如何停止安装 sqlite3 适配器：服务器上的“gem install activerecord-sqlite3-adapter”答案

【问题标题】：how to stop the install the sqlite3 adapter: `gem install activerecord-sqlite3-adapter` on the server如何停止安装 sqlite3 适配器：服务器上的“gem install activerecord-sqlite3-adapter”
【发布时间】：2016-11-17 23:08:44
【问题描述】：

我正在生产模式下部署应用程序，但是当我尝试完成该过程时，客场显示需要 sqlite 适配器，请有人知道如何阻止此问题？

我一直在使用 RAILS_ENV=production，但在这种情况下不起作用。

current$ rails generate admin_interface:setup RAILS_ENV=production
DEPRECATION WARNING: Support for Rails < 4.1.0 will be dropped. (called from warn at /home/ubuntu/.rbenv/versions/2.2.2/lib/ruby/2.2.0/forwardable.rb:183)
/home/ubuntu/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/bundler-1.12.5/lib/bundler/rubygems_integration.rb:322:in `block in replace_gem': Please install the sqlite3 adapter: `gem install activerecord-sqlite3-adapter` (sqlite3 is not part of the bundle. Add it to Gemfile.) (LoadError)
    from /home/ubuntu/vitrineonline/releases/10/vendor/bundle/ruby/2.2.0/gems/activerecord-3.2.22/lib/active_record/connection_adapters/sqlite3_adapter.rb:3:in `<top (required)>'
    from /home/ubuntu/vitrineonline/releases/10/vendor/bundle/ruby/2.2.0/gems/backports-3.6.8/lib/backports/std_lib.rb:9:in `require'
    from /home/ubuntu/vitrineonline/releases/10/vendor/bundle/ruby/2.2.0/gems/backports-3.6.8/lib/backports/std_lib.rb:9:in `require_with_backports'
    from /home/ubuntu/vitrineonline/releases/10/vendor/bundle/ruby/2.2.0/gems/activesupport-3.2.22/lib/active_support/dependencies.rb:251:in `block in require'
    from /home/ubuntu/vitrineonline/releases/10/vendor/bundle/ruby/2.2.0/gems/activesupport-3.2.22/lib/active_support/dependencies.rb:236:in `load_dependency'
    from /home/ubuntu/vitrineonline/releases/10/vendor/bundle/ruby/2.2.0/gems/activesupport-3.2.22/lib/active_support/dependencies.rb:251:in `require'
    from /home/ubuntu/vitrineonline/releases/10/vendor/bundle/ruby/2.2.0/gems/activerecord-3.2.22/lib/active_record/connection_adapters/abstract/connection_specification.rb:50:in `resolve_hash_connection'

【问题讨论】：

标签： ruby-on-rails ruby ruby-on-rails-3 ruby-on-rails-4 amazon-ec2

【解决方案1】：

我看到的第一个问题是您应该将 RAILS_ENV 声明放在命令的开头，因为这会为命令的生命周期设置该变量。

RAILS_ENV=production bundle exec rails generate admin_interface:setup

这可能完全是根本原因。（还要注意使用bundle exec 以确保Gemfile 中指定的gemset 被正确加载）

如果你想为 shell 设置它，运行：

export RAILS_ENV=production

因此您不必为每个命令手动设置它。

第二种可能是数据库适配器配置不正确。如果这是一个 Ruby on Rails 应用程序，则数据库适配器在 config/database.yml 中定义。如果未指定，它可能默认为 sqlite3。确保您有正确设置的 database.yml 文件。

production:
  adapter: postgresql
  database: rails4_stack
  username: myusername
  password: mypassword
  pool: 5
  timeout: 5000
  encoding: utf8
  reconnect: false

【讨论】：