ruby-on-rails - Rails 控制台中的 Postgres 连接过多

Question

我正在使用 postgre gem 开发 Ruby on Rails 应用程序，这就是我的 database.yml 的样子:

development:
 adapter: postgresql
  encoding: utf-8
  pool: 5
  username: "hytxlzju"
  password: "xxxxx"
  host: "jumbo.db.elephantsql.com"
  port: "5432"
  database: "hytxlzju"

production:
  adapter: postgresql
  encoding: utf-8
  pool: 5
  username: "hytxlzju"
  password: "xxxxxx"
  host: "jumbo.db.elephantsql.com"
  port: "5432"
  database: "hytxlzju"

每当我从 rails console 本地连接到这个数据库时，我得到的连接太多了。我如何在代码中终止连接，一旦用户注销，在代码中，以及如何在我的 Rails 控制台中终止连接，在我完成更改表？

[编辑] 这是错误消息:

C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-3.2.22.5/lib/active_record/connection_adapters/postgresql_adapter.rb:12
22:in `initialize': FATAL:  too many connections for role "hytxlzju" (PG::ConnectionBad)

[编辑] 我添加了我的启动器，仍然没有成功:

Rails.application.config.after_initialize do
  ActiveRecord::Base.connection_pool.disconnect!

  ActiveSupport.on_load(:active_record) do
    config = ActiveRecord::Base.configurations[Rails.env] ||
                Rails.application.config.database_configuration[Rails.env]
    config['pool']              = ENV['DB_POOL']      || ENV['RAILS_MAX_THREADS'] || 5
    ActiveRecord::Base.establish_connection(config)
  end
end

Answer 1

你可以试试下面的方法

Active Record limits the total number of connections per application through a database setting pool; this is the maximum size of the connections your app can have to the database

在 config/datbase.yml

pool: <%= ENV['RAILS_MAX_THREADS'] || 5 %>

如果您使用的是 puma，则使用 ENV['RAILS_MAX_THREADS'] more here

它可能会解决问题。