没有ActiveRecord :: Base的连接池 [英] No connection pool for ActiveRecord::Base

问题描述

我正在尝试使用Rails 4.2.6开发应用程序。我正在尝试将postgres用于数据库。服务器启动正常，但是当我尝试加载页面时，它将引发此 ActiveRecord :: Base没有连接池错误。

I'm trying to use rails 4.2.6 to develop an app. I'm trying to use postgres for database. Server starts fine but when I try loading a page it throws this "No connection pool for ActiveRecord::Base" error.

那会是什么？

编辑

pg宝石无法正常工作。在启动服务器之前，我必须先对其进行评论，然后再从我的GemFile中将其取消注释。我意识到我使用的是Ruby 2.3而不是Ruby 2.0（按预期）。我删除了ruby 2.3，并在ruby 2.0环境下设置了所有内容。

The pg gem wasn't working properly. I had to comment it before starting the server and then uncomment it from my GemFile afterwards. I realized that I was using Ruby 2.3 instead of Ruby 2.0 (as intended). I removed ruby 2.3 and set up everything under ruby 2.0 environment. It's now working properly.

我在某个地方读到，在较新的Rails版本中 pg gem存在一些问题，要求人们使用 gem install pg。 pre'代替安装gem。我尝试了一下，但是随后我的应用程序在我的GemFile中要求使用 pg gem，而且，上述问题再次出现。

I had read somewhere that there were some issues with the 'pg' gem in newer Rails releases, requiring people to use 'gem install pg --pre' instead for installing the gem. I tried that, but then my app was requiring the 'pg' gem in my GemFile and, well, the problem stated above showed up again.

这是我的database.yml文件结束的方式：

This is how my database.yml file ended up:

  default: &default
     adapter: postgresql
     encoding: unicode
     host: localhost
     username: -------
     password: -------
     pool: 5

  development:
     <<: *default
     database: myDbName

推荐答案

如果您在rake任务中遇到此错误，则可能是您没有运行 ：environment 任务之前。

If you are experiencing this error from a rake task, chances are you are not running the :environment task before your task.

更改：

task :task_name do
end

至：

task task_name: :environment do
end

应解决此问题。

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