Rails Engine + Mongoid：找不到名为“default”的会话的配置

我创建了一个 Rails Mountable 应用程序并添加了“mongoid”和“rspec”gem。如果我现在尝试运行我的规范，我会收到以下错误：

Mongoid::Errors::NoSessionConfig: 
Problem:
  No configuration could be found for a session named 'default'.
Summary:
  When attempting to create the new session, Mongoid could not find a session configuration for the name: 'default'. This is necessary in order to know the host, port, and options needed to connect.
Resolution:
  Double check your mongoid.yml to make sure under the sessions key that a configuration exists for 'default'. If you have set the configuration programatically, ensure that 'default' exists in the configuration hash.

当我添加Mongoid.load!(Rails.root.join("config", "mongoid.yml"))线路到spec_helper.rb一切正常。

这是为什么？如何获得像普通 Rails 应用程序一样的功能，而无需调用加载函数？

mongoid.yml

development:
  sessions:
    default:
      database: dummy_development
      hosts:
        - localhost:27017
      options:
  options:
test:
  sessions:
    default:
      database: dummy_test
      hosts:
        - localhost:27017
      options:
        consistency: :strong
        max_retries: 1
        retry_interval: 0

版本：

gem 'rails', '~> 3.2.12'
gem 'mongoid', '~> 3.1'
gem 'rspec-rails', '~> 2.13'

你可能错过了require 'rails/mongoid'在您的spec_helper.rb 文件中。

这里有人遇到同样的问题https://github.com/mongoid/mongoid/issues/2894#issuecomment-14903927 https://github.com/mongoid/mongoid/issues/2894#issuecomment-14903927

尝试添加该要求，应该可以修复它。