Rspec-rails: #<:examplegroups:: i="4"/> 的未定义方法`get'

在测试我的控制器时，我遇到了这个问题。 我正在使用 rspec-rails-3.4.2、rails-4.2.0 和 mongodb。 这是我的 rails_helper.rb

`ENV['RAILS_ENV'] ||= 'test'

require File.expand_path('../../config/environment', __FILE__)

abort("The Rails environment is running in production mode!") if Rails.env.production?

require 'spec_helper'
require 'rspec/core'
require 'rspec/rails/extensions'
require 'rspec/rails/view_rendering'
require 'rspec/rails/adapters'
require 'rspec/rails/matchers'
require 'rspec/rails/fixture_support'
require 'rspec/rails/example'
require 'rspec/rails/vendor/capybara'
require 'mongoid-rspec'

RSpec.configure do |config|
  config.before(:suite) do
    DatabaseCleaner.orm = "mongoid"
    DatabaseCleaner.strategy = :truncation
  end
  config.before(:each) do
    DatabaseCleaner.start
  end
  config.after(:each) do
    DatabaseCleaner.clean
  end
end