ruby-on-rails - Rails和rspec。未初始化的常量错误

我有一个Rails应用程序。我有这个文件app / errors / status.rb

我尝试通过测试，但无法正常工作。

module Errors
  class Status
    def initialize status
      @status = status
    end

    def default_message
      "Error in the server status: #{status}"
    end

    private

    attr_reader :status
  end
end

以及对spec / errors / status_spec.rb的测试：

require 'rails_helper'

describe Errors::Status do
  let(:status) { double 'status' }

  subject { described_class.new status }

  describe 'default_message' do
    it 'returns the default message' do
      expect(subject.call).to eq( "Error in the server status: #{status}")
    end
  end
end

并且不断抛出此错误：

/Users/gerardmorera/bet_play/spec/errors/status_spec.rb:3:in `<top (required)>': uninitialized constant Errors (NameError)
    from /Users/gerardmorera/.rvm/rubies/ruby-2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.3.2/lib/rspec/core/configuration.rb:1327:in `load'
    from /Users/gerardmorera/.rvm/rubies/ruby-2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.3.2/lib/rspec/core/configuration.rb:1327:in `block in load_spec_files'
    from /Users/gerardmorera/.rvm/rubies/ruby-2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.3.2/lib/rspec/core/configuration.rb:1325:in `each'
    from /Users/gerardmorera/.rvm/rubies/ruby-2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.3.2/lib/rspec/core/configuration.rb:1325:in `load_spec_files'
    from /Users/gerardmorera/.rvm/rubies/ruby-2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.3.2/lib/rspec/core/runner.rb:102:in `setup'
    from /Users/gerardmorera/.rvm/rubies/ruby-2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.3.2/lib/rspec/core/runner.rb:88:in `run'

最佳答案

这是因为ActiveSupport的自动加载方式以及Rails设置$LOAD_PATH的方式。自动加载会看到Errors::Status并希望通过errors/status在require的某个位置找到它，但这不是因为app/errors位于$LOAD_PATH中，因此您只需要文件require 'errors'。

您可以通过将app/errors/status.rb移至ActiveSupport预期自动加载的位置（例如app/<something>/errors/status.rb）来解决此问题。您可以puts $LOAD_ATH查看所有可能的位置（请注意，Rails会将app/中的所有目录添加到$LOAD_PATH中）。

关于ruby-on-rails - Rails和rspec。未初始化的常量错误，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/33452678/