Rails and rspec. uninitialized constant Errors

Question

I have a rails App. I have this file app/errors/status.rb

I try to pass the test but is not not working.

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

And the test on spec/errors/status_spec.rb:

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

And it keeps throwing this error:

/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'

Your Rails version is ?

Arup Rakshit
– Arup Rakshit

2015-10-31 14:31:36 +00:00
Commented Oct 31, 2015 at 14:31 — Arup Rakshit
– Arup Rakshit, Commented Oct 31, 2015 at 14:31

Andrew Marshall · Accepted Answer · 2015-10-31 14:34:53Z

1

That’s because of how ActiveSupport’s auto-loading works and the way in which Rails sets up the $LOAD_PATH. Autoload sees Errors::Status and expects to find it at errors/status somewhere via require, but it doesn’t because app/errors is in the $LOAD_PATH, so you would require your file with just require 'errors'.

You can fix this by moving app/errors/status.rb to a location ActiveSupport’s auto-loading expects (e.g. app/<something>/errors/status.rb). You can puts $LOAD_ATH to see all the possible locations (note that Rails will add all directories in app/ to the $LOAD_PATH).

answered Oct 31, 2015 at 14:34

Andrew Marshall

97.3k20 gold badges228 silver badges217 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

Arup Rakshit Over a year ago

This answer is good, and more detail discussion .

Arup Rakshit Over a year ago

here is a sweet reasoning

Gerard Morera Over a year ago

@Andrew is there any way to fix it without modifying the tree structure? I am not sure if I still understand the problem. I have other folders at the same level, like services, components, null_object and they do not give any problem...

Andrew Marshall Over a year ago

Nope. Not without making ActiveSupport::Dependencies very angry. Think about it: app/models/foo.rb does not contain Models::Foo, and likewise it expects app/errors/status.rb to contain Status, not Errors::Status.

eToThePiIPower Over a year ago

To expand Andrew's comment, considering that app/models/foo.rb contains FooModel, and and app/controllers/foo.rb contains FooController, you can rename the error class from Errors::Status to StatusError. This maintains consistency with both the Rails class naming scheme and Ruby's error naming scheme.

Collectives™ on Stack Overflow

Rails and rspec. uninitialized constant Errors

1 Answer 1

5 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

5 Comments

Your Answer

Sign up or log in

Post as a guest

Related