Uninitialized Constant in Rails Controller

Question

I have the following in my controller:

class SurveysController < ApplicationController

  def index
    survey_provider = FluidSurveysProviders::SurveyProvider.new
    contact_lists = survey_provider.get_lists()
    @survey = Survey.new(contact_lists)
  end

And I'm receiving this error:

NameError in SurveysController#index
uninitialized constant SurveysController::FluidSurveysProviders

Excuse my Rails noobiness, I'm sure I'm leaving out something important here. But it seems to me that I am trying to "initialize" the constant with this line:

survey_provider = FluidSurveysProviders::SurveyProvider.new

But that's the same line that's throwing an error because it's not initialized. Where should I be "initializing" the Provider?

Vidya · Answer 1 · 2013-11-06T17:38:12.887

1

Once you require fluid_surveys_providers (or similar) then do this:

include FluidSurveysProviders

edited Nov 06 '13 at 17:38

answered Nov 06 '13 at 17:28

Vidya

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I did not. When I `include FluidSurveysProviders` I get this: `ActionController::RoutingError (uninitialized constant SurveysController::FluidSurveysProviders)` instead of the `NameError` – Luigi Nov 06 '13 at 17:31
Forgot to mention you need to `require` the file too. – Vidya Nov 06 '13 at 17:37

score 0 · Answer 2 · answered Nov 06 '13 at 21:02

Make sure SurveyProvider is wrapped with module FluidSurveysProviders. It may look like this

module FluidSurveysProviders
  class SurveyProvider
    ...
  end
end

if its an ActiveRecord object try this

class FluidSurveysProviders::SurveyProvider < ActiveRecord::Base
  ...
end

score 0 · Answer 3 · edited May 23 '17 at 11:46

The SurveyProvider was not loaded correctly.

For a quick fix, move the class file into app directory, e.g. app/lib/survey_provider.rb. Then all code inside app will be auto-loaded by Rails.
Or make sure the path to class SurveyProvider is included in the autoload_path of Rails. In config/application.rb

config.autoload_paths += %W(#{config.root}/lib) # where lib is directory to survery_provider

If you use Rails 5, be careful that autoload is disabled in production environment. Check this link for more info.

Uninitialized Constant in Rails Controller

3 Answers3