Could not find the association problem in Rails

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In the ApplicationForm class, you need to specify ApplicationForms’s relationship to ‘form_questions’. It doesn’t know about it yet. Anywhere you use the :through, you need to tell it where to find that record first. Same problem with your other classes.

So

# application_form.rb
class ApplicationForm < ActiveRecord::Base
  has_many :form_questions
  has_many :questions, :through => :form_questions
end

# question.rb
class Question < ActiveRecord::Base
  belongs_to :section
  has_many :form_questions
  has_many :application_forms, :through => :form_questions
end

# form_question.rb
class FormQuestion < ActiveRecord::Base
  belongs_to :question
  belongs_to :application_form
  belongs_to :question_type
  has_many :form_questions_answers
  has_many :answers, :through => :form_question_answers
end

That is assuming that’s how you have it set up.

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