CODEWITHSUNDEEP
ruby-on-rails-4activerecordnested-attributeshas-many-through
rohan kharvi
rohan kharvi

Reputation: 118

passing parameter in has_many through association

I have a class Test, Question, Testquestion associated by has_many through

class Test
  has_many :testquestions
  has_many :questions, through: :testquestions
end

class Question
  has_many :testquestions
  has_many :tests, through: :testquestions
end

class Testquestion
  belongs_to :test
  belongs_to :questions
end

While creating a Test i want to pass a value of column order of Testquestion.

def create
   Test.create(test_params)
end

def test_params
  params.require(:test).permit(:testname,question_attributes:[:questionname])
end

How should i pass value of order column so that associated model(Testquestion) get updated.

Upvotes: 1

Views: 742

Answers (1)

Almaron
Almaron

Reputation: 4147

There's no way to do it that way, you will need to take a longer path.

  1. Don't forget to add accepts_nested_attributes_for to your assossiations, so that nested operations would actualy work.
  2. Check that you have added accepts_nested_attributes_for :question to Testquestion.
  3. Get your params structured right.

Something like this:

{
  test: {
    testname: 'someName',
    testquestion_attributes: {
      order: someOrder,
      question_attributes: {
        questionname: 'someName'
      }
    }
  }
}
  1. Require your params.

params.require(:test).permit(:testname, testquestion_params: [:id, :order, :_destroy, question_params: [:id, :questionname])

p.s. sidenote: you should really aquire a habbit of naming your fields and variables in snake_case and your classes in CamelCase.

Upvotes: 2

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