在rails上的create controller ruby​​中传递新对象ID

Question

I'm hoping this is easy.... =)

I've got a question object, and a favanswer object, question has_one favanswer, favanswer belongs_to question. I've got a favanswer_id column and index in my question model, I'm trying to pass the newly posted favanswer_id to the corresponding question objects' favanswer_id field. Maybe it's a lot more..or less..complicated than this,.but in the favanswer_controller I have the below in the create action, and I'm just trying to figure out how to correct line 6, or whatever I need to do, because without 6 it works fine, it just doesn't update my question model...Help?

  1 def create
  2
  3  @answer = Answer.find(params[:answer_id])
  4  @question = @answer.question_id
  5  Favanswer.create(favanswer_params.merge(user: current_user, question_id: @question))
  6  Question.update(@question, :favanswer_id => "HOW DO I PASS THE NEW FAVANSWER ID HERE?")
  7  redirect_to question_path(@question)
  8
  9 end

Answer 1

I think the mistake you're making here is referring to the foreign key of the association directly. Instead, rely on the association as an object. When you create the Favanswer , pass in the @answer.question object and not the id. Additionally, don't pass it in to question_id but rather to question

def create
  @answer = Answer.find(params[:answer_id])
  @question = @answer.question
  Favanswer.create(favanswer_params.merge(user: current_user, question:     @question))
  redirect_to question_path(@question)
end

Rails is friendly and kind and when you assign the Question instance to the named association, it will hook it up as required, so you have no need to update the Question directly.

Answer 2

Model.create returns an instance of the newly created Model, which is useful for what you're trying to do. That means:

@favanswer = Favanswer.create(favanswer_params.merge(user: current_user, question_id: @question))
Question.update(@question, :favanswer_id => @favanswer.id)

Will accomplish what you're after.

Answer 3

smh...

figured it out =)

@L = Favanswer.create(favanswer_params.merge(user: current_user, question_id:    @question))
Question.update(@question, :favanswer_id => @L.id)