Deep Nested Rails 4 Form

Question

I have 3 models Item which accepts nested attributes for questions and questions accept nested attributes for answers. I'm trying to create an item which has a question and an answer in the same form. item.rb ``` class Item < ActiveRecord::Base has_many :questions, dependent: :destroy accepts_nested_attributes_for :questions end ``` question.rb ``` class Question < ActiveRecord::Base belongs_to :item has_many :answers, dependent: :destroy accepts_nested_attributes_for :answers end ``` answer.rb ``` class Answer < ActiveRecord::Base belongs_to :question end ``` item_controller.rb ``` class ItemsController < ApplicationController def new @item = @repository.items.new questions = @item.questions.build answers = questions.answers.build end def create @item = Item.new(item_params) if @item.save redirect_to @item, notice: '...' else render action: 'new' end end private def item_params params.require(:item).permit(:id, :content, :kind, :questions_attributes => [:content, :helper_text, :kind]…

Accepted Answer

I think your problem is with your strong params:

```
def item_params
      params.require(:item).permit(:id, :content, :kind, questions_attributes: [:content, :helper_text, :kind, answers_attributes: [:content, :correct]])
end   
```

Basically, when you pass a deep nested form (where you have multiple dependent models), you'll have to pass the attributes as part of the other model's attributes. You had the params as separate

Deep Nested Rails 4 Form

Solution

Problem