深嵌套 Rails 4 形式 [英] Deep Nested Rails 4 Form
问题描述
我有 3 个模型项,它们接受问题的嵌套属性,而问题接受答案的嵌套属性.我正在尝试创建一个具有相同形式的问题和答案的项目.
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], :answers_attributes => [:content, :correct])
end
end
_form.haml
= simple_form_for(@item) do |f|
= f.input :kind
= f.input :content
= f.simple_fields_for :questions do |q|
= q.input :content
= q.simple_fields_for :answers do |a|
= a.input :content
= f.submit
表单正确显示并且它正确保存了问题模型.不过,我似乎无法保存答案.
我已经查看了很多在线帮助,但没有一个包含 Rails 4 强参数.
I've already looked at a lot of online help but none are covering it with Rails 4 strong params.
推荐答案
我认为你的问题在于你的强参数:
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
基本上,当您传递深层嵌套表单(其中有多个依赖模型)时,您必须将属性作为其他模型属性的一部分进行传递.你有单独的参数
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
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