ruby-on-rails - Rails fields_for 里面的 fields_for

Question

我怎样才能实现这样的目标？
结构是 => 一个测试有很多问题，一个问题有很多答案。

我在 Controller 中有 questions = @test.questions.build 和 questions.answers.build。

form_for @test do |f|
  f.fields_for :questions do |question_f|
    question_f.fields_for :answers do |answer_f|
      # answer form here

它一直工作到 fields_for :answers。

我错过了什么？谢谢!

Answer 1

如果您想使用嵌套形式，您还应该将 accepts_nested_attributes_for 放入您的测试和问题模型中:

class Test < ActiveRecord::Base
  attr_accessible :questions_attributes
  has_many :questions, dependent: :destroy
  accepts_nested_attributes_for :questions
end

class Question < ActiveRecord::Base
  attr_accessible :answers_attributes
  has_many :answers, dependent: :destroy
  accepts_nested_attributes_for :answers
end

试试这个:

form_for ([@test, @question]) do |f|

在 Controller 中的新操作中:

@test = Test.new
@question = Question.new
@test.questions.build
@question.answers.build