Question

我有一个跟踪has_many测验和测验has_many问题。

quiz.rb：

class Quiz < ActiveRecord::Base
  belongs_to :track
  has_many :questions, dependent: :destroy
  accepts_nested_attributes_for :questions
end

question.rb：

class Question < ActiveRecord::Base
  belongs_to :quiz
end

quizzes_controller.rb：

def new
  @quiz = Quiz.new
  @track = Track.find(params[:permalink])
  @course = Course.find(@track.course_id)

  3.times { @quiz.questions.build }
end

def create
  @track = Track.find(params[:permalink])
  @quiz = @track.quizzes.build(quiz_params)
  @course = Course.find(@track.course_id)
  if @quiz.save
    flash[:success] = 'Quiz successfully created'
    redirect_to quiz_path @quiz
  else
    redirect_to track_path @track
  end
end

private

def quiz_params
  params.require(:quiz).permit(:name, :information, :order, 
                               :permalink, :user_id,
                               questions_attributes: [:id, :content])
end

提交上的参数：

{"utf8"=>"✓",
 "authenticity_token"=>"...",
 "quiz"=> {
   "name"=>"Test Quiz",
   "questions_attributes"=> {
     "0"=>{"content"=>"This is question 1?"},
     "1"=>{"content"=>"This is question 2?"},
     "2"=>{"content"=>""}
   }, "user_id"=>"1",
   "order"=>"3"
 }, "commit"=>"Submit",
 "permalink"=>"1-basics"}

当我按提交时，会创建测验，但不会创建问题。

新的参数：

def quiz_params
    params.require(:quiz).permit(:name, :information, :order, 
                                 :permalink, :user_id, 
                                 questions_attributes: [:id, :content, :_destroy, answers_attributes: [:id, :content, :_destroy]] )
  end

Answer 1

我认为问题出在accepts_nested_attributes_for：

reject_if: proc { |q| q['name'].blank? }

如果content为空（考虑请求参数），您可能应该拒绝实例：

reject_if: proc { |q| q['content'].blank? }

Answer 2

问题解决了。嵌套参数需要用大括号括起来：

def quiz_params
  params.require(:quiz).permit(:name, :information, :order, 
                               :permalink, :user_id,
                               { questions_attributes: [:id, :content] })
end

accepts_nested_attributes_for不创建嵌套资源？

2 个答案: