Question

我有模特 - 测试，问题和教师答案。

test.rb

class Question < ActiveRecord::Base
  belongs_to :test
  has_many :teacher_answers, dependent: :destroy
  accepts_nested_attributes_for :teacher_answers
end

question.rb

class TeacherAnswer < ActiveRecord::Base
  belongs_to :question
end

teacher_answer.rb

---    
standard scaffold code
---
def test_params
      params.require(:test).permit(:title, 
                                    questions_attributes: [:question_text, :test_id, teacher_answers_attributes: [:teacher_answer_text, :correct, :question_id]],)
    end

和控制器 test_controller.rb

---    
standard scaffold code
---
def question_params
      params.require(:question).permit(:question_text, :test_id,
                                        teacher_answers_attributes: [:teacher_answer_text, :correct, :question_id])
    end

question_controller.rb

`<span class="my_tag">#tag</span>`

使用问题和答案创建新测试时，它会正确创建所有内容，但在更新时：

无法移除问题
保存时不更新问题和答案，但保存新旧问题，即用2个问题更新测试时，保存后会有4个问题。

Answer 1

您应该允许:id :_destroy中的test_params和update允许delete和def test_params params.require(:test).permit(:title, questions_attributes: [:id, :question_text, :test_id, :_destroy, teacher_answers_attributes: [:id, :teacher_answer_text, :correct, :question_id, :_destroy]]) end正常工作。

allow_destroy: true

<强> 更新

您还应为test.rb和question.rb

添加

class Test < ActiveRecord::Base
  has_many :questions, dependent: :destroy
  accepts_nested_attributes_for :questions, allow_destroy: true
end

class Question < ActiveRecord::Base
  belongs_to :test
  has_many :teacher_answers, dependent: :destroy
  accepts_nested_attributes_for :teacher_answers, allow_destroy: true
end

{{1}}

Answer 2

accepted_nested_attributes_for默认情况下不允许删除，请使用delete：true
通过隐藏标记

如何更新嵌套资源Rails 4

2 个答案: