Rails fields_for 参数空白

Question

我正在尝试为调查构建一个嵌套表单，但我的参数散列在 fields_for 块中缺少值时遇到问题。

我有以下型号。该应用程序的工作方式是管理员创建 MiniPost 及其 MiniPostQuestions。然后客户端使用 MiniPosts 之一创建一个新的 MiniPostSurvey。客户端然后通过电子邮件发送 SurveyInvites 给用户。当用户响应时，将创建一个新的 SurveyResponse，并为调查中的每个 MiniPostQuestion 创建一个新的 QuestionAnswer。

class MiniPost < ActiveRecord::Base
    has_many :mini_post_questions
    has_many :question_answers, through: :mini_post_questions
    has_many :mini_post_surveys

    belongs_to :employer

    def questions
        mini_post_questions
    end

    def surveys
        mini_post_surveys
    end
end

class MiniPostQuestion < ActiveRecord::Base
    has_many :question_answers

    belongs_to :mini_post
    belongs_to :employer

    def answers
        question_answers
    end
end

class MiniPostSurvey < ActiveRecord::Base
    belongs_to :mini_post
    belongs_to :employer
    belongs_to :company
    has_many :survey_invites
    has_many :survey_responses, through: :survey_invites

    def questions
        mini_post.questions
    end
end

class SurveyInvite < ActiveRecord::Base
    belongs_to :mini_post_survey
    has_many :survey_responses

    def responses
        survey_responses
    end
end

class SurveyResponse < ActiveRecord::Base
    belongs_to :survey_invite
    has_many :question_answers
    has_many :mini_post_questions, through: :question_answers
end

class QuestionAnswer < ActiveRecord::Base
    belongs_to :survey_response
    belongs_to :mini_post_question
    validates :answer, presence: true
end

这是我的回复表。

<div class="form-box">
    <%= form_for @response, url: "/survey?key=#{@invite.key}", method: :post, html: { role: 'form' } do |f| %>
        <% @questions.each do |question| %>
            <div class="form-group">
                <%= f.fields_for :mini_post_questions, question do |q| %>
                    <%= q.fields_for :question_answers, question.question_answers.build do |a| %>
                        <%= f.label question.question %>
                        <%= a.text_area :answer, class: 'form-control' %>
                        <%= a.hidden_field :survey_response_id, value: @survey.id %>
                    <% end %>
                <% end %>
            </div>
        <% end %>

        <div><%= f.submit "Submit", :class => "btn btn-primary" %></div>
    <% end %>
</div>

我的表单正确呈现，但是当我提交它时，我的参数哈希看起来像这样：

{"utf8"=>"✓",
 "authenticity_token"=>"p8Tky2So10TH4FUUvLKhIh7j2vjNN39b3HDsF0cYE14=",
 "survey_response"=>{"mini_post_questions"=>{"question_answers"=>{"answer"=>"", "survey_response_id"=>"11"}}},
 "commit"=>"Submit",
 "key"=>"e4fab42244db2286d471082696",
 "controller"=>"surveys",
 "action"=>"create"}

我希望每个问题都有一个 mini_post_question 键，但我不确定如何做到这一点。

Answer 1

我认为您的方向是正确的，但您需要让您的模型接受表单中所需对象的嵌套属性。

所以我认为在您的 SurveyResponse 模型中，您会

class SurveyResponse < ActiveRecord::Base
  belongs_to :survey_invite
  has_many :question_answers
  accepts_nested_attributes_for :question_answers
  has_many :mini_post_questions, through: :question_answers
end

此外，由于您似乎没有在此处修改小问题，我想说您不需要接受问题的嵌套属性，而只需有一个隐藏字段分配 mini_question_id 到 question_answer

所以你的表格应该是这样的

<div class="form-box">
  <%= form_for @response, url: "/survey?key=#{@invite.key}", method: :post, html: { role: 'form' } do |f| %>
      <% @questions.each do |question| %>
          <div class="form-group">
              <%= f.fields_for :question_answers, @survey.question_answers.build do |q| %>
                  <%= q.label question.question %>
                  <%= q.text_area :answer, class: 'form-control' %>
                  <%= q.hidden_field :mini_post_question_id, value: question.id %>
              <% end %>
          </div>
      <% end %>

      <div><%= f.submit "Submit", :class => "btn btn-primary" %></div>
  <% end %>
</div>

由于您的表单接受 question_answer 的嵌套属性，因此您无需提供 survey_id。

这应该让您更接近您在表单中需要的内容。

Rails fields_for 参数空白

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