使用 Accepts_nested_form_for 创建调查

Question

我一直在使用rails3，并一直在尝试创建一个简单的调查应用程序，但出现了一些问题。我可以很好地提出问题，但在创建人们可以参加的调查时，我遇到了一些问题。其一，答案没有被分配：user_id 或：survey_id。以下是我的控制器、模型和视图的副本。

调查控制器

def take
  @survey = Survey.find(params[:id])
  @questions = @survey.questions
  @answers = @questions.map{|q| q.answers.build}
  @answers.each do |a|
    a.survey_id = @survey.id
    a.user_id = current_user.id
  end

  respond_to do |format|
    format.html #
  end
end

def submit
  @survey = Survey.find(params[:id])

  respond_to do |format|
    if @survey.update_attributes(params[:survey])
      format.html { redirect_to(@survey, :notice => 'Survey was successfully submitted.')}
      format.xml  { head :ok }
    else
      format.html { render :action => "edit" }
      format.xml  { render :xml => @survey.errors, :status => :unprocessable_entity }
    end
  end
end

调查模型

class Survey < ActiveRecord::Base
  belongs_to :user
  has_many :questions, :dependent => :destroy
  has_many :answers, :through => :questions, :dependent => :destroy
  validates_presence_of :name, :user_id
  accepts_nested_attributes_for :questions, :allow_destroy => true
end

问题 模型

    class Question < ActiveRecord::Base
     belongs_to :survey
     has_many :answers
     validates_presence_of :question_string, :question_type
     accepts_nested_attributes_for :answers, :allow_destroy => true
    end

答案 模型

    class Answer < ActiveRecord::Base
     belongs_to :question
     belongs_to :user
     belongs_to :survey
    end

查看

    %h1 Take the survey
    - semantic_form_for @survey, :url => { :action => "submit" } do |s|
     - if @survey.errors.any?
        %p= pluralize(@survey.errors.count, "error") + " prohibited this survey from being saved"
        #survey_errors
         - @survey.errors.full_messages.each do |err_msg|
            %p= err_msg
     #survey_details.header
     = s.fields_for :questions do |q|
        = q.fields_for :answers do |a|
         = render 'answer_fields', :s => a

     .actions
        = s.commit_button

问题 部分

    #questions_form.fields
     = s.input :question_string, :label => "Question: "
     = s.input :question_type, :as => :radio, :collection => [1,2,3,4], :label => "Question Type:"
     = s.hidden_field :_destroy
     = link_to_function  "Remove Question", "remove_fields(this)"

答案 部分

    #answers_form.fields
     = s.label :answer_string, "Answer"
     = s.text_field :answer_string
     = s.hidden_field :question_id

Routes.rb

    resources :surveys do
        get 'take', :on => :member
        put 'submit', :on => :member
    end

Answer 1

尝试在您的答案部分中添加另一个带有用户 ID 的隐藏字段。

s.hidden_field :user_id, :value => x

这就是我完成隐藏字段的方式，您只需将变量放在那里即可。我遇到了合并问题，因为没有将其作为键值对传递。

---

你用什么？ HAML，我真的不明白这是如何运作的。

这就是一切正常运行所需的全部。

调查模型

has_many :answers
accepts_nested_attributes_for :answers, :allow_destroy => true

控制器不需要额外的代码

视图需要fields_for

 <% f.fields for :answers do |f| %>
     <%= f.hidden_field :user_id, :value => current_user.id %>
 <% end %>