Rails, 简单表格, 嵌套表格

Question

class Project
  has_many :project_questions, dependent: :destroy#, through: :projects
  accepts_nested_attributes_for :project_questions
end

我正在尝试使用 rails 4 和 Simple Form 制作一个应用程序。

我有名为项目的模型，project_questions 和 project_answers。

它们之间的关联是：

项目：

has_many :project_questions, dependent: :destroy#, through: :projects
accepts_nested_attributes_for :project_questions

项目问题：

belongs_to :project#, counter_cache: true
has_many :project_answers, dependent: :destroy
belongs_to :user
accepts_nested_attributes_for :project_answers
belongs_to :user

项目答案：

belongs_to :project_question#, counter_cache: true
belongs_to :user

用户：

has_many :project_questions
has_many :project_answers

class ProjectQuestions
  belongs_to :project#, counter_cache: true
  has_many :project_answers, dependent: :destroy
  belongs_to :user
  accepts_nested_attributes_for :project_answers
end

项目答案：

belongs_to :project_question#, counter_cache: true
belongs_to :user

我的 objective 是在我的项目显示页面上有一个部分，它显示与项目相关的问题和他们的答案，并有一个 link 到另一个你可以提问的表格或回答一个。我在挣扎。

在我的控制器中我有：

项目：

def project_params
  params.require(:project).permit(project_question_attributes: [:title, :content, :user_id, :project_id,project_answer_attributes: [:answer, :project_question_id]],

Project_question:

def new
  @project_question = ProjectQuestion.new
  @project_id = params[:project_id]
  @project_question.project_answers[0] = ProjectAnswer.new
end

Project_answer:

def new
  @project_answer = ProjectAnswer.new
end

def project_question_params
    params[:project_question].permit(:id, :title, :content, :project_id,   :user_id,project_answer_atttibutes: [:id, :answer, :project_question_id, :user_id])
end

那么在我看来我有：

项目#show:

<% if current_user.id ==  @project.creator_id %>
    <%= link_to 'Ask a question', new_project_project_question_path(:project_id => @project.id) %> 
  <% end %>

  <%= render 'project_questions/pqps' %>

Project_question#pqps（部分）：

<div class="containerfluid">
  <div class="row">
    <div class="col-md-10 col-md-offset-1">
          <div class="categorytitle">
            <%= @project_question.try(:title) %>
          </div>
          <div class="generaltext">
            <%= @project_question.try(:content) %>
          </div>
          <span class="editproject">   
              <% if current_user.id == @project.creator_id %>
              <% end %>
          </span>
    </div>
  </div>
</div>

我的 project_questions 表格部分是：

<div class="containerfluid">
  <div class="row">
    <div class="col-md-10 col-md-offset-1">
          <% f.simple_fields_for :project_questions do |f| %>
              <%= f.input :project_id, as: :hidden, input_html: {value: @project_question_id} %>
              <%= f.input :title, label: 'Question:', :label_html => {:class => 'categorytitle'}, placeholder: 'Type your question here', :input_html => {:style => 'width: 100%', class: 'categorytitle'} %>
              <%= f.input :content, label: 'Is there any context or other information?', :label_html => {:class => 'categorytitle'}, placeholder: 'Context might help to answer your question', :input_html => {:style => 'width: 100%', rows: 5, class: 'generalprojecttext'} %>
              <%= f.button :submit %>   
           <% end %>
    </div>
  </div>
</div>

Project_answer#pa（部分）：

(not yet written - still trying to get the questions to work)

我的路线是：

resources :projects do
    resources :project_questions do
      resources :project_answers
    end
end

当我尝试此操作时，我在 project_questions 表单中收到一条错误消息：undefined local variable or methodf' for #<#:0x000001013d8298>`

我看不到它在表单块外的什么地方谈论 f。我尝试在项目的 simple_fields 表单中添加另一行，然后在其中嵌套项目问题表单，但这并没有改变任何东西。

谁能看出我做错了什么？

谢谢

Answer 1

plataformatec simple_form wiki 有一个很好的 instructional page on using nested forms。

（作为旁注，我发现不使用局部变量通常更容易诊断问题。一旦一切正常，您可以通过重构为局部变量来清理。）

我相信你需要将一个局部变量传递给你的局部变量，所以它知道第一个 "f" 指的是什么。

<%= render 'project_questions/pqps', locals: {f: f} %>

（您也可以选择在 project_questions 的局部变量中使用不同的局部变量，这样您就可以始终清楚错误消息中引用的内容。）

Answer 2

您应该将这一行 <% f.simple_fields_for :project_questions do |f| %> 更改为这一行 <%= simple_form_for :project_questions do |f| %> 以使其正常工作。

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