ruby-on-rails - railsfields_for渲染具有多个局部变量的局部变量，产生 undefined variable

Question

全部，

我在使用标准fields_for安装程序时遇到问题。在我的“_form”部分中，我有:

<div class="comment_list">
  <%= f.fields_for :comments do |cf| %>
    <%= render :partial => 'comments/comment_fields', :locals => {:f => cf, :tester => true} %>
  <% end %>

  <%= link_to_add_fields "Add a comment", f, :comments %>
</div>

在“_comment_fields”部分中，我具有通常的字段，然后是测试变量:

<%= tester.to_s %>

当我删除测试器变量时，一切正常。一旦添加测试变量，就会出现此错误:

ActionView::Template::Error (undefined local variable or method `tester' for #Class:0xa1f3664>:0xa1f1bd4>)

在多个字段中使用fields_for时，还有其他人遇到过此问题吗？

为了进一步说明，我的“_comment_fields”部分看起来像这样:

<div class="comment dynamic_field">
  <span class="comment_content"><%= f.text_field :content, :class => "comment_content" %></span>
  <%= tester.to_s %>
  <%= link_to_remove_fields "remove", f %>
</div>

仅从“_form”部分调用。

Answer 1

全部，

Hakunin赚了钱。我在多个地方都叫局部。第二点是在我的助手方法“link_to_add_fields”中。我使用它来使用javascript添加字段。

该方法如下所示:

# generates add fields on a dynamic form
def link_to_add_fields(name, f, association, locals={})  
  new_object = f.object.class.reflect_on_association(association).klass.new  
  fields = f.fields_for(association, new_object, 
                      :child_index => "new_#{association}") do |builder|  
    render(association.to_s.singularize + "_fields", :f => builder)  
  end  

  link_to(name, "#", :class => "dynamic_add", 'data-association' => "#{association}",
                                            'data-content' => "#{fields}")
end  

请注意，这不允许将任何本地变量传递给render方法。我将其更改为:

# generates add fields on a dynamic form
def link_to_add_fields(name, f, association, locals={})  
  new_object = f.object.class.reflect_on_association(association).klass.new  
  fields = f.fields_for(association, new_object, 
                      :child_index => "new_#{association}") do |builder|  
    render(association.to_s.singularize + "_fields", locals.merge!(:f => builder))  
  end  

  link_to(name, "#", :class => "dynamic_add", 'data-association' => "#{association}",
                                            'data-content' => "#{fields}")
end  

现在，我的_form部分中的link_to_add_fields调用如下所示:

<%= link_to_add_fields "Add a comment", f, :comments, :tester => true %>

...然后我可以将字段动态添加到表单中，并传递其他本地变量。希望这会帮助其他人。