我正在学习RoR,并且我试图找到如何在具有has_one模型的另一个模型中设置fields_for:

class Child < ActiveRecord::Base
    belongs_to :father
    accepts_nested_attributes_for :father
end

class Father < ActiveRecord::Base
    has_one :child
    belongs_to :grandfather
    accepts_nested_attributes_for :grandfather
end


class Grandfather < ActiveRecord::Base
    has_one :father
end


我在Railscasts上使用了嵌套模型表单第1部分来获取这些信息:
在children_controller.rb中:

  def new
    @child = Child.new
    [email protected]_father
    father.build_grandfather
  end

def child_params
      params.require(:child).permit(:name, father_attributes:[:name], grandfather_attributes:[:name])
    end


和我的形式:

<%= form_for(@child) do |f| %>
  <div class="field">
    <%= f.label :name %><br>
    <%= f.text_field :name %>
  </div>
  mother:<br>
  <%= f.fields_for :father do |ff| %>
    <%= ff.label :name %>
    <%= ff.text_field :name %><br>
      grand mother:<br>
      <%= f.fields_for :grandfather do |fff| %>
        <%= fff.label :name %>
        <%= fff.text_field :name %>
      <% end %>
  <% end %>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>


我正在尝试使用以下方法检索数据:

<%= child.father.name %>
<%= child.father.grandfather.name %>


但是祖父的名字不起作用。
我找不到错误...有人可以帮忙吗?
谢谢!

最佳答案

尝试切换:

<%= f.fields_for :grandfather do |fff| %>


至:

<%= ff.fields_for :grandfather do |fff| %>


并切换:

params.require(:child).permit(:name, father_attributes:[:name], grandfather_attributes:[:name])


至:

params.require(:child).permit(:name, father_attributes:[:name, grandfather_attributes:[:name]])

关于ruby-on-rails - Rails 4:fields_for中的fields_for,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/20182019/

10-14 12:31