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/