accepts_nested_attributes_for rails 4 没有删除 [英] accepts_nested_attributes_for rails 4 is not deleting

问题描述

我已经阅读和研究了大约 3 天了.这是我最后的手段.

land.rb:

has_many :uploads , :dependent =>:破坏accepts_nested_attributes_for :uploads, :allow_destroy =>真，:reject_if =>:all_blank

上传.rb

belongs_to :land

_land_form_partial.html.erb

<%= form_for land , :html =>{:multipart =>真} 做 |f|％＞<%= f.fields_for :uploads do |builder|％＞<div class="land_fields"><%= builder.label :filename, "Image" %><%= builder.text_field :filename %><br/>删除:<%= builder.check_box :_destroy %>

<%结束%>#... 按钮和其他字段<%结束%>

lands_controller.rb

def 更新如果@land.update_attributes(land_params)flash[:success] = "土地更新"重定向到lands_path别的flash[:alert] = @land.errors.full_messages.first重定向到 edit_land_path结尾结尾定义土地参数params.require(:land).permit(uploads_attributes: [:id, :filename])结尾

当我向文本字段添加内容并更新它时，所有内容都会正确更新.如果我单击复选框，它不会删除该字段.

有人可以解释一下吗?

我也尝试了 awesome_nested_fields 仍然一切正常，除了删除实际记录.

先谢谢你.

解决方案:(我喜欢将解决方案放在问题中，以防有人想在移动设备上查看它，因为我讨厌我无法立即看到解决方案)

感谢@nTraum

def land_paramsparams.require(:land).permit(uploads_attributes: [:id,:filename,:_destroy])结尾

一切都会好起来的 :)

解决方案

您还需要为嵌套模型允许 :_destroy 参数，因为在您选中删除"时会用到它表单中的复选框.这是 Rails 标记必须销毁的模型实例的方式.

def land_paramsparams.require(:land).permit(uploads_attributes: [:id,:filename,:_destroy])结尾

I have been reading and researching for about 3 days now. This is my last resort.

land.rb:

has_many :uploads , :dependent => :destroy
accepts_nested_attributes_for :uploads, :allow_destroy => true,:reject_if => :all_blank

upload.rb

belongs_to :land

_land_form_partial.html.erb

<%= form_for land , :html => {:multipart => true} do |f| %>

    <%= f.fields_for :uploads do |builder| %>
        <div class="land_fields">
            <%= builder.label :filename, "Image" %>
            <%= builder.text_field :filename %>   <br/>
            Delete: <%= builder.check_box :_destroy %>
        </div>
    <% end %>
 #... buttons and other fields
<% end %>

lands_controller.rb

def update
    if @land.update_attributes(land_params)
      flash[:success] = "Land updated"
      redirect_to lands_path
    else
      flash[:alert] = @land.errors.full_messages.first
      redirect_to edit_land_path
    end
  end

 def land_params  
    params.require(:land).permit( uploads_attributes: [ :id, :filename ]  )
  end

When I add something to the text field and update it, all updates properly. If I click on the check-box it won't remove the field.

Can someone please shed a light on this?

Also I tried awesome_nested_fields still everything works except for removing the actual record.

thank you in advance.

EDIT: Solution: (I like to put the solution in the question in case someone wants to view it on mobile as I hate when I can't see the solution straight away)

Thanks to @nTraum

def land_params  
    params.require(:land).permit( uploads_attributes: [ :id, :filename, :_destroy ]  )
end

And all will be dandy :)

解决方案

You need to allow the :_destroy parameter for your nested model as well, as this gets used when you check the 'Delete' checkbox in the form. It's Rails' way of flagging model instances that have to be destroyed.

def land_params  
  params.require(:land).permit(uploads_attributes: [:id, :filename, :_destroy])
end

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