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我的应用程序的这一部分负责为拥有一个的连锁店(如 H&M)创建 Webshop 模型。如果该连锁店的网站也是网店,它会创建一个网店模型。

如果该网站不是网上商店,那么它就让它在链模型中的字符串。

问题:我正在使用复选框和虚拟属性执行此操作。因此,当向链控制器发送请求时,复选框会设置值“set_webshop”。

# Chain Model

class Chain
 has_one :webshop, :dependent => :destroy

 def set_webshop
  self.webshop.url == self.website unless self.webshop.blank?
 end

 def set_webshop=(value)
   if self.webshop.blank?
    value == "1" ? self.create_webshop(:url => self.website) : nil
   else
    value == "1" ? nil : self.webshop.destroy
   end
 end
end

# Chain Controller

class ChainsController < ApplicationController
  def create
    @chain = Chain.new(params[:chain])

    respond_to do |format|
      if @chain.save
        flash[:notice] = 'Chain was successfully created.'
        format.html { redirect_to(@chain) }
        format.xml  { render :xml => @chain, :status => :created, :location => @chain }
      else
        format.html { render :action => "new" }
        format.xml  { render :xml => @chain.errors, :status => :unprocessable_entity }
      end
    end
  end

  def update
    params[:chain][:brand_ids] ||= []
    @chain = Chain.find(params[:id])

    respond_to do |format|
      if @chain.update_attributes(params[:chain])
        flash[:notice] = 'Chain was successfully updated.'
        format.html { redirect_to(@chain) }
        format.js
      else
        format.html { render :action => "edit" }
      end
    end
  end
end

更新链模型时一切正常,但创建新模型时不行?我想不通为什么?

这是 POST 和 PUT 请求。

# POST (Doesn't work - does not create a Webshop)
Processing ChainsController#create (for 127.0.0.1 at 2010-02-06 11:01:52) [POST]
  Parameters: {"commit"=>"Create", "chain"=>{"name"=>"H&M", "set_webshop"=>"1", "website"=>"http://www.hm.com", "desc"=>"...", "email"=>"info@hm.com"}, "authenticity_token"=>"[HIDDEN]"}


# PUT (Works - does create a Webshop)
Processing ChainsController#update (for 127.0.0.1 at 2010-02-06 11:09:13) [PUT]
  Parameters: { "commit"=>"Update", "chain"=> { "name" => "H&M", "set_webshop"=>"1", "website" => "http://www.hm.com", "desc" => "...", "email" => "info@hm.com"}, "authenticity_token"=>"[HIDDEN]", "id"=>"444-h-m"}

有没有一种特殊的方法来处理 Rails 中新模型的 virtual_attributes?

4

1 回答 1

3

它可能不起作用,因为在这一行

self.create_webshop(:url => self.website)

要为新连锁店创建网上商店,您还没有连锁店的 id(此时尚未创建),因此不可能创建关联。

定义一个 after_save 回调并在那里创建一个网上商店。同时要记住复选框的值,您可以将其存储在attr_accessor.

于 2010-02-06T12:52:44.630 回答