Question

我的“entries_controller.rb”

中有以下代码

 def update
     @entry = Entry.find(params[:id])
     puts "received HTTP request to update old entry:#{@entry.inspect} with"
     puts "new parameters: #{params}"
     if @entry.update_attributes(params[:entry])
       puts"Update was successful"
       @entry2 = Entry.find(params[:id])
       puts "Here is the new value #{@entry2.inspect}"
     end
  end

当我从客户端向服务器发送put请求时，我的控制台显示：

  2013-02-17T20:12:25+00:00 app[web.1]: received HTTP request to update old 
  entry:#<Entry id: 1, created_at: "2013-02-17 19:17:40", updated_at: "2013-02-17 19:17:40", 
  description: "Test", title: "Home", category: "-1", latitude: "49.258061", longitude: "-123.153972", hasPhoto: false> with

  2013-02-17T20:12:25+00:00 app[web.1]: new parameters: {"description"=>"Test", "id"=>"1", "category"=>"-1", "hasPhoto"=>"0", "latitude"=>"49.258061", "longitude"=>"-123.153972", 
  "title"=>"Updated home", "action"=>"update", "controller"=>"entries", "format"=>"json"}

  2013-02-17T20:12:25+00:00 app[web.1]: Update was successful

  2013-02-17T20:12:25+00:00 app[web.1]: Here is the new value #<Entry id: 1, created_at: "2013-02-17 19:17:40", updated_at: "2013-02-17 19:17:40", description: "Test", 
  title: "Home", category: "-1", latitude: "49.258061", longitude: "-123.153972", hasPhoto: false>

正如您所看到的那样，旧记录并没有真正更新。即使if子句被评估为真。请参阅“标题”的值未从“主页”更改为“已更新主页”。

我想知道这个中的错误是什么？它说它更新但没有真正更新。

有人可以帮我理解这个吗？

由于

Answer 1

在您的视图文件中，您没有在视图中设置相应的表单。您的参数正在返回

{"description"=>"Test", "id"=>"1", "category"=>"-1", "hasPhoto"=>"0", "latitude"=>"49.258061", "longitude"=>"-123.153972", 
  "title"=>"Updated home", "action"=>"update", "controller"=>"entries", "format"=>"json"}

实际上他们应该回来......

{"entry" => {"description"=>"Test", "id"=>"1", "category"=>"-1", "hasPhoto"=>"0", "latitude"=>"49.258061", "longitude"=>"-123.153972", 
  "title"=>"Updated home"}, "action"=>"update", "controller"=>"entries", "format"=>"json"}

注意区别？您的有关条目的参数将被包装并附加到属性条目。这样，当Rails查看您的参数时，它会知道哪些参数适用于您新更新的条目。没有看你的表格，没有办法告诉你如何具体修复它，但这里是start的好地方。

Rails update_attributes没有更新记录

1 个答案: