App.cfg.modelChatUser = {
    url: '/um/lib/chat/user',
    fields:[
    {
        name: 'id',
        type: 'string',
        persist: false
    }
    ],
    columns:[
    {
        dataIndex:'id',
        flex: 1
    }
    ]
}

Ext.define('App.model.userman.chatUser',{
    extend: App.model.BaseCRUD,
    fields: App.cfg.modelChatUser.fields
})

@@ -87,16 +87,17 @@
  name: '
+_
 id',%0D%0A  
@@ -120,33 +120,8 @@
 ing'
-,%0D%0A        persist: false
 %0D%0A  
@@ -173,17 +173,19 @@
 taIndex:
-'
+ '_
 id',%0D%0A  

use CRUD model's ID === _id as id