Extjs Store DataModel Subfield Null Error -

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when try load remotely data grid error subfields: 

cannot read property 'id' of null

my datamodel: 

    ext.define('ruledatamodel', {         extend: 'ext.data.model',         fields: [            { name: 'id'},            { name: 'createtime', type:'date', dateformat: 'timestamp', convert:function(v,j){ return (v != null?new date(v):null);}},            { name: 'discountpercent'},            { name: 'discountamount'},            { name: 'discountoversalepriceflag', type: 'boolean'},            { name: 'minsalepricetotal'},            { name: 'maxcount'},            { name: 'execorder'},            { name: 'clearanceincludedflag', type: 'boolean'},            { name: 'relatedproductmincount'},            { name: 'promocoderuletypename', mapping: 'promocoderuletype.friendlytype'},            { name: 'groupname'},            { name: 'producttypeid', mapping: 'producttype.id', defaultvalue: ''},            { name: 'producttypename', mapping: 'producttype.name', defaultvalue: ''},            { name: 'relatedproducttypeid', mapping: 'relatedproducttype.id', defaultvalue: ''},            { name: 'relatedproducttypename', mapping: 'relatedproducttype.name', defaultvalue: ''}         ],          idproperty: 'id'     });

returned json data:

{totalcount: 1, root: [{"producttype": {"name": ... "relatedproducttype":null, ... "execorder":0,"id":11}]}

check following things :

  1. check namespace of model. ruledatamodel or foo.bar.ruledatamodel?

  2. there might problem json. there simple way test if json correct or not. save json in .json file , open file in browser. if browser able open json file correctly json correct, otherwise not.


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