extjs - Custom store implementing errors -

i'm trying implement custom store extjs 3.4. use this forum post extjs4 version.

now code looks this:

ext.define('teststore', {     extend: 'ext.data.store',     //model: 'testmodel',     fields: [         {name: 'date'},         {name: 'number'},         {name: 'percent'}     ],     storeid: 'teststore',     generatedata: function() {         var me = this,             data = [];         // generate 10 records         for( var i=0;i<10;i++) {             data.push([                 me.randomdate(new date(2012, 0, 1), new date()),                 math.floor( math.random() * 1000 ),                 ( ( math.random() * 1000 ) / 3.2 ).tofixed( 1 )             ]);         }         console.log(data);         return data;     },     randomdate: function(start, end) {         return new date(             start.gettime() + math.random() * (end.gettime() - start.gettime())         );     },     constructor: function() {         console.log('constructor!');         var me = this;         me.superclass.constructor.apply(me, arguments);         me.loaddata(me.generatedata(), true);         //me.add(me.generatedata());     } }); 

and see error:

typeerror: this.reader undefined 

part code breaks:

loaddata : function(o, append){     var r = this.reader.readrecords(o); <-------     this.loadrecords(r, {add: append}, true); }, 

how correctly set reader? think need arrayreader, can't set properly. tried ways...

working code extjs 3.4:

app.store.documents.documentsrandomstore = ext.extend(ext.data.store, { reader: new ext.data.arrayreader(     {         idindex: 0  // id each record first element     },     //rt // recordtype     ext.data.record.create([         {name: 'date'},         {name: 'number'},         {name: 'percent'}     ]) ), storeid: 'documentsrandomstore', generatedata: function(count) {     var data = [];     // generate records     for(var i=0; i<count; i++) {         data.push([             this.randomdate(new date(2016, 0, 1), new date()),             'Документ ' + math.floor( math.random() * 100 ),             ( ( math.random() * 1000 ) / 3.2 ).tofixed( 1 )         ]);     }     return data; }, randomdate: function(start, end) {     return new date(         start.gettime() + math.random() * (end.gettime() - start.gettime())     ); }, constructor: function(count) {     app.store.documents.documentsrandomstore.superclass.constructor.apply(this, arguments);     this.loaddata(this.generatedata(count)); } });