sync localstorage with jsonp duplicate entries

[kbas]

Hello,
i'm trying to learn sencha touch, i followed this tutorial http://lalexgraham.wordpress.com/201...p-proxy-store/ all is working but i have a problem with the pullrefresh plugin.

view:

....
 plugins: [
                    {
                        xtype: 'component',
                        refreshFn: function(plugin) {
                            console.log('refresh pulled');
                            this.fireEvent('refreshlist',this);
                        },
                        type: 'pullrefresh'
                    }
                ]

...

controller:

....
 onRefreshList: function(target) {
        console.log('onrefreshlist angekommen');
        var remotestore = Ext.getStore('MarketRemoteStore');
        remotestore.on({load:'onMarketsStoreLoad', scope: this});
        remotestore.load({addRecord:true});
    },
  onMarketsStoreLoad: function() {
        console.log('onmarketsStoreLoad');
        var marketLocalStore = Ext.getStore('MarketLocalStore');
        var marketStore = Ext.getStore('MarketRemoteStore');


        marketStore.each(function(item){marketLocalStore.add(item.copy()); });
        marketLocalStore.sync();


        console.log(marketLocalStore.getCount());
        console.log(marketLocalStore);
    }

model:

Ext.define('ss_test.model.market', {
    extend: 'Ext.data.Model',


    config: {
        idProperty: 'ID',
        identifier: 'uuid',
        useCache: false,
        fields: [
            {
                name: 'Name',
                type: 'string'
            },
            {
                name: 'logo',
                type: 'string'
            },
            {
                name: 'ID',
                type: 'auto'
            }
        ],
        proxy: {
            type: 'localstorage',
            id: 'ProxyMarket'
        }
    }
});

remotestore:

Ext.define('ss_test.store.MarketRemoteStore', {
    extend: 'Ext.data.Store',


    requires: [
        'Ext.data.proxy.JsonP',
        'ss_test.model.market'
    ],


    config: {
        model: 'ss_test.model.market',
        pageSize: 3,
        storeId: 'MarketRemoteStore',
        proxy: {
            type: 'jsonp',
            url: 'http://test.localdomain.com/api/market/.json',
            reader: {
                type: 'json',
                rootProperty: 'items',
                useSimpleAccessors: false
            }
        }
    }
});

localstore:

Ext.define('ss_test.store.MarketLocalStore', {
    extend: 'Ext.data.Store',


    requires: [
        'ss_test.model.market'
    ],


    config: {
        model: 'ss_test.model.market',
        pageSize: 3,
        storeId: 'MarketLocalStore'
    }
});

always when i use the pullrefresh it adds the same data again to localstorage.
i read in the forum and tried setting idProperty but nothing help.
i also renamed the ID field in the model to MarketID and add a mapping:ID to it and tryed but the idProperty field is in localstorage always different.
can someone help me whats the problem here

[mitchellsimoens]

Instead of blindly adding the recs to the localstorage store, I would check to see if there is a record with that ID. If there is then update the record data, if not then add it.