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Thread: Merging instance configs with class config recursively

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  1. #1
    Sencha Premium User
    Join Date
    Mar 2009

    Default Merging instance configs with class config recursively

    Hi, I am trying to do a Ext.Config.merge as per this thread:

    Basically we have a lot of remote combos in our application, and I am trying to reduce the boilerplate code. So here's a class definition:

    Ext.define('Imbibe.App.Ext.Form.ApiComboBox', {
        extend: 'Ext.form.field.ComboBox',
        xtype: 'itnet-apicombobox',
        config: {
            queryMode: 'remote',
            minChars: 0,
            forceSelection: true,
            store: {
                $value: {
                    xtype: 'json',
                    remoteSort: false,
                    pageSize: 25,
                    autoLoad: false,
                    proxy: {
                        type: 'apiajax',
                        actionMethods: { read: 'POST' },
                        reader: {
                            type: 'apijson',
                            rootProperty: 'data',
                            totalProperty: 'total'
                merge: function (newValue, oldValue) {
                    var val = Ext.merge(newValue, oldValue);
                    return (val);
    Here's how I try to instantiate it:
        xtype: 'itnet-apicombobox',
        name: 'dmPublisherId',
        fieldLabel: t('Publisher'),
        displayField: 'name',
        valueField: 'dmPublisherId',
        store: {
            fields: ['dmPublisherId', 'name'],
            proxy: {
                url: Imbibe.App.Url.resolveApiUrl('Kira/Publisher/Find'),
    As per the reference blog page, my expectation is I should be getting the raw $value object from class definition as oldValue inside the merge function. However what I get is a plane object with all primitive properties removed:

    Is this the expected behaviour? I mean it would really help to eliminate a lot of redundant code if we can merge full objects from class definition and instance config.

  2. #2
    Sencha Premium User
    Join Date
    Apr 2007
    Sydney, Australia


    The issue here is that the combo isn't really setup to deal with the store being an Ext.Config config. The default behaviour for objects is to merge them.

    Here's an example of a class that is expecting configs:

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