Sencha: Catch all events of Observable

Very useful pattern to catch all events of Observable object in Sencha:

Ext.util.Observable.capture(object, function(){
    console.log(arguments);
});

This object might be Store, View, or whatever using Observable mixin. This may be useful to learn how the object work or to catch events before any other on/addListener listeners.

Arguments may wary but it contains at least two objects:
0: {String} always event name
1: {Object} object itself

This may contain other arguments such as Action, changed Model (for Store), String name of the action caused event, Array of changed fields (for Model and Store)

Store usage:

Ext.util.Observable.capture(store, function(){
    if (arguments[0]=='update') {
        /*eventName,store,record,operation,modifiedFields*/
        // Your fancy code here
        store.suspendEvent('update');
    }
});

Getting rid of annoying Uncaught TypeError: Cannot read property 'isGroupHeader' of null

"Uncaught TypeError: Cannot read property 'isGroupHeader' of null" in sencha 4.x might be caused by nested grids usage. For example if you have grid with RowExpander rendering another grid into expander.

This happens because grid cell or cell editor event (mouseover, click or whatever) is fired in context of another grid (parent or ancestor).

This override might help (it works fine on 4.2.2 for me):

Ext.define('SystemFox.overrides.view.Table', {
    override: 'Ext.view.Table',
    checkThatContextIsParentGridView: function(e){
        var target = Ext.get(e.target);
        var parentGridView = target.up('.x-grid-view');
        if (this.el != parentGridView) {
            /* event of different grid caused by grids nesting */
            return false;
        } else {
            return true;
        }
    },
    processItemEvent: function(record, row, rowIndex, e) {
        if (e.target && !this.checkThatContextIsParentGridView(e)) {
            return false;
        } else {
            return this.callParent([record, row, rowIndex, e]);
        }
    }
});