Filter controller extension to change behavior to utilize OR operand

filter.js

({
	/* File: ./custom/modules/<Module>/clients/base/layouts/filter/filter.js */
	extendsFrom: 'FilterLayout',

	applyFilter: function(query, dynamicFilterDef) {
		var customFilterDef = [{'$or':[{'billing_address_city':{'$starts':query}},{'name':{'$starts':query}}]}];

		// TODO: getRelevantContextList needs to be refactored to handle filterpanels in drawer layouts,
		// as it will return the global context instead of filtering a list view within the drawer context.
		// As a result, this flag is needed to prevent filtering on the global context.
		var filterOptions = this.context.get('filterOptions') || {};
		if (filterOptions.auto_apply === false) {
			return;
		}

		//If the quicksearch field is not empty, append a remove icon so the user can clear the search easily
		this._toggleClearQuickSearchIcon(!_.isEmpty(query));
		// reset the selected on filter apply
		var massCollection = this.context.get('mass_collection');
		if (massCollection && massCollection.models && massCollection.models.length > 0) {
			massCollection.reset([],{silent: true});
		}
		var self = this,
			ctxList = this.getRelevantContextList();
		_.each(ctxList, function(ctx) {
			var ctxCollection = ctx.get('collection'),
				origFilterDef = dynamicFilterDef || ctxCollection.origFilterDef || [],
				filterDef = customFilterDef,
				options = {
					//Show alerts for this request
					showAlerts: true,
					success: function(collection, response, options) {
						// Close the preview pane to ensure that the preview
						// collection is in sync with the list collection.
						app.events.trigger('preview:close');
					}};

			ctxCollection.filterDef = filterDef;
			ctxCollection.origFilterDef = origFilterDef;
			ctxCollection.resetPagination();

			options = _.extend(options, ctx.get('collectionOptions'));

			ctx.resetLoadFlag(false);
			if (!_.isEmpty(ctx._recordListFields)) {
				ctx.set('fields', ctx._recordListFields);
			}
			ctx.set('skipFetch', false);
			ctx.loadData(options);
		});
	}

})