dojo.data store (e.g. ServiceStore extension) getValue method implementation that allows mapping of attribute names to potentially deep properties

getValue snippet

	getValue: function(/*Object*/ item, /*String*/property, /*value?*/defaultValue){
		// summary:
		//	Gets the value of an item's 'property'
		//
		//	item: 
		//		The item to get the value from
		//	property: 
		//		property to look up value for	
		//	defaultValue: 
		//		the default value

		var value = void(0), // undefined
			attrData = this.itemPropertyMapping[property] || {},
			dotpath = attrData.mapping;

		if(dotpath) {
			// use the mapping to lookup the property value in the item
			value = dojo.getObject(dotpath, false, item);
		} else {
			// fallback to a plain property look up
			value = item[property];
		}
		if(attrData.format) {
			value = attrData.format(value, property, attrData);
		}

		// TODO: lazy-loaded value access not tested
		return typeof value !== "undefined" ? 
				value : // return the plain value since it was found;
				(item._loadObject ? // property was not found, maybe because the item is not loaded, we will try to load it synchronously so we can get the property 
					(dojox.rpc._sync = true) && arguments.callee.call(this,dojox.data.ServiceStore.prototype.loadItem({item:item}) || {}, property, defaultValue) : // load the item and run getValue again 
					defaultValue);// not in item -> return default value
	}