AngularJS DB Interface Layer

app.js

/**
 * The idea is to expose an interface from the app side that a service can fulfill
 */
 
angular.module('myapp', ['apiservice'])

    /**
     * We load the service that fulfills the interface through a config on the app side
     */
    .factory('config', function(
        // poemsInterface
        poemsApi
    ) {}).run(function(config) {})
    
    /**
     * The interface to fulfill
     */
    .factory('poemsInterface', function() {
        return {
            getPoem: function() {},
            savePoem: function() {},
            
        };
    })
    
    /**
     * We make use of the interface, could be in a controller or wherever
     */
    .run(function($rootScope, poemsInterface) {
        $rootScope.foo = poemsInterface.getPoem();    
    });
    
    
    
    /**
     * The service that will implement the interface
     */
    angular.module('apiservice', [])
    .factory('poemsApi', function(poemsInterface) {
        var poemsApi = {
            getPoem: function() { return 'my poem from db'; }
        };
        poemsInterface = angular.extend(poemsInterface, poemsApi);
        return poemsInterface;
    });