angularjs: how to add caching to resource object?

Question

To add caching inside http is pretty straight forward. ( by passing cache=true )

http://docs.angularjs.org/api/ng.$http has Cache option.

How do I add simila

Answer 1

As the docs state, $resource has built-in support for $cacheFactory. You can pass it in via the cache property of each action:

cache – {boolean|Cache} – If true, a default $http cache will be used to cache the GET request, otherwise if a cache instance built with $cacheFactory, this cache will be used for caching.

Example usage:

app.factory('Todos', function($resource, $cacheFactory) {
    var todosCache = $cacheFactory('Todos');
    return $resource(apiBaseUrl + '/todos/:id', {id: '@id'}, {
        'get': { method:'GET', cache: todosCache},
        'query': { method:'GET', cache: todosCache, isArray:true }
    });
});

Answer 2

Implementing your own cache in AngularJs is quite easy. Just use $cacheFactory:

app.factory('myService', function($resource, $cacheFactory) {
   var cache = $cacheFactory('myService');
   var User = $resource('/user/:userId', {userId:'@id'});

   return {
      getResource: function(userId) {
         var user = cache.get(userId);
         if (!user) {
            user = User.get({userId:userId});
            cache.put(userId, user);   
         }
         return user;
      }
   };
});