function (BlockResource) {
    var collection;

    // initializes collection
    this.init = function () {
        collection = BlockResource.get().$promise;
    };

    // gets 1 block by id
    this.getBlock = function (id) {
        if (!collection) {
            this.init();
        }
        return collection.then(function (blocks) {
            return blocks.filter(function (block) {
                return block.id == id;
            });
        });
    };

    // gets all blocks
    this.getBlocks = function () {
        if (!collection) {
            this.init();
        }
        return collection;
    };
}