Service.js

angular.module('api', [])
.factory('Photos', ['$http', function ($http) {
  return {
    items: [],
    busy: true,
    stadium_id: null,
    max_id: null,
    hasMore: true,
    resetItems: function () {
      this.items = [];
    },
    setStadium: function (id) {
      this.stadium_id = id;
    },
    initialPhotos: function () {
      var self = this;
      $http({
        method: 'GET',
        url: 'http://api.worldcupgram.com/stadium/' + this.stadium_id + '/photos',
        cache: true
      }).success(function (result) {
        if (result.data.length > 0) {
          self.max_id = result.pagination.next_max_id;
          for (var i = result.data.length - 1; i >= 0; i--) {
            self.items.push(result.data[i]);
          }
        } else {
          self.hasMore = false;
        }
        self.busy = false;
      });
    },
    loadMore: function () {
      this.busy = true;
      var self = this;
      $http({
        method: 'GET',
        url: 'http://api.worldcupgram.com/stadium/' + this.stadium_id + '/photos',
        params: {
          max_id: this.max_id
        },
        cache: true
      }).success(function (result) {
        if (result.data.length) {
          self.max_id = result.pagination.next_max_id;
          for (var i = result.data.length - 1; i >= 0; i--) {
            self.items.push(result.data[i]);
          }
        } else {
          self.hasMore = false;
        }
        self.busy = false;
      });
    }
  };
}]);