An example of adding custom functionality to an Angular $resource in order to create an action which accepts variables and a callback.

customResourceAction.js

    Event.getDateRange = function (start, end, cb){
      var params = {
        q: {
          filters: [
            {
              name: 'occurrences',
              op: 'any',
              val: {
                'name': 'date',
                'op': 'gte',
                'val': start.format('YYYY-MM-DD')
              }
            },
            {
              name: 'occurrences',
              op: 'any',
              val: {
                'name': 'date',
                'op': 'lte',
                'val': end.format('YYYY-MM-DD')
              }
            }
          ]
        },
        results_per_page: 50
      };

      Event.query(params, function (data) {
        cb(data);
      });
    };