discourse/app/assets/javascripts/admin/routes/admin-reports.js.es6

import Report from "admin/models/report";

export default Discourse.Route.extend({
  queryParams: {
    mode: {},
    start_date: {},
    end_date: {},
    category_id: {},
    group_id: {}
  },

  model(params) {
    return Report.find(
      params.type,
      params["start_date"],
      params["end_date"],
      params["category_id"],
      params["group_id"]
    );
  },

  setupController: function(controller, model) {
    controller.setProperties({
      model: model,
      categoryId: model.get("category_id") || "all",
      groupId: model.get("group_id"),
      startDate: moment(model.get("start_date"))
        .utc()
        .format("YYYY-MM-DD"),
      endDate: moment(model.get("end_date"))
        .utc()
        .format("YYYY-MM-DD")
    });
  }
});