REFACTOR: support booting discourse with DISCOURSE_NO_CONSTANTS

This change is discussed here: https://meta.discourse.org/t/deprecating-es6-compatibility-layer/35821

Prior to this change we were not booting correctly with DISCOURSE_NO_CONSTANTS

app/assets/javascripts/admin/models/admin-dashboard.js.es6

@@ -0,0 +1,40 @@
+
+const AdminDashboard = Discourse.Model.extend({});
+
+AdminDashboard.reopenClass({
+
+  /**
+    Fetch all dashboard data. This can be an expensive request when the cached data
+    has expired and the server must collect the data again.
+
+    @method find
+    @return {jqXHR} a jQuery Promise object
+  **/
+  find: function() {
+    return Discourse.ajax("/admin/dashboard.json").then(function(json) {
+      var model = AdminDashboard.create(json);
+      model.set('loaded', true);
+      return model;
+    });
+  },
+
+  /**
+    Only fetch the list of problems that should be rendered on the dashboard.
+    The model will only have its "problems" attribute set.
+
+    @method fetchProblems
+    @return {jqXHR} a jQuery Promise object
+  **/
+  fetchProblems: function() {
+    return Discourse.ajax("/admin/dashboard/problems.json", {
+      type: 'GET',
+      dataType: 'json'
+    }).then(function(json) {
+      var model = AdminDashboard.create(json);
+      model.set('loaded', true);
+      return model;
+    });
+  }
+});
+
+export default AdminDashboard;