Sketch of vector overviews support

lib/cartodb/controllers/map.js

@@ -18,6 +18,8 @@ var TablesCacheEntry = require('../cache/model/database_tables_entry');
 var MapConfigNamedLayersAdapter = require('../models/mapconfig_named_layers_adapter');
 var NamedMapMapConfigProvider = require('../models/mapconfig/named_map_provider');
 var CreateLayergroupMapConfigProvider = require('../models/mapconfig/create_layergroup_provider');
+var OverviewsApi = require('../api/overviews_api');
+var MapConfigOverviewsAdapter = require('../models/mapconfig_overviews_adapter');
 
 /**
  * @param {AuthApi} authApi
@@ -41,11 +43,13 @@ function MapController(authApi, pgConnection, templateMaps, mapBackend, metadata
     this.mapBackend = mapBackend;
     this.metadataBackend = metadataBackend;
     this.queryTablesApi = queryTablesApi;
+    this.overviewsApi = new OverviewsApi(this.queryTablesApi);
     this.surrogateKeysCache = surrogateKeysCache;
     this.userLimitsApi = userLimitsApi;
     this.layergroupAffectedTables = layergroupAffectedTables;
 
     this.namedLayersAdapter = new MapConfigNamedLayersAdapter(templateMaps);
+    this.overviewsAdapter = new MapConfigOverviewsAdapter(overviewsApi);
 }
 
 util.inherits(MapController, BaseController);
@@ -148,6 +152,16 @@ MapController.prototype.create = function(req, res, prepareConfigFn) {
                 }
             );
         },
+        function addOverviewsInformation(err, requestMapConfig, datasource) {
+          assert.ifError(err);
+          var next = this;
+          self.overviewsAdapter.getMapConfig(req.context.user, requestMapConfig, function(err, mapconfig) {
+                if (err) {
+                    return next(err);
+                }
+                return next(null, mapconfig, datasource);
+          });
+        },
         function createLayergroup(err, requestMapConfig, datasource) {
             assert.ifError(err);
             mapConfig = new MapConfig(requestMapConfig, datasource || Datasource.EmptyDatasource());