Encapsulate threshold layer validation in aggregation-mapconfig

lib/cartodb/models/aggregation/aggregation-map-config.js

@@ -89,6 +89,14 @@ module.exports = class AggregationMapConfig extends MapConfig {
         return aggregation;
     }
 
+    doesLayerReachThreshold(index, featureCount) {
+        const threshold = this.getAggregation(index) && this.getAggregation(index).threshold ?
+            this.getAggregation(index).threshold :
+            AggregationMapConfig.THRESHOLD;
+
+        return featureCount >= threshold;
+    }
+
     validate () {
         const validate = aggregationValidator(this);
         const numberValidator = createNumberValidator(this);

lib/cartodb/models/mapconfig/adapter/aggregation-mapconfig-adapter.js

@@ -118,11 +118,7 @@ module.exports = class AggregationMapConfigAdapter {
             const result = res.rows[0] || {};
             const estimatedFeatureCount = result.count;
 
-            const threshold = layer.options.aggregation && layer.options.aggregation.threshold ?
-                layer.options.aggregation.threshold :
-                AggregationMapConfig.THRESHOLD;
-
-            if (estimatedFeatureCount < threshold) {
+            if (!mapConfig.doesLayerReachThreshold(index, estimatedFeatureCount)) {
                 return callback(null, shouldAdapt);
             }