Hotfix - subsetOf.length

Author: Vlad Balin

dist/index.js

@@ -97,6 +97,10 @@ function defineSubsetCollection( CollectionConstructor : typeof Collection ) {
         // Subset is always valid.
         _validateNested(){ return 0; }
 
+        get length() : number {
+            return this.models.length || ( this.refs ? this.refs.length : 0 );
+        }
+
         // Must be shallow copied on clone.
         clone( owner? ){
             var Ctor = (<any>this).constructor,

dist/index.js.map

@@ -3358,6 +3358,13 @@ function defineSubsetCollection(CollectionConstructor) {
                 this.models.map(function (model) { return model.id; });
         };
         SubsetOfCollection.prototype._validateNested = function () { return 0; };
+        Object.defineProperty(SubsetOfCollection.prototype, "length", {
+            get: function () {
+                return this.models.length || (this.refs ? this.refs.length : 0);
+            },
+            enumerable: true,
+            configurable: true
+        });
         SubsetOfCollection.prototype.clone = function (owner) {
             var Ctor = this.constructor, copy = new Ctor([], {
                 model: this.model,