Fix extended model interface

`elements` are preserved or defaulted to `[]` `relations` are preserved or defaulted to `[]` `metadata` are preserved or defaulted to `{}` Closes #1
B3rn475 · Nov 13, 2017 · f860b36 · f860b36
1 parent 123979b
commit f860b36
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/lib/extender.js b/lib/extender.js
@@ -64,8 +64,9 @@ function createModel(options) {
     function Model(json) {
         if (!(this instanceof Model)) { return new Model(json); }
 
-        this.elements = json.elements.slice();
-        this.relations = json.relations.slice();
+        this.elements = (json.elements || []).slice();
+        this.relations = (json.relations || []).slice();
+        this.metadata = json.metadata || {};
 
         var self = this,
             element = createElementsLookup(this.elements),