feat(defaults): create defaultsFilte, issue: #34

Author: a8m

src/_filter/collection/defaults.js

@@ -0,0 +1,37 @@
+/**
+ * @ngdoc filter
+ * @name defaults
+ * @kind function
+ *
+ * @description
+ * defaultsFilter allows to specify a default fallback value for properties that resolve to undefined.
+ */
+
+angular.module('a8m.defaults', [])
+  .filter('defaults', ['$parse', function( $parse ) {
+    return function(collection, defaults) {
+
+      collection = (isObject(collection)) ? toArray(collection) : collection;
+
+      if(!isArray(collection) || !isObject(defaults)) {
+        return collection;
+      }
+
+      var keys = deepKeys(defaults);
+
+      collection.forEach(function(elm) {
+        //loop through all the keys
+        keys.forEach(function(key) {
+          var getter = $parse(key);
+          var setter = getter.assign;
+          //if it's not exist
+          if(isUndefined(getter(elm))) {
+            //get from defaults, and set to the returned object
+            setter(elm, getter(defaults))
+          }
+        });
+      });
+
+      return collection;
+    }
+  }]);

test/spec/filter/collection/defaults.js

@@ -0,0 +1,3 @@
+/**
+ * Created by arielmashraki on 10/12/14.
+ */