add count to relations

Signed-off-by: Jaka Hudoklin <jakahudoklin@gmail.com>

lib/scope.js

@@ -138,6 +138,7 @@ function defineScope(cls, targetClass, name, params, methods, options) {
       f.build = build;
       f.create = create;
       f.destroyAll = destroyAll;
+      f.count = count;
       for (var i in definition.methods) {
         f[i] = definition.methods[i].bind(self);
       }
@@ -183,6 +184,13 @@ function defineScope(cls, targetClass, name, params, methods, options) {
 
   cls['__delete__' + name] = fn_delete;
 
+  var fn_count = function (cb) {
+    var f = this[name].count;
+    f.apply(this[name], arguments);
+  };
+
+  cls['__count__' + name] = fn_count;
+
   /*
    * Extracting fixed property values for the scope from the where clause into
    * the data object
@@ -239,6 +247,11 @@ function defineScope(cls, targetClass, name, params, methods, options) {
     var where = (this._scope && this._scope.where) || {};
     targetClass.destroyAll(where, cb);
   }
+
+  function count(cb) {
+    var where = (this._scope && this._scope.where) || {};
+    targetClass.count(where, cb);
+  } 
   
   return definition;
 }

test/relations.test.js

@@ -537,6 +537,16 @@ describe('relations', function () {
         });
       });
     });
+
+    it('should find count of records on scope - scoped', function (done) {
+      Category.findOne(function (err, c) {
+        c.productType = 'tool'; // temporary, for scoping
+        c.products.count(function(err, count) {
+          count.should.equal(1);
+          done();
+        });
+      });
+    });
     
     it('should delete records on scope - scoped', function (done) {
       Category.findOne(function (err, c) {