Allow to add connection with through data for HasManyThrough relation

Signed-off-by: Clark Wang <clark.wangs@gmail.com>

lib/relation-definition.js

@@ -919,13 +919,16 @@ HasManyThrough.prototype.create = function create(data, done) {
  * Add the target model instance to the 'hasMany' relation
  * @param {Object|ID} acInst The actual instance or id value
  */
-HasManyThrough.prototype.add = function (acInst, done) {
+HasManyThrough.prototype.add = function (acInst, data, done) {
   var self = this;
   var definition = this.definition;
   var modelThrough = definition.modelThrough;
   var pk1 = definition.keyFrom;
 
-  var data = {};
+  if (typeof data === 'function') {
+    done = data;
+    data = {};
+  }
   var query = {};
   
   // The primary key for the target model

test/relations.test.js

@@ -433,6 +433,24 @@ describe('relations', function () {
       });
     });
 
+    it('should allow to add connection with through data', function (done) {
+      Physician.create({name: 'ph1'}, function (e, physician) {
+        Patient.create({name: 'pa1'}, function (e, patient) {
+          var now = Date.now();
+          physician.patients.add(patient, { date: new Date(now) }, function (e, app) {
+            should.not.exist(e);
+            should.exist(app);
+            app.should.be.an.instanceOf(Appointment);
+            app.physicianId.should.equal(physician.id);
+            app.patientId.should.equal(patient.id);
+            app.patientId.should.equal(patient.id);
+            app.date.getTime().should.equal(now);
+            done();
+          });
+        });
+      });
+    });
+
     it('should allow to remove connection with instance', function (done) {
       var id;
       Physician.create(function (err, physician) {