Added depends_on to job decorator

rq/decorators.py

@@ -31,7 +31,11 @@ class job(object):
                 queue = Queue(name=self.queue, connection=self.connection)
             else:
                 queue = self.queue
+            if 'depends_on' in kwargs:
+                depends_on = kwargs.pop('depends_on')
+            else:
+                depends_on = None
             return queue.enqueue_call(f, args=args, kwargs=kwargs,
-                                      timeout=self.timeout, result_ttl=self.result_ttl)
+                                      timeout=self.timeout, result_ttl=self.result_ttl, depends_on=depends_on)
         f.delay = delay
         return f

tests/test_decorator.py

@@ -48,3 +48,25 @@ class TestDecorator(RQTestCase):
             return 'Why hello'
         result = hello.delay()
         self.assertEqual(result.result_ttl, 10)
+
+    def test_decorator_accepts_result_depends_on_as_argument(self):
+        """Ensure that passing in depends_on to the decorator sets the
+        correct dependency on the job
+        """
+
+        @job(queue='queue_name')
+        def foo():
+            return 'Firstly'
+
+        @job(queue='queue_name')
+        def bar():
+            return 'Secondly'
+
+        foo_job = foo.delay()
+        bar_job = bar.delay(depends_on=foo_job)
+
+        self.assertIsNone(foo_job._dependency_id)
+
+        self.assertEqual(bar_job.dependency, foo_job)
+
+        self.assertEqual(bar_job._dependency_id, foo_job.id)