API: Add support for searching tasks by name

This allows users to query the API like so:

    /api/v1/tasks?name=install

The search above would return tasks with "install" in the name of the
task.

Change-Id: Ia549d33cd6c9e4de7702b1a2994d4c4adfc75032

ara/api/filters.py

@@ -103,6 +103,7 @@ class TaskFilter(DateFilter):
     status = django_filters.MultipleChoiceFilter(
         field_name="status", choices=ara_models.Task.STATUS, lookup_expr="iexact"
     )
+    name = django_filters.CharFilter(field_name="name", lookup_expr="icontains")
 
     # fmt: off
     order = django_filters.OrderingFilter(

ara/api/tests/tests_task.py

@@ -136,6 +136,17 @@ class TaskTestCase(APITestCase):
         self.assertEqual(task.name, request.data["results"][1]["name"])
         self.assertEqual("task2", request.data["results"][0]["name"])
 
+    def test_get_tasks_by_name(self):
+        # Create a playbook and two tasks
+        playbook = factories.PlaybookFactory()
+        task = factories.TaskFactory(name="task1", playbook=playbook)
+        factories.TaskFactory(name="task2", playbook=playbook)
+
+        # Query for the first task name and expect one result
+        request = self.client.get("/api/v1/tasks?name=%s" % task.name)
+        self.assertEqual(1, len(request.data["results"]))
+        self.assertEqual(task.name, request.data["results"][0]["name"])
+
     def test_get_task_duration(self):
         started = timezone.now()
         ended = started + datetime.timedelta(hours=1)