API: Add support for searching task by action

This allows users to query the API like so:

    /api/v1/tasks?action=command

The search above would return tasks that used the "command" module.

Change-Id: I01226a9706a0004970cf7d6ef5d725998ae71827

ara/api/filters.py

@@ -105,6 +105,7 @@ class TaskFilter(DateFilter):
         field_name="status", choices=ara_models.Task.STATUS, lookup_expr="iexact"
     )
     name = django_filters.CharFilter(field_name="name", lookup_expr="icontains")
+    action = django_filters.CharFilter(field_name="action", lookup_expr="iexact")
 
     # fmt: off
     order = django_filters.OrderingFilter(

ara/api/tests/tests_task.py

@@ -220,3 +220,17 @@ class TaskTestCase(APITestCase):
         # Test multiple status
         request = self.client.get("/api/v1/tasks?status=running&status=completed")
         self.assertEqual(2, len(request.data["results"]))
+
+    def test_get_task_by_action(self):
+        task = factories.TaskFactory(action="debug")
+        factories.TaskFactory(action="setup")
+
+        # Confirm we have two objects
+        request = self.client.get("/api/v1/tasks")
+        self.assertEqual(2, len(request.data["results"]))
+
+        # Expect the correct single result when searching
+        request = self.client.get("/api/v1/tasks?action=debug")
+        self.assertEqual(1, len(request.data["results"]))
+        self.assertEqual(task.id, request.data["results"][0]["id"])
+        self.assertEqual(task.action, request.data["results"][0]["action"])