Update models.activity.ActivityTask.from_poll(): do not use querysets (to make less calls to the SWF API)

Author: ggreg

swf/models/activity.py

@@ -241,18 +241,17 @@ def __init__(self, domain, task_list,
 
     @classmethod
     def from_poll(cls, domain, task_list, data):
-        from swf.querysets import ActivityTypeQuerySet
-        from swf.querysets import WorkflowExecutionQuerySet
+        from .workflow import WorkflowExecution
 
-        activity_type = ActivityTypeQuerySet(domain).get(
+        activity_type = ActivityType(
+            domain,
             data['activityType']['name'],
-            data['activityType']['version'],
-        )
+            data['activityType']['version'])
 
-        workflow_execution = WorkflowExecutionQuerySet(domain).get(
+        workflow_execution = WorkflowExecution(
+            domain,
             data['workflowExecution']['workflowId'],
-            data['workflowExecution']['runId'],
-        )
+            data['workflowExecution']['runId'])
 
         return cls(
             domain,