Take pagination into account when listing tasks for all shots.

This is a stop-gap measure; we probably want to abstract this away into
something more reusable. Better to do that after switching to Python 3,
though.

attract/shots_and_assets/__init__.py

@@ -138,6 +138,8 @@ class ShotAssetManager(object):
 
         """
 
+        from pillar.web.utils import last_page_index
+
         api = pillar_api()
 
         id_to_shot = {}
@@ -147,22 +149,31 @@ class ShotAssetManager(object):
             id_to_shot[shot_id] = shot
             shot_id_to_tasks[shot_id] = collections.defaultdict(set)
 
+        page_idx = 1
+        while True:
             found = pillarsdk.Node.all({
                 'where': {
                     'node_type': node_type_task['name'],
                     'parent': {'$in': list(id_to_shot.keys())},
-            }
+                },
+                'page': page_idx,
             }, api=api)
 
             known = set(known_task_types)  # for fast lookups
 
-        # Now put the tasks into the right spot.
+            # Put the tasks into the right spot.
             for task in found['_items']:
                 task_type = task.properties.task_type
                 if task_type not in known:
                     task_type = None
                 shot_id_to_tasks[task.parent][task_type].add(task)
 
+            # Keep looping over the pages. Result count can change between
+            # queries, so always recompute the last page index.
+            if page_idx >= last_page_index(found['_meta']):
+                break
+            page_idx += 1
+
         return shot_id_to_tasks
 
     def edit_shot(self, shot_id, **fields):