travis: Drop support for Python2.6

[etc/taskwarrior.git] / tasklib / serializing.py

diff --git a/tasklib/serializing.py b/tasklib/serializing.py
index 767f7df7cc47f3cb52dfd0f85a084b1af4e0bea5..45942851d774550492fe14e96f75d115ebac77dd 100644 (file)
--- a/tasklib/serializing.py
+++ b/tasklib/serializing.py
@@ -5,6 +5,9 @@ import pytz
 import six
 import tzlocal
 
+
+from .lazy import LazyUUIDTaskSet
+
 DATE_FORMAT = '%Y%m%dT%H%M%SZ'
 local_zone = tzlocal.get_localzone()
 
@@ -181,11 +184,18 @@ class SerializingObject(object):
     def serialize_depends(self, value):
         # Return the list of uuids
         value = value if value is not None else set()
-        return ','.join(task['uuid'] for task in value)
+
+        if isinstance(value, LazyUUIDTaskSet):
+            return ','.join(value._uuids)
+        else:
+            return ','.join(task['uuid'] for task in value)
 
     def deserialize_depends(self, raw_uuids):
         raw_uuids = raw_uuids or []  # Convert None to empty list
 
+        if not raw_uuids:
+            return set()
+
         # TW 2.4.4 encodes list of dependencies as a single string
         if type(raw_uuids) is not list:
             uuids = raw_uuids.split(',')
@@ -193,7 +203,7 @@ class SerializingObject(object):
         else:
             uuids = raw_uuids
 
-        return set(self.backend.tasks.get(uuid=uuid) for uuid in uuids if uuid)
+        return LazyUUIDTaskSet(self.backend, uuids)
 
     def datetime_normalizer(self, value):
         """