Task: Properly handle None in serialize_due

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

diff --git a/tasklib/task.py b/tasklib/task.py
index 8fe1e1b47df278c8d58e8692a266dbc3215ac6c1..5acabe0e2952ecc032002c00079586655ec9fbe1 100644 (file)
--- a/tasklib/task.py
+++ b/tasklib/task.py
@@ -122,10 +122,21 @@ class Task(TaskResource):
         return self['description']
 
     def __eq__(self, other):
-        return self['uuid'] == other['uuid']
+        if self['uuid'] and other['uuid']:
+            # For saved Tasks, just define equality by equality of uuids
+            return self['uuid'] == other['uuid']
+        else:
+            # If the tasks are not saved, compare the actual instances
+            return id(self) == id(other)
+
 
     def __hash__(self):
-        return self['uuid'].__hash__()
+        if self['uuid']:
+            # For saved Tasks, just define equality by equality of uuids
+            return self['uuid'].__hash__()
+        else:
+            # If the tasks are not saved, return hash of instance id
+            return id(self).__hash__()
 
     @property
     def _modified_fields(self):
@@ -154,6 +165,8 @@ class Task(TaskResource):
         return self['uuid'] is not None or self['id'] is not None
 
     def serialize_due(self, date):
+        if not date:
+            return None
         return date.strftime(DATE_FORMAT)
 
     def deserialize_due(self, date_str):
@@ -291,7 +304,8 @@ class Task(TaskResource):
             elif field == 'depends':
                 args.append('{0}:{1}'.format(field, self.format_depends()))
             else:
-                args.append('{0}:{1}'.format(field, self._data[field]))
+                # Use empty string to substitute for None value
+                args.append('{0}:{1}'.format(field, self._data[field] or ''))
 
         # If we're modifying saved task, simply pass on all modified fields
         if self.saved: