From 3c4a436d69fb02fca34be8f0189780d33ddbfe85 Mon Sep 17 00:00:00 2001
From: Tomas Babej <tomasbabej@gmail.com>
Date: Fri, 26 Dec 2014 16:39:09 +0100
Subject: [PATCH] Task: Detect modified fields by actual modifications

---
 tasklib/task.py | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/tasklib/task.py b/tasklib/task.py
index 336c050..3860f8e 100644
--- a/tasklib/task.py
+++ b/tasklib/task.py
@@ -29,6 +29,7 @@ class TaskResource(object):
 
     def _load_data(self, data):
         self._data = data
+        self._original_data = data
 
     def __getitem__(self, key):
         hydrate_func = getattr(self, 'deserialize_{0}'.format(key),
@@ -41,7 +42,6 @@ class TaskResource(object):
         dehydrate_func = getattr(self, 'serialize_{0}'.format(key),
                                  lambda x: x)
         self._data[key] = dehydrate_func(value)
-        self._modified_fields.add(key)
 
     def __str__(self):
         s = six.text_type(self.__unicode__())
@@ -107,7 +107,6 @@ class Task(TaskResource):
         kwargs.update(data)
 
         self._load_data(kwargs)
-        self._modified_fields = set()
 
     def __unicode__(self):
         return self['description']
@@ -118,6 +117,12 @@ class Task(TaskResource):
     def __hash__(self):
         return self['uuid'].__hash__()
 
+    @property
+    def _modified_fields(self):
+        for key in self._data.keys():
+            if self._data.get(key) != self._original_data.get(key):
+                yield key
+
     @property
     def completed(self):
         return self['status'] == six.text_type('completed')
@@ -210,7 +215,6 @@ class Task(TaskResource):
             # Circumvent the ID storage, since ID is considered read-only
             self._data['id'] = int(id_lines[0].split(' ')[2].rstrip('.'))
 
-        self._modified_fields.clear()
         self.refresh()
 
     def add_annotation(self, annotation):
@@ -269,8 +273,10 @@ class Task(TaskResource):
             to_update = dict(
                 [(k, new_data.get(k)) for k in only_fields])
             self._data.update(to_update)
+            self._original_data.update(to_update)
         else:
             self._data = new_data
+            self._original_data = new_data
 
 
 class TaskFilter(object):
-- 
2.39.2