Add tests for tracking non-field attributes

model_utils/tests/models.py

@@ -253,6 +253,16 @@ class TrackedNotDefault(models.Model):
     name_tracker = FieldTracker(fields=['name'])
 
 
+class TrackedNonFieldAttr(models.Model):
+    number = models.FloatField()
+
+    @property
+    def rounded(self):
+        return round(self.number) if self.number is not None else None
+
+    tracker = FieldTracker(fields=['rounded'])
+
+
 class TrackedMultiple(models.Model):
     name = models.CharField(max_length=20)
     number = models.IntegerField()

model_utils/tests/tests.py

@@ -22,8 +22,8 @@ from model_utils.tests.models import (
     StatusPlainTuple, TimeFrame, Monitored, StatusManagerAdded,
     TimeFrameManagerAdded, Dude, SplitFieldAbstractParent, Car, Spot,
     ModelTracked, ModelTrackedFK, ModelTrackedNotDefault, ModelTrackedMultiple,
-    Tracked, TrackedFK, TrackedNotDefault, TrackedMultiple,
-    StatusFieldDefaultFilled, StatusFieldDefaultNotFilled)
+    Tracked, TrackedFK, TrackedNotDefault, TrackedNonFieldAttr,
+    TrackedMultiple, StatusFieldDefaultFilled, StatusFieldDefaultNotFilled)
 
 
 
@@ -889,6 +889,57 @@ class FieldTrackedModelCustomTests(FieldTrackerTestCase,
         self.assertCurrent(name='new age')
 
 
+class FieldTrackedModelAttributeTests(FieldTrackerTestCase):
+
+    tracked_class = TrackedNonFieldAttr
+
+    def setUp(self):
+        self.instance = self.tracked_class()
+        self.tracker = self.instance.tracker
+
+    def test_previous(self):
+        self.assertPrevious(rounded=None)
+        self.instance.number = 8.5
+        self.assertPrevious(rounded=None)
+        self.instance.save()
+        self.assertPrevious(rounded=9)
+        self.instance.number = 8.2
+        self.assertPrevious(rounded=9)
+        self.instance.save()
+        self.assertPrevious(rounded=8)
+
+    def test_has_changed(self):
+        self.assertHasChanged(rounded=False)
+        self.instance.number = 8.5
+        self.assertHasChanged(rounded=True)
+        self.instance.save()
+        self.assertHasChanged(rounded=False)
+        self.instance.number = 8.2
+        self.assertHasChanged(rounded=True)
+        self.instance.number = 8.8
+        self.assertHasChanged(rounded=False)
+
+    def test_changed(self):
+        self.assertChanged()
+        self.instance.number = 8.5
+        self.assertPrevious(rounded=None)
+        self.instance.save()
+        self.assertPrevious()
+        self.instance.number = 8.8
+        self.assertPrevious()
+        self.instance.number = 8.2
+        self.assertPrevious(rounded=9)
+        self.instance.save()
+        self.assertPrevious()
+
+    def test_current(self):
+        self.assertCurrent(rounded=None)
+        self.instance.number = 8.5
+        self.assertCurrent(rounded=9)
+        self.instance.save()
+        self.assertCurrent(rounded=9)
+
+
 class FieldTrackedModelMultiTests(FieldTrackerTestCase,
                                    FieldTrackerCommonTests):