models: Add Track.disc_no (#286)

docs/changes.rst

@@ -38,6 +38,8 @@ v0.11.2 (UNRELEASED)
 - Add :attr:`mopidy.models.Album.images` field for including album art URIs.
   (Partly fixes :issue:`263`)
 
+- Add :attr:`mopidy.models.Track.disc_no` field. (Partly fixes: :issue:`286`)
+
 
 v0.11.1 (2012-12-24)
 ====================

mopidy/models.py

@@ -212,6 +212,8 @@ class Track(ImmutableObject):
     :type album: :class:`Album`
     :param track_no: track number in album
     :type track_no: integer
+    :param disc_no: disc number in album
+    :type disc_no: integer or :class:`None` if unknown
     :param date: track release date (YYYY or YYYY-MM-DD)
     :type date: string
     :param length: track length in milliseconds
@@ -234,9 +236,12 @@ class Track(ImmutableObject):
     #: The track :class:`Album`. Read-only.
     album = None
 
-    #: The track number in album. Read-only.
+    #: The track number in the album. Read-only.
     track_no = 0
 
+    #: The disc number in the album. Read-only.
+    disc_no = None
+
     #: The track release date. Read-only.
     date = None
 

tests/models_test.py

@@ -396,6 +396,12 @@ class TrackTest(unittest.TestCase):
         self.assertEqual(track.track_no, track_no)
         self.assertRaises(AttributeError, setattr, track, 'track_no', None)
 
+    def test_disc_no(self):
+        disc_no = 2
+        track = Track(disc_no=disc_no)
+        self.assertEqual(track.disc_no, disc_no)
+        self.assertRaises(AttributeError, setattr, track, 'disc_no', None)
+
     def test_date(self):
         date = '1977-01-01'
         track = Track(date=date)