core: Reimplement get_playlists() using new backend API

mopidy/core/playlists.py

@@ -6,6 +6,7 @@ import urlparse
 import pykka
 
 from mopidy.core import listener
+from mopidy.models import Playlist
 from mopidy.utils.deprecation import deprecated_property
 
 
@@ -62,13 +63,14 @@ class PlaylistsController(object):
         .. deprecated:: 1.0
             Use :meth:`as_list` and :meth:`get_items` instead.
         """
-        futures = [b.playlists.playlists
-                   for b in self.backends.with_playlists.values()]
-        results = pykka.get_all(futures)
-        playlists = list(itertools.chain(*results))
-        if not include_tracks:
-            playlists = [p.copy(tracks=[]) for p in playlists]
-        return playlists
+        playlist_refs = self.as_list()
+
+        if include_tracks:
+            playlists = [self.lookup(r.uri) for r in playlist_refs]
+            return [pl for pl in playlists if pl is not None]
+        else:
+            return [
+                Playlist(uri=r.uri, name=r.name) for r in playlist_refs]
 
     playlists = deprecated_property(get_playlists)
     """

tests/core/test_playlists.py

@@ -23,12 +23,12 @@ class PlaylistsTest(unittest.TestCase):
         self.sp1 = mock.Mock(spec=backend.PlaylistsProvider)
         self.sp1.as_list.return_value.get.return_value = [
             self.plr1a, self.plr1b]
-        self.sp1.playlists.get.return_value = [self.pl1a, self.pl1b]
+        self.sp1.lookup.return_value.get.side_effect = [self.pl1a, self.pl1b]
 
         self.sp2 = mock.Mock(spec=backend.PlaylistsProvider)
         self.sp2.as_list.return_value.get.return_value = [
             self.plr2a, self.plr2b]
-        self.sp2.playlists.get.return_value = [self.pl2a, self.pl2b]
+        self.sp2.lookup.return_value.get.side_effect = [self.pl2a, self.pl2b]
 
         self.backend1 = mock.Mock()
         self.backend1.uri_schemes.get.return_value = ['dummy1']
@@ -73,7 +73,7 @@ class PlaylistsTest(unittest.TestCase):
         self.assertFalse(self.sp2.delete.called)
 
     def test_get_playlists_combines_result_from_backends(self):
-        result = self.core.playlists.playlists
+        result = self.core.playlists.get_playlists()
 
         self.assertIn(self.pl1a, result)
         self.assertIn(self.pl1b, result)