Removed superfluous mptt requirement

api/config/settings/common.py

@@ -57,7 +57,6 @@ THIRD_PARTY_APPS = (
     'taggit',
     'rest_auth',
     'rest_auth.registration',
-    'mptt',
     'dynamic_preferences',
     'django_filters',
     'cacheops',

api/funkwhale_api/playlists/migrations/0001_initial.py

@@ -4,7 +4,6 @@ from __future__ import unicode_literals
 from django.db import migrations, models
 from django.conf import settings
 import django.utils.timezone
-import mptt.fields
 
 
 class Migration(migrations.Migration):
@@ -34,7 +33,7 @@ class Migration(migrations.Migration):
                 ('tree_id', models.PositiveIntegerField(db_index=True, editable=False)),
                 ('position', models.PositiveIntegerField(db_index=True, editable=False)),
                 ('playlist', models.ForeignKey(to='playlists.Playlist', related_name='playlist_tracks', on_delete=models.CASCADE)),
-                ('previous', mptt.fields.TreeOneToOneField(null=True, to='playlists.PlaylistTrack', related_name='next', blank=True, on_delete=models.CASCADE)),
+                ('previous', models.OneToOneField(null=True, to='playlists.PlaylistTrack', related_name='next', blank=True, on_delete=models.CASCADE)),
                 ('track', models.ForeignKey(to='music.Track', related_name='playlist_tracks', on_delete=models.CASCADE)),
             ],
             options={

api/funkwhale_api/playlists/models.py

 from django.db import models
 from django.utils import timezone
 
-from mptt.models import MPTTModel, TreeOneToOneField
-
 from funkwhale_api.common import fields
 
 
@@ -28,18 +26,10 @@ class PlaylistTrack(MPTTModel):
         'music.Track',
         related_name='playlist_tracks',
         on_delete=models.CASCADE)
-    previous = TreeOneToOneField(
-        'self',
-        blank=True,
-        null=True,
-        related_name='next',
-        on_delete=models.CASCADE)
+    index = models.PositiveIntegerField(null=True)
     playlist = models.ForeignKey(
         Playlist, related_name='playlist_tracks', on_delete=models.CASCADE)
 
-    class MPTTMeta:
-        level_attr = 'position'
-        parent_attr = 'previous'
-
     class Meta:
-        ordering = ('-playlist', 'position')
+        ordering = ('-playlist', 'index')
+        unique_together = ('playlist', 'index')

api/requirements/base.txt

@@ -33,7 +33,6 @@ musicbrainzngs==0.6
 youtube_dl>=2017.12.14
 djangorestframework>=3.7,<3.8
 djangorestframework-jwt>=1.11,<1.12
-django-mptt>=0.9,<0.10
 google-api-python-client>=1.6,<1.7
 arrow>=0.12,<0.13
 persisting-theory>=0.2,<0.3