Adds object creation from spotify

Now includes functions to convert json to track, artist and album

playlist/models.py

@@ -1,12 +1,44 @@
 from django.db import models
 
+class ArtistManager(models.Manager):
+    def from_json(self, json):
+        try:
+            return Artist.objects.get(pk=json["id"])
+        except Artist.DoesNotExist:
+            keys = [f.name for f in Artist._meta.get_fields()]
+            subset = {key:json[key] for key in set(keys) & set(json.keys())}
+            artist = self.create(**subset)
+            return artist
+
 class Artist(models.Model):
+    def __str__(self):
+        return self.name
     id = models.CharField(primary_key=True, max_length=128)
     name = models.CharField(max_length=255)
     popularity = models.SmallIntegerField(null=True, blank=True)
-    genres = models.JSONField()
+    genres = models.JSONField(null=True)
+
+    objects = ArtistManager()
+
+class AlbumManager(models.Manager):
+    def from_json(self, json):
+        try:
+            return Album.objects.get(pk=json["id"])
+        except Album.DoesNotExist:
+            artists = []
+            for artist in json["artists"]:
+                artists.append(Artist.objects.from_json(artist))
+            del json["artists"]
+            keys = [f.name for f in Album._meta.get_fields()]
+            subset = {key:json[key] for key in set(keys) & set(json.keys())}
+            album = self.create(**subset)
+            for artist in artists:
+                album.artists.add(artist)
+            return album
 
 class Album(models.Model):
+    def __str__(self):
+        return self.name
     id = models.CharField(primary_key=True, max_length=128)
     name = models.CharField(max_length=255)
     artists = models.ManyToManyField(Artist)
@@ -14,10 +46,42 @@ class Album(models.Model):
     total_tracks = models.PositiveSmallIntegerField(null=True)
     image = models.ImageField(upload_to="albums/")
 
+    objects = AlbumManager()
+
+class TrackManager(models.Manager):
+    def get_queryset(self):
+        return super().get_queryset().filter(old=False)
+    def from_json(self, json):
+        artists = []
+        for artist in json["artists"]:
+            artists.append(Artist.objects.from_json(artist))
+        del json["artists"]
+
+        album = Album.objects.from_json(json["album"])
+        del json["album"]
+
+        keys = [f.name for f in Track._meta.get_fields()]
+        subset = {key:json[key] for key in set(keys) & set(json.keys())}
+        track = self.create(**subset)
+        track.album = album
+        for artist in artists:
+            track.artists.add(artist)
+        track.save()
+        return track
 
 class Track(models.Model):
+    def __str__(self):
+        s = f"'{self.name}'"
+        if self.artists.count() > 0:
+            artists = list(map(lambda a:a.name, self.artists.all()))
+            s += " by "
+            s += " & ".join(artists)
+            
+        if self.explicit:
+            s += " PARENTAL ADVISORY"
+        return s
     id = models.CharField(primary_key=True, max_length=128)
-    title = models.CharField(max_length=255)
+    name = models.CharField(max_length=255)
     artists = models.ManyToManyField(Artist)
     album = models.ForeignKey(Album, null=True, on_delete=models.SET_NULL)
 
@@ -25,6 +89,10 @@ class Track(models.Model):
     duration_ms = models.PositiveIntegerField(null=True)
     popularity = models.PositiveIntegerField(null=True)
 
-    banter = models.TextField()
+    banter = models.TextField(blank=True)
+
+    old = models.BooleanField(default=False)
+
+    objects = TrackManager()
 
 #class TrackFeatures(models.Model):