Use a signal to update Artist slug

label/models.py

@@ -1,14 +1,11 @@
 from django.db import models
+from django.db.models.signals import pre_save
+from django.dispatch.dispatcher import receiver
 from django.template.defaultfilters import slugify
 
 
 class Artist(models.Model):
-    """ An Artist of the label.
-
-    Attributes: 
-        name: project / band name
-        image: image file associated with this project
-    """
+    """ An Artist of the label. """
     name = models.CharField(max_length = 64)
     slug = models.SlugField()
     image = models.ImageField(upload_to = "artists")
@@ -20,15 +17,15 @@ class Artist(models.Model):
     def __str__(self):
         return self.name
 
-    def save(self, *args, **kwargs):
-        self.slug = slugify(self.name)
-        super().save(*args, **kwargs)
-
     class Meta(object):
         ordering = ("name",)
 
+@receiver(pre_save, sender = Artist)
+def _artist_pre_save(sender, instance, **kwargs):
+    instance.slug = slugify(instance.name)
 
-rel_types_hint = "full-length (0), EP (1), Split (2), Démo (3)"
+
+REL_TYPES_HINT = "full-length (0), EP (1), Split (2), Démo (3)"
 
 class Release(models.Model):
     """ A release (album, EP, ...) of the label.
@@ -47,7 +44,7 @@ class Release(models.Model):
     ident = models.IntegerField()
     title = models.CharField(max_length = 256)
     contributors = models.ManyToManyField(Artist)
-    release_type = models.IntegerField(default = 0, help_text = rel_types_hint)
+    release_type = models.IntegerField(default = 0, help_text = REL_TYPES_HINT)
     cover = models.ImageField(upload_to = "releases")
     year = models.IntegerField()
     embed = models.TextField(blank = True)
@@ -57,4 +54,4 @@ class Release(models.Model):
         return self.title
 
     class Meta(object):
-        ordering = ("ident", "title")
+        ordering = ("ident", "title")

label/tools.py

@@ -1,3 +1,4 @@
+
 def get_catalog_tag_from_id(ident):
     return "IDRE{:0>3d}".format(ident)