Case de données dans Django

**jeanpierrea** · 15/11/2018, 14h18

j'ai essaier de créer directement une base de donnée dans django pas la créer on posgres puis la connecté mais j'ai fais une erreur ou un oublie que je trouve pas aidé moi on me donné la ligne de l'erreur et le code d'erreur voici l'erreur et le code

Code :

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from django.db import models
 
class Artist(models.Model):
	name= models.CharField(max_length=200, unique=True)
 
 
class Contact(models.Model):
	email= models.EmailField(max_length=100)
	name= models.CharField(max_length=200)
 
 
class Album(models.Model):
	reference=models.IntegerField(null=True)
	created_at= models.DateTimeField(auto_now_add=True)
	available= models.BooleanField(default=True)
	title = models.CharField(max_length=200)
	picture=models.URLField()
	artists=models.ManyToManyField(Artist,related_name='albums', blank=True)
 
 
class Booking(models.Model):
	created_at= models.DateTimeField(auto_now_add=True)
	contacted = models.BooleanField(default=False)
	contact = models.ForeignKey(Contact, on_delete=models.CASCADE)
	album=models.OneToOneField(Album)

Erreur :

File "manage.py", line 15, in <module>
    execute_from_command_line(sys.argv)
  File "C:\disquaire\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "C:\disquaire\lib\site-packages\django\core\management\__init__.py", line 357, in execute
    django.setup()
  File "C:\disquaire\lib\site-packages\django\__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "C:\disquaire\lib\site-packages\django\apps\registry.py", line 112, in populate
    app_config.import_models()
  File "C:\disquaire\lib\site-packages\django\apps\config.py", line 198, in import_models
    self.models_module = import_module(models_module_name)
  File "C:\Python37-32\lib\importlib\__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "C:\disquaire\disquaire_project\store\models.py", line 21, in <module>
    class Booking(models.Model):
  File "C:\disquaire\disquaire_project\store\models.py", line 25, in Booking
    album=models.OneToOneField(Album)
TypeError: __init__() missing 1 required positional argument: 'on_delete'

merci