On 13/12/2013 9:13pm, Hervé Edorh wrote:
Hi, I have a problem with a charfield foreign key. this my modelclass Region(models.Model): """ Class décrivant la table Region """ code_region = models.CharField(max_length=15, primary_key=True) name = models.CharField(max_length=25,null=True,blank=True) class Departement(models.Model): """ Class décrivant la table Département """ code_dept = models.CharField(max_length=15, primary_key=True) name = models.CharField(max_length=25,null=True,blank=True) region = models.ForeignKey(Region, null=True,blank=True) when i sync the database i have this error django.contrib.contenttypes.models.DoesNotExist: ContentType matching query does not exist. what is the meaning of this error and how can i solve it?
It is generally unconventional to have primary keys which have business meaning. To solve the problem remove 'primary_key=True' from both classes and rely on Django to give them their primary keys. You will have to migrate the tables accordingly or delete them and sync again.
If necessary you can add a unique constraint to the code_region and code_dept columns to ensure duplicates don't happen. unique=True
hth Mike
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