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class Product(models.Model):
name = models.CharField(max_length=5)
vat_rate = models.DecimalField(max_digits=5, decimal_places=2)
amount = models.IntegerField(default=0, primary_key=True)
Amount is set as primary key
, which means that the database will only allow 1 record per value of amount.
BUT, you’ve also set a default
value of 0, so your DB can only create 1 record with amount = 0, whenever the amount value is not provided.
You must decide what you want. If the amount uniqueness matters, then remove default=0 and put null=True, blank=True, for example.
Source:stackexchange.com