Django admin: make field editable in add but not edit

Question

I\'ve got a model similar to this:

class Product(models.Model):
    third_party_id = models.CharField(max_length=64, blank=False, unique=True)

Answer 1

Do not set self.readonly_fields to avoid thread issues. Instead override get_readonly_fields method:

def get_readonly_fields(self, request, obj=None):
    if obj: # obj is not None, so this is an edit
        return ['third_party_id',] # Return a list or tuple of readonly fields' names
    else: # This is an addition
        return []