Postclass DescriptionVariationModelInline(admin.TabularInline):

class DescriptionVariationModelInline(admin.TabularInline): model= models.DescriptionVariationModel extra = 22 max_num = 22 line_numbering = 0 fields = ['line_number','context'] readonly_fields = ('line_number',) def line_number(self, obj): self.line_numbering += 1 return self.line_numbering