code: def init(self, ca, csr, **kwargs):
          
  
          c = self.model(ca=ca)
          c.x509, csr = self.sign_cert(ca, csr, **kwargs)
          c.csr = csr.public_bytes(Encoding.PEM).decode('utf-8')
          c.save()
  
          post_issue_cert.send(sender=self.model, cert=c)
          return c
docs: Create a signed certificate from a CSR and store it to the database.
  
          All parameters are passed on to :py:func:`Certificate.objects.sign_cert()
          <django_ca.managers.CertificateManager.sign_cert>`.