Can Django models use MySQL functions?

Question

Is there a way to force Django models to pass a field to a MySQL function every time the model data is read or loaded? To clarify what I mean in SQL, I want the Django model to

Answer 1

After deep search in the implementation of Django ORM,

I found that it can be solved by something like this:

class EncryptedField(models.BinaryField):
    @staticmethod
    def _pad(value):
        return value + (AES.block_size - len(value) % AES.block_size) * b('\x00')

    def _encrypt(self, data):
        if not data:
            return None
        return self.cipher.encrypt(self._pad(data.encode('utf8')))

    def _decrypt(self, data):
        if not data:
            return None
        return self.cipher.decrypt(force_bytes(data)).rstrip(b'\x00').decode('utf8')

    @property
    def cipher(self):
        return AES.new(KEY, mode=AES.MODE_CBC, IV=self._iv)

    def get_db_prep_value(self, value, connection, prepared=False):
        if value is not None:
            value = self._encrypt(value)
            if value:
                value = binascii.hexlify(value)
        return value

    def get_placeholder(self, value, compiler, connection):
        return 'unhex(%s)'