Custom fields serialisation & deserialisation

[nikhildigde]

Hi,
I am trying to create a custom field to implement client side encryption. I am able to perform serialisation during save, however I dont see a way to deserialise the data after a find (decrypt it). Is this possible by some means?

This is how I created the custom field

`class EncryptedFieldType(str):

@classmethod
def __get_validators__(cls):
    yield cls.validate

@classmethod
def validate(cls, v):
    if isinstance(v, bytes):  # Handle data coming from MongoDB
        print("In isinstance(v, bytes) ...")
        return "hello"
    if not isinstance(v, str):
        raise TypeError("string required")
    if not v.isascii():
        raise ValueError("Only ascii characters are allowed")
    return v

@classmethod
def __bson__(cls, v) -> str:
    print("In __bson__")
    return "*******"

class CollectionWithEncField(Model):
encrypted_field: EncryptedFieldType`

[nikhildigde]

I just figured that I can use the below

def validate(cls, v):
return decrypt(v)