Serializer Field Meta validators

[phi...@futrli.com]

Hi all,

I'm trying to add a list of validators to a subclass of rest_framework.fields.Field.

I would prefer to add the validators to the field declaration, rather than every place it is used.

Ideally, I would like to be able to declare the Field similarly a Serializer, e.g:

class MyField(rest_framework.fields.Field):

    class Meta:

        validators = (

            my_validation_function,

        )

However, it looks like the Meta class is only used in subclasses of Serializer, and not in subclasses of Field.

Adding the validators during __init__ is pretty ugly:

class MyField(rest_framework.fields.Field):

    def __init__(self, read_only=False, write_only=False, required=None, default=empty, initial=empty, source=None,

                 label=None, help_text=None, style=None, error_messages=None, validators=None, **kwargs):

        if validators is None:

            validators = []

        else:

            validators = list(validators)

        default_validators = (

            my_validator,

        )

        validators.extend(default_validators)

        super().__init__(read_only, write_only, required, default, initial, source, label, help_text, style,

                         error_messages, validators, **kwargs)

Is there a better way to add a list of validators to a field inside the declaration of the field?

Thanks in advance for any help,

Phil Woods

[Xavier Ordoquy]

Hi,

DRF fields adds the validators during the init rather than setting them on Meta.

That help with heritage.

You can see how this works at https://github.com/encode/django-rest-framework/blob/master/rest_framework/fields.py#L799-L802

Hope this helps,

Regards,

Xavier Ordoquy,

Linovia.

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[phi...@futrli.com]

Aah, I didn't think about updating the validators after calling super().__init__, that's much nicer, thanks!

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