Add support for MongoDB BinaryField

[danaki]

Here's what works for me:

class BinaryField(BaseField):
    def __init__(self, subtype=None, **kwargs):
        self.subtype = subtype
        super(BinaryField, self).__init__(**kwargs)

    def __set__(self, instance, value):
        if isinstance(value, (str, unicode)):
            kwargs = {}
            if not self.subtype is None:
                kwargs = {'subtype': self.subtype}
            value = pymongo.binary.Binary(value, **kwargs)

        instance._data[self.field_name] = value

    def _jsonschema_type(self):
        return 'string'

    def for_python(self, value):
        try:
            return pymongo.binary.Binary(value)
        except Exception, e:
            raise ShieldException('Invalid Binary', self.field_name, value)

    def for_json(self, value):
        return str(value)

    def validate(self, value):
        if not isinstance(value, pymongo.binary.Binary):
            try:
                kwargs = {}
                if not self.subtype is None:
                    kwargs = {'subtype': self.subtype}
                value = pymongo.binary.Binary(value, **kwargs)
            except Exception, e:
                raise ShieldException('Invalid Binary', self.field_name, value)
        return value

[j2labs]

If you submit a pull request, I'd be happy to take this.

[bdickason]

@danaki is this still a feature you'd like to see supported? @j2labs I know you have some Mongo stuff going on in /contrib, is this still relevant?

[j2labs]

I could see it being useful. I'd be happy to have some more mongo'ish
support in contrib, but I think it should be thought of as bson stuff
instead, since that's the library where this stuff lives AND bson has no
database knowledge, just like Schematics.

Full bson support would be superb. I'm not sure what that would look like
though. Perhaps the output from to_native could be fed into a call for
bson conversion, or maybe something more clever.

But, let's move it to contrib if we do anything new here.

On Wed, Sep 25, 2013 at 6:22 PM, Brad Dickason notifications@github.comwrote:

@danaki https://github.com/danaki is this still a feature you'd like to
see supported? @j2labs https://github.com/j2labs I know you have some
Mongo stuff going on in /contrib, is this still relevant?

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