TranslateSerializer

# https://groups.google.com/forum/#!topic/django-rest-framework/WTZ0H6dyJe4

class TranslateSerializer(serializers.ModelSerializer):
    def __init__(self, *args, **kwargs):
        super(TranslateSerializer, self).__init__(*args, **kwargs)
        self.translate_fields = getattr(self.Meta, 'translate_fields', ())
        if kwargs.get('context', None):
            self.lang = utils.get_request_language(kwargs['context'].get('request', None))

    def to_native(self, obj):
        # Exclude ALWAYS language specific fields
        for language in settings.LANGUAGES:
            if language[0] != 'en':
                for field in self.translate_fields:
                    key = field + '_' + language[0]
                    if self.fields.get(key):
                        self.fields.pop(key)

        ret = super(serializers.ModelSerializer, self).to_native(obj)

        # Get current language and give the fields
        if self.lang != 'en':
            for field in self.translate_fields:
                trans = getattr(obj, field + "_" + self.lang)
                if trans:
                    ret[field] = trans
        return ret

    def from_native(self, data, files):
        instance = getattr(self, 'object', None)
        if self.lang != 'en':
            for field in self.translate_fields:
                value = data.get(field) or None
                if value:
                    data[field + "_" + self.lang] = value
                    # If is instance (existent object), set the original attr
                    data[field] = getattr(instance, field, data[field])

        ret = super(serializers.ModelSerializer, self).from_native(data, files)
        return ret

# That's it. So, let's say I have a model Tag with name and name_es attributes among others. I can use this now:

class ProductTagSerializer(TranslateSerializer):
    class Meta:
        model = ProductTag
        translate_fields = ('name',)