serializers.py 文件源码

def get_fields(self):
        """
        Adds invitation_hash field in create action only if registration is
        disabled
        """
        request = self.context.get('request')
        ret = super(UserSerializer, self).get_fields()

        if not request:
            return ret

        if request.method == 'POST' and \
                bool(User.objects.all().count() is not 0) and \
                not settings.VAULTIER.get('registration_allow'):
            ret['invitation_hash'] = serializers.CharField(write_only=True,
                                                           required=True)
        return ret