serializers.py 文件源码

def validate(self, attrs):
        attrs = super(BatchRequestSerializer, self).validate(attrs)

        files_in_use = []
        for batch in attrs['batch']:
            if 'attached_files' not in batch:
                continue

            attached_files = batch['attached_files']
            if isinstance(attached_files, dict):
                files_in_use.extend(attached_files.values())
            elif isinstance(attached_files, list):
                files_in_use.extend(attached_files)
            else:
                raise ValidationError({'attached_files': 'Invalid format.'})

        missing_files = set(files_in_use) - set(self.get_files().keys())
        if missing_files:
            raise ValidationError('Some of files are not provided: {}'.format(', '.join(missing_files)))

        return attrs