fields.py 文件源码

def deconstruct(self):
        name, path, args, kwargs = super(S3FileField, self).deconstruct()

        if self.upload_to != '':
            kwargs['upload_to'] = self.upload_to

        if self.storage != default_storage:
            kwargs['storage'] = self.storage

        if kwargs.get('max_length') == 200:
            del kwargs['max_length']

        return name, path, args, kwargs