models.py 文件源码

def update_zipfile(sender, instance, **kwargs):
    """ Delete zip file on pre_save. This is needed in case of updation of 
        zip file, where the older file should be deleted from the location"""
    if instance.pk:
        details = SponsorProjectDetailsSubFields.objects.get(pk=instance.pk)
        if details.zip_file and details.zip_file.url != instance.zip_file.url:
            storage, path = details.zip_file.storage, details.zip_file.path
            storage.delete(path)