Create a file name instance in FileField.

Create a file name instance in FileField.

The upload_to attribute in FileField can be used to set the storage directory and name of the uploaded file. It can be a string or callable, for example, a method.

When the value of upload_to is set to a method, you can modify the name of the uploaded file. The method requires two parameters: instance and filename. instance is the Model instance to which the FileField belongs, and filename is the name of the uploaded file.

Example:

 def user_directory_path(instance, filename): # file will be uploaded to MEDIA_ROOT/user_<id>/<filename> return 'user_{0}/{1}'.format(instance.user.id, filename) class MyModel(models.Model): upload = models.FileField(upload_to=user_directory_path) 

When a class defines the _ call _ method, it can also be called like func, the upload_to value can also be a class that defines the _ call _ method.

For example, you need to add a timestamp to the file name based on the upload time:

import hashlib import os import time  from django.utils.deconstruct import deconstructible   @deconstructibleclass TimeStampFileName(object):   def __init__(self, path):     self.path = os.path.join(path, "%s%s")    def __call__(self, instance, filename):     extension = os.path.splitext(filename)[1]     data = "%s_%d"%(filename,int(time.time()))     file_hash = hashlib.sha1(data).hexdigest()     return self.path % (file_hash, extension)

The FileField in Model can be defined as follows:

class MyModel(models.Model):   upload = models.FileField(upload_to=TimeStampFileName('media/'), ) 

The example of the uploaded file name in the above custom FileField is all the content shared by the editor. I hope to give you a reference and support for the help house.