python之通过 Django Admin 将图像上传到 ImageField 时出错

尝试通过 Django 管理面板上传图片时出现错误。模型是:

fs = FileSystemStorage(location='/media') 
 
class Picture(models.Model): 
    picture_path = models.ImageField(upload_to=fs, blank=True) 
    hunter_ID = models.ForeignKey(User, 
                                  on_delete=models.CASCADE,) 
    bounty_ID = models.ForeignKey('bountyhunt.Bounty', 
                                  on_delete=models.CASCADE,) 
    winner = models.BooleanField(default=False) 
    example_pic = models.BooleanField(default=False) 
 
    def __str__(self): 
        return self.picture_path 

我得到的错误是:

TypeError at /admin/hunt/picture/add/ 
__str__ returned non-string (type ImageFieldFile) 
Request Method: POST 
Request URL:    http://127.0.0.1:8000/admin/hunt/picture/add/ 
Django Version: 1.9.6 
Exception Type: TypeError 
Exception Value:     
__str__ returned non-string (type ImageFieldFile) 
Exception Location: /Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/django/utils/encoding.py in force_text, line 76 
Python Executable:  /Library/Frameworks/Python.framework/Versions/3.5/bin/python3 
Python Version: 3.5.1 
Python Path:     
['/Users/michael/Documents/phoboh', 
 '/Library/Frameworks/Python.framework/Versions/3.5/lib/python35.zip', 
 '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5', 
 '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/plat-darwin', 
 '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/lib-dynload', 
 '/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages'] 

有什么想法吗？

请您参考如下方法:

如错误所示，问题 ID 与您的 Picture 模型的 __str__ 方法有关。它不是返回一个字符串，而是返回一个 ImageFieldFile 对象。

将其更改为返回一个字符串 - 例如，

def __str__(self): 
    return str(self.picture_path) 

或:

def __str__(self): 
    return self.picture_path.name