在 Model.py 中使用模型字段值

Question

我在 django 中有模型，我想使用此帐户模型中的用户名值来寻址 ImageField 我怎样才能做到这一点？

class Account(models.Model):
    nickname = models.CharField(max_length=150)
    username = models.CharField(max_length=70)
    password = models.CharField(max_length=70)
    email = models.EmailField(max_length=70)

    avatar = models.ImageField(upload_to = f'userdata/{username}/avatar/' ,default= MEDIA_ROOT + 'default/img/avatar.png')

Answer 1

使用可调用：

class Account(models.Model):
    nickname = models.CharField(max_length=150)
    username = models.CharField(max_length=70)
    password = models.CharField(max_length=70)
    email = models.EmailField(max_length=70)

    def avatar_path(self, filename):
        return f'userdata/{self.username}/avatar/{filename}'

    avatar = models.ImageField(
        upload_to=avatar_path, default=MEDIA_ROOT + 'default/img/avatar.png'
    )

Answer 2

使用 upload_to 作为可调用的，例如函数。 作为参考，请检查此gfg页面

def user_directory_path(instance, filename):
    return f'userdata/{instance.username}/avatar/{filename}'

class Account(models.Model):
    nickname = models.CharField(max_length=150)
    username = models.CharField(max_length=70)
    password = models.CharField(max_length=70)
    email = models.EmailField(max_length=70)

    avatar = models.ImageField(upload_to=user_directory_path, default=MEDIA_ROOT + 'default/img/avatar.png')