覆盖保存django方法

from django.db import models

class UserProfile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    profile_picture = models.ImageField(upload_to='profile_pics/')
    password = models.CharField(max_length=128)

def update_profile_picture(user_profile, new_picture):
    # 删除旧图片（如果存在）
    if user_profile.profile_picture:
        user_profile.profile_picture.delete(save=False)
    
    # 更新头像字段
    user_profile.profile_picture = new_picture
    user_profile.save()

def update_password(user_profile, new_password):
    user_profile.password = new_password  # 这不会直接保存密码，只是设置明文密码
    user_profile.save()  # 这会触发密码的哈希和存储

def update_password(user_profile, new_password):
    user_profile.set_password(new_password)
    user_profile.save()