將圖片處理移至信號：模型設計的最佳實踐

from django.contrib.auth.models import User
from django.db import models
from mixins import WebPImageModelMixin

class Profile(WebPImageModelMixin, models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE, related_name="profile")
    photo = models.ImageField(upload_to="profile_photos/", blank=True, null=True)
    bio = models.TextField(max_length=200, null=True)
    location = models.CharField(max_length=50, null=True)
    is_client = models.BooleanField(default=True, null=True)
    is_freelancer = models.BooleanField(default=False, null=True)
    freelancer_verified = models.BooleanField(default=False, null=True)

    def __str__(self):
        return f"{self.user.username}'s Profile"

from django.db.models.signals import pre_save
from django.dispatch import receiver
from users.models import Profile
from services.models import ServiceImage

@receiver(pre_save, sender=Profile)
def process_profile_image(sender, instance, **kwargs):
    if instance.photo and not getattr(instance, '_is_photo_processed', False):
        instance._is_photo_processed = True
        instance.process_and_upload_image(instance.photo, "profile_photos/")

@receiver(pre_save, sender=ServiceImage)
def process_service_image(sender, instance, **kwargs):
    if instance.image and not getattr(instance, '_is_image_processed', False):
        instance._is_image_processed = True
        instance.process_and_upload_image(instance.image, "service_images/")

from django.db import models
from utils.image_processing import convert_and_upload_to_webp

class WebPImageModelMixin(models.Model):
    class Meta:
        abstract = True

    def process_and_upload_image(self, image_file, folder_name):
        new_image_path = convert_and_upload_to_webp(image_file, folder_name)
        self.photo.name = new_image_path