Custom FileField Bawaan Django untuk Membatasi Jenis File Image dan Sizenya

models.py

from .fields import ImageFieldRestrict
class Photo(models.Model):
    user = models.ForeignKey('auth.User', related_name="user_photos")
    booklet = models.ForeignKey(Booklet, related_name="photos")
    about = models.CharField(max_length=100)
    pic = ImageFieldRestrict(upload_to='photo/%Y/%m/%d')
    created = models.DateTimeField(auto_now_add=True)
    def __str__(self):
        return self.booklet.title
    class Meta:
        ordering = ('-created',)