Re: ImageField always calling update_dimensions_fields

What I see is that when I load my page, it calls update_dimension_fields for every image. The model is simple.

class Photo(models.Model):
    width = models.PositiveIntegerField(blank=True, null=True, editable=False, default="0")
    height = models.PositiveIntegerField(blank=True, null=True, editable=False, default="0")
    image = ImageField(upload_to=upload_to, width_field='width', height_field='height')
    user = models.ForeignKey(settings.AUTH_USER_MODEL, related_name="uploaded_photos")
    title = models.CharField(max_length=255)
    slug = extension_fields.AutoSlugField(populate_from='title', blank=True)
    caption = models.CharField(max_length=255, blank=True)
    date_added = models.DateTimeField(default=timezone.now)

class PhotoCollection(models.Model):
    name = models.CharField('name', max_length=250)
    slug = extension_fields.AutoSlugField(populate_from='name', blank=True)
    description = models.TextField(blank=True)
    user = models.ForeignKey(settings.AUTH_USER_MODEL, related_name="uploaded_collections")
    date_added = models.DateTimeField(default=timezone.now)
    photos = models.ManyToManyField('photos.Photo', related_name='collections', blank=True)

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