Вот полное решение для вас, используя форму. Я использовал админские представления для этого:
class MyInventoryItemForm(forms.ModelForm):
class Meta:
model = InventoryItem
exclude = ['thumbnail', 'price', 'active']
def clean_photo(self):
import StringIO
image_field = self.cleaned_data['photo']
photo_new = StringIO.StringIO(image_field.read())
try:
from PIL import Image, ImageOps
except ImportError:
import Image
import ImageOps
image = Image.open(photo_new)
# ImageOps compatible mode
if image.mode not in ("L", "RGB"):
image = image.convert("RGB")
image.thumbnail((200, 200), Image.ANTIALIAS)
image_file = StringIO.StringIO()
image.save(image_file, 'png')
image_field.file = image_file
return image_field
Моя модель инвентаря выглядит так:
class InventoryItem(models.Model):
class Meta:
ordering = ['name']
verbose_name_plural = "Items"
def get_absolute_url(self):
return "/products/{0}/".format(self.slug)
def get_file_path(instance, filename):
if InventoryItem.objects.filter(pk=instance.pk):
cur_inventory = InventoryItem.objects.get(pk=instance.pk)
if cur_inventory.photo:
old_filename = str(cur_inventory.photo)
os.remove(os.path.join(MEDIA_ROOT, old_filename))
ext = filename.split('.')[-1]
filename = "{0}.{1}".format(uuid.uuid4(), ext)
return os.path.join('inventory', filename)
#return os.path.join(filename)
def admin_image(self):
return '<img height="50px" src="{0}/{1}"/>'.format(MEDIA_URL, self.photo)
admin_image.allow_tags = True
photo = models.ImageField(_('Image'), upload_to=get_file_path, storage=fs, blank=False, null=False)
thumbnail = models.ImageField(_('Thumbnail'), upload_to="thumbnails/", storage=fs, blank=True, null=True)
....
Я прекратил перезаписывать функцию сохранения модели вместо того, чтобы сохранить фотографию и большой палец вместо простого изменения размера фотографии:
def save(self):
# Save this photo instance first
super(InventoryItem, self).save()
from PIL import Image
from cStringIO import StringIO
from django.core.files.uploadedfile import SimpleUploadedFile
# Set our max thumbnail size in a tuple (max width, max height)
THUMBNAIL_SIZE = (200, 200)
# Open original photo which we want to thumbnail using PIL's Image object
image = Image.open(os.path.join(MEDIA_ROOT, self.photo.name))
if image.mode not in ('L', 'RGB'):
image = image.convert('RGB')
image.thumbnail(THUMBNAIL_SIZE, Image.ANTIALIAS)
# Save the thumbnail
temp_handle = StringIO()
image.save(temp_handle, 'png') # image stored to stringIO
temp_handle.seek(0) # sets position of file to 0
# Save to the thumbnail field
suf = SimpleUploadedFile(os.path.split(self.photo.name)[-1],
temp_handle.read(), content_type='image/png') # reads in the file to save it
self.thumbnail.save(suf.name+'.png', suf, save=False)
#Save this photo instance again to save the thumbnail
super(InventoryItem, self).save()
Оба отлично работают, хотя в зависимости от того, что вы хотите сделать:)