Django save image from url and connect with ImageField - django

Question

I have in models.py:
class Item(models.Model):
image_file = models.ImageField(upload_to='images')
image_url = models.URLField()
I want django automatically download and locally save image from image_url and "connect" it with image_file
How it should act:
I Paste https://docs.djangoproject.com/s/img/site/hdr_logo.gif
into image_url field in admin
Click "save"
In templates write <img src="{{ item.image_file.url }}">. It shows
image from my server, not djangoproject.com
What I've tried:
I've overwritten save method of Item class. I saved image locally via urllib, but I am stuck on connecting this saved image with image_file field

Answer 1

from django.core.files import File
import os
class Item(models.Model):
image_file = models.ImageField(upload_to='images')
image_url = models.URLField()
...
def get_remote_image(self):
if self.image_url and not self.image_file:
result = urllib.urlretrieve(self.image_url)
self.image_file.save(
os.path.basename(self.image_url),
File(open(result[0]))
)
self.save()
You can override the default save() method to automatically invoke get_remote_image().
See: https://docs.djangoproject.com/en/dev/topics/db/models/#overriding-model-methods

Answer 2

from django.db import models
from django.core.files import File
from urllib.request import urlopen
from tempfile import NamedTemporaryFile
class Item(models.Model):
image_file = models.ImageField(upload_to='images')
image_url = models.URLField()
...
def get_remote_image(self):
if self.image_url and not self.image_file:
img_temp = NamedTemporaryFile(delete=True)
img_temp.write(urlopen(self.image_url).read())
img_temp.flush()
self.image_file.save(f"image_{self.pk}", File(img_temp))
self.save()
This solution avoid any utf-8 errors received during url process.
It works only with python 3.6+ because the f string.
Check this link: https://twigstechtips.blogspot.com/2012/04/django-programmatically-saving-image.html

Answer 3

For python3
from django.core.files import File
from urllib import request
import os
class Item(models.Model):
image_file = models.ImageField(upload_to='images')
image_url = models.URLField()
...
def get_remote_image(self):
if self.image_url and not self.image_file:
result = request.urlretrieve(self.image_url)
self.image_file.save(
os.path.basename(self.image_url),
File(open(result[0], 'rb'))
)
self.save()
from here: http://stackoverflow.com/questions/17960942/attributeerror-module-object-has-no-attribute-urlretrieve

Answer 4

Python3
from django.db import models
from django.core.files import File
from urllib.request import urlopen
from tempfile import NamedTemporaryFile
class Item(models.Model):
image_file = models.ImageField(upload_to='images')
image_url = models.URLField()
def save(self, *args, **kwargs):
if self.image_url and not self.image_file:
img_temp = NamedTemporaryFile(delete=True)
img_temp.write(urlopen(self.image_url).read())
img_temp.flush()
self.image_file.save(f"image_{self.pk}", File(img_temp))
super(Item, self).save(*args, **kwargs)
It`s similar but with automated save 'image_file', when add 'image_url'