Django save image from url and connect with ImageField

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:

1. I Paste https://docs.djangoproject.com/s/img/site/hdr_logo.gif into image_url field in admin
2. Click "save"
3. 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