django:将url中的图像保存在另一个模型中

Question

class Item(models.Model):
    name = models.CharField(max_length = 200)
    image = models.ImageField(upload_to = 'read', blank=True)
    creative_url = models.CharField(max_length = 200)
    description = RichTextField()

    def save(self, *args, **kwargs):
        content = urllib2.urlopen(self.creative_url).read()
        self.image.save("test.jpg", File(content))
        super(Item, self).save(*args, **kwargs)

给出异常:'str'对象没有属性'name'

我试图按照这个答案(http://stackoverflow.com/questions/1393202/django-add-image-in-an-imagefield-from-image-url)但它没有帮助摆脱异常.

---

AttributeError at /admin/collection/item/1/ 'str' object has no attribute 'name' Request Method:    POST Request
URL:    http://127.0.0.1:8000/admin/collection/item/1/ Django
Version:    1.2.5 Exception Type:   AttributeError Exception Value:  'str'
object has no attribute 'name' Exception
Location:   D:\FF\django\core\files\base.py in _get_size, line 39 Python
Executable: C:\Python27\python.exe Python Version:  2.7.2 Python
Path:   ['D:\\FF',
'C:\\Python27\\lib\\site-packages\\django_social_auth-0.6.7-py2.7.egg',
'C:\\Python27\\lib\\site-packages\\python_openid-2.2.5-py2.7.egg',
'C:\\Python27\\lib\\site-packages\\oauth2-1.5.211-py2.7.egg',
'C:\\Python27\\lib\\site-packages\\httplib2-0.7.4-py2.7.egg',
'C:\\Python27\\lib\\site-packages\\selenium-2.20.0-py2.7.egg',
'C:\\Python27\\lib\\site-packages\\ipython-0.12-py2.7.egg',
'C:\\Python27\\lib\\site-packages\\django_localeurl-1.5-py2.7.egg',
'C:\\Python27\\lib\\site-packages\\pil-1.1.7-py2.7-win32.egg',
'C:\\Python27\\lib\\site-packages\\pip-1.1-py2.7.egg',
'C:\\Windows\\system32\\python27.zip', 'C:\\Python27\\DLLs',
'C:\\Python27\\lib', 'C:\\Python27\\lib\\plat-win',
'C:\\Python27\\lib\\lib-tk', 'C:\\Python27',
'C:\\Python27\\lib\\site-packages',
'c:\\python27\\lib\\site-packages'] Server time:    Tue, 24 Apr 2012
14:19:00 +0300

Answer 1

而不是File,你需要使用django.core.files.base.ContentFile

self.image.save("test.jpg", ContentFile(content), save=False)

File接受StringIO具有size属性的文件对象或对象,或者您需要手动设置a的size属性File或ImageFile使其工作w/StringIO:

s = StringIO()
s.write(urllib2.urlopen(self.creative_url).read())
s.size = s.tell()
self.image.save('test.jpg', File(s), save=False)

此外,请注意save=False内部self.image.save:默认情况下,save=True这将导致保存包含图像字段的实例.因此,save代码中的逻辑可能会遇到无限循环并达到最大递归深度.

Answer 2

尝试类似的东西:

(假设:以编程方式将图像保存到Django ImageField)

from django.db import models
from django.core.files.base import ContentFile
import urllib2
from PIL import Image
from StringIO import StringIO

class Item(models.Model):
    name = models.CharField(max_length=200)
    image = models.ImageField(upload_to='read', blank=True)
    creative_url = models.URLField(max_length=200)

    class Meta:
        verbose_name = "Item"
        verbose_name_plural = "Items"

    def download_image(self, url):
        input_file = StringIO(urllib2.urlopen(url).read())
        output_file = StringIO()
        img = Image.open(input_file)
        if img.mode != "RGB":
            img = img.convert("RGB")
        img.save(output_file, "JPEG")
        self.image.save(self.name+".jpg", ContentFile(output_file.getvalue()), save=False)

    def save(self, *args, **kwargs):
        self.download_image(self.creative_url)
        super(Item, self).save(*args, **kwargs)