我有两个简单的模型:
class UploadImage(models.Model):
Image = models.ImageField(upload_to="temp/")
class RealImage(models.Model):
Image = models.ImageField(upload_to="real/")
一种形式
class RealImageForm(ModelForm):
class Meta:
model = RealImage
我需要将文件从UploadImage保存到RealImage中。我怎么能这样做 下面的代码不起作用
realform.Image=UploadImage.objects.get(id=image_id).Image
realform.save()
Tnx寻求帮助。
答案 0 :(得分:28)
受Gerard解决方案的启发,我想出了以下代码:
from django.core.files.base import ContentFile
#...
class Example(models.Model):
file = models.FileField()
def duplicate(self):
"""
Duplicating this object including copying the file
"""
new_example = Example()
new_file = ContentFile(self.file.read())
new_file.name = self.file.name
new_example.file = new_file
new_example.save()
这实际上会通过在文件名中添加“_1”来重命名文件,以便原始文件和文件的新副本可以同时存在于磁盘上。
答案 1 :(得分:5)
虽然这已经很晚了,但我会解决这个问题,
class UploadImage(models.Model):
Image = models.ImageField(upload_to="temp/")
# i need to delete the temp uploaded file from the file system when i delete this model
# from the database
def delete(self, using=None):
name = self.Image.name
# i ensure that the database record is deleted first before deleting the uploaded
# file from the filesystem.
super(UploadImage, self).delete(using)
self.Image.storage.delete(name)
class RealImage(models.Model):
Image = models.ImageField(upload_to="real/")
# in my view or where ever I want to do the copying i'll do this
import os
from django.core.files import File
uploaded_image = UploadImage.objects.get(id=image_id).Image
real_image = RealImage()
real_image.Image = File(uploaded_image, uploaded_image.name)
real_image.save()
uploaded_image.close()
uploaded_image.delete()
# django model forms provides a reference to the associated model via the instance property
form.instance.Image = File(uploaded_image, os.path.basename(uploaded_image.path))
form.save()
uploaded_image.close()
uploaded_image.delete()
请注意,我确保upload_image文件已关闭,因为调用real_image.save()将打开文件并读取其内容。这是由ImageField实例使用的存储系统
处理的答案 2 :(得分:2)
尝试不使用表单即可。在不知道你得到的确切错误的情况下,我只能推测表单的clean()方法由于upload_to参数不匹配而引发错误。
这让我想到了下一点,如果你试图将图像从'temp /'复制到'real /',你将不得不做一些文件处理来自己移动文件(如果你有PIL则更容易) ):
import Image
from django.conf import settings
u = UploadImage.objects.get(id=image_id)
im = Image.open(settings.MEDIA_ROOT + str(u.Image))
newpath = 'real/' + str(u.Image).split('/', 1)[1]
im.save(settings.MEDIA_ROOT + newpath)
r = RealImage.objects.create(Image=newpath)
希望有帮助...
答案 3 :(得分:1)
我有同样的问题并且像这样解决了,希望它可以帮助任何人:
# models.py
class A(models.Model):
# other fields...
attachment = FileField(upload_to='a')
class B(models.Model):
# other fields...
attachment = FileField(upload_to='b')
# views.py or any file you need the code in
try:
from cStringIO import StringIO
except ImportError:
from StringIO import StringIO
from django.core.files.base import ContentFile
from main.models import A, B
obj1 = A.objects.get(pk=1)
# You and either copy the file to an existent object
obj2 = B.objects.get(pk=2)
# or create a new instance
obj2 = B(**some_params)
tmp_file = StringIO(obj1.attachment.read())
tmp_file = ContentFile(tmp_file.getvalue())
url = obj1.attachment.url.split('.')
ext = url.pop(-1)
name = url.pop(-1).split('/')[-1] # I have my files in a remote Storage, you can omit the split if it doesn't help you
tmp_file.name = '.'.join([name, ext])
obj2.attachment = tmp_file
# Remember to save you instance
obj2.save()
答案 4 :(得分:-2)
更新Gerard的解决方案以通用方式处理它:
try:
from cStringIO import StringIO
except ImportError:
from StringIO import StringIO
from django.core.files.base import ContentFile
init_str = "src_obj." + src_field_name + ".read()"
file_name_str = "src_obj." + src_field_name + ".name"
try:
tmp_file = StringIO(eval(str(init_str)))
tmp_file = ContentFile(tmp_file.getvalue())
tmp_file.name = os.path.basename(eval(file_name_str))
except AttributeError:
tmp_file = None
if tmp_file:
try:
dest_obj.__dict__[dest_field_name] = tmp_file
dest_obj.save()
except KeyError:
pass
使用变量: