django 实现手动存储文件到model的FileField

通过POST请求，上传了文件，想要将文件存储在模型的FileField中

request.FILES中的值均为UploadedFile类文件对象

表单上传的文件对象存储在类字典对象request.FILES中，表单格式需为multipart/form-data

FieldFile.save(name, content, save=True)

name:命名文件名

content：必须是django.core.files.File或django.core.files.base.ContentFile二者之一的一个实例

from django.core.files.base import ContentFile
#from django.core.files import File


photo=request.FILES.get('file','')
user=UserProfile.objects.get(id=uid)
if photo: 
 file_content = ContentFile(photo.read()) #创建ContentFile对象
 #file_content = File(photo.read()) #创建File对象
 user.photo.save(photo.name, file_content) #保存文件到user的photo域
 user.save()

补充知识：python-ContentFile未保存在Django模型FileField中

在我的Django模型中将字符串另存为文件时,我遇到了问题,因为每当我尝试取回数据时,都会给我一个ValueError(“属性没有关联的文件”).

详细信息如下：

模型：

class GeojsonData(models.Model):
dname = models.CharField(max_length=200, unique=True)
gdata = models.FileField(upload_to='data')
def __str__(self):
 return self.dname

保存数据的代码：

cf = ContentFile(stringToBeSaved)
gj = GeojsonDatua(dname = namevar, gdata = cf)
gj.save()

尝试读取数据的代码：

def readGeo(data):
 f = GeojsonData.objects.all().get(id=data.id).gdata
 f.open(mode ='rb')
 geo = f.read()
 return geo

追溯：

File "C:\Python\Python36-32\lib\site-packages\django\core\handlers\exception.py" in inner
41. response = get_response(request)

File "C:\Python\Python36-32\lib\site-packages\django\core\handlers\base.py" in _get_response
187. response = self.process_exception_by_middleware(e, request)

File "C:\Python\Python36-32\lib\site-packages\django\core\handlers\base.py" in _get_response
185. response = wrapped_callback(request, *callback_args, **callback_kwargs)

File "C:\Python\Python36-32\lib\site-packages\django\contrib\auth\decorators.py" in _wrapped_view
23. return view_func(request, *args, **kwargs)

File "C:\app\views.py" in mapa
80. geostr = app.readGeo.readGeo(d)

File "C:\app\readGeo.py" in readGeo
6. f.open(mode ='rb')

File "C:\Python\Python36-32\lib\site-packages\django\db\models\fields\files.py" in open
80. self._require_file()

File "C:Python\Python36-32\lib\site-packages\django\db\models\fields\files.py" in _require_file
46. raise ValueError("The '%s' attribute has no file associated with it." % self.field.name)

Exception Type: ValueError at /app/map/1
Exception Value: The 'gdata' attribute has no file associated with it.

解决方法:

您需要将ContentFile另存为实际文件.而不是直接将其分配给该字段,您应该调用该字段的save方法并将其传递给：

gj = GeojsonDatua(dname = namevar)
gj.gdata.save('myfilename', cf)

参见the docs.

另请注意,如果您始终像这样创建gdata字段,则可能根本就不需要FileField.也许改用TextField.