Uploading Profile Image using Django ModelForm - django

I've looked around at related questions, but none of the answers seem to work. I'm trying to upload a profile image for a user and have it replace (overwrite) the current image. Upon saving the image I want to change the filename to the user id. In it's current form the image will upload, but it won't replace the existing image (e.g. it'll be saved as 2_1.png).
class PhotoForm(forms.ModelForm):
def save(self):
content_type = self.cleaned_data['photo'].content_type.split('/')[-1]
filename = '%d.%s' % (self.instance.user.id, content_type)
instance = super(PhotoForm, self).save(commit=False)
instance.photo = SimpleUploadedFile(filename, self.cleaned_data['photo'].read(), content_type)
instance.save()
return instance
class Meta:
model = UserProfile
fields = ('photo',)
def photo_form(request):
if request.method == 'POST':
form = PhotoForm(data=request.POST, file=request.FILES, instance=request.user.get_profile())
if form.is_valid():
form.save()
else:
form = PhotoForm()
return render(request, 'photo_form.html', {'form': form})

def photo_form(request):
if request.method == 'POST':
form = PhotoForm(data=request.POST, file=request.FILES, instance=request.user.get_profile())
if form.is_valid():
handle_uploaded_file(request.FILES['<name of the FileField in models.py>'])
def handle_uploaded_file(f):
dest = open('/path/to/file', 'wb') # write should overwrite the file
for chunk in f.chunks():
dest.write(chunk)
dest.close()
check here: https://docs.djangoproject.com/en/dev/topics/http/file-uploads/
If that doesn't work, I suppose you could just use os.system to delete the file if the form is accepted. That probably wouldn't be that great of a solution, but it should work.

Related

django adding multiple model image instances using form

I want to save 400 picture to my Image model using one single file field and i dont know how tp get each image from the form and create an instance on the Image model
here is my model function:
class Image(models.Model):
image = models.ImageField(null=True, blank=True)
and here is my form:
class AddImageForm(forms.ModelForm):
image = forms.FileField(widget=forms.FileInput(attrs={'class':'form-control','multiple':'true'}))
class Meta:
model = Image
fields = ['image']
and here is my view which i know is wrong just to make sure i share everything:
def imagesform(request):
form = AddImageForm()
if request.method == 'POST':
if form.is_valid():
for i in form['image']:
Image.objects.create(image=i)
context = {'form':form}
return render(request, 'members/imagesform.html', context)
Multiple file uploads can be a pain to implement, but you're almost there! From what I see, the only thing that's missing is that you should instantiate your form with the request.POST and request.FILES arguments:
def imagesform(request):
if request.method == 'POST':
form = AddImageForm(request.POST, request.FILES)
if form.is_valid():
for i in form['image']:
Image(image=i).save()
form = AddImageForm()
context = {'form':form}
return render(request, 'members/imagesform.html', context)
Also, make you sure you add the attribute enctype="multipart/form-data" to your <form> tag.

Django - uploading image to database raises IntegrityError

I'm trying to allow users to upload an image. When users are first created, they are given a unique ID / primary key. When users upload an image, I want to save that image in a folder depending on what the users unique ID is. For example, if the users unique ID is 1, I want to save it in
1/uploadedPhotos/imageName
This is my model:
def get_file_path(instance, filename):
return os.path.join('%s/uploadedPhotos' % instance.user_id, filename)
class UserImages(models.Model):
user = models.ForeignKey(User)
photo = models.ImageField(upload_to=get_file_path)
and this is my form:
class UploadImageForm(forms.ModelForm):
class Meta:
model = UserImages
fields = ['photo']
and this is my view:
def uploadImageView(request):
if request.method == 'POST':
form = UploadImageForm(request.POST, request.FILES)
if form.is_valid():
# file is saved
form.save()
return redirect('/')
else:
form = UploadImageForm()
return render(request, 'uploadImagePage.html', {'uploadImageForm': form})
The URL which calls the uploadImageView view is /uploadImage/. when I go to that URL and upload an image using the uploadImageForm, it gives an error saying:
IntegrityError at /uploadImage/
null value in column "user_id" violates not-null constraint
DETAIL: Failing row contains (1, null, None/uploadedPhotos/imageName.png).
and the traceback leads back to the
form.save()
line in my uploadImageView. What am I doing wrong to cause this error?
Your UserImages model requires user but your form UploadImageForm is asking only asking for photo. You need to set user, try something like this:
def uploadImageView(request):
if request.method == 'POST':
form = UploadImageForm(request.POST, request.FILES)
if form.is_valid():
# file is saved
instance = form.save(commit=False)
instance.user = request.user
instance.save()
return redirect('/')
else:
form = UploadImageForm()
return render(request, 'uploadImagePage.html', {'uploadImageForm': form})
obj = form.save(commit=False)
obj.user = request.user
obj.save()
You must extract user from request.user and add it to form data.

FIle upload with chunks: avoid saving it twice

I use a custom function to upload a file splitting it in chunks, as documented here.
My problem is that calling save() after handle_uploaded_file() uploads my file twice, one into "MEDIA_URL/my_path" dir and one into "MEDIA_URL".
But I would like to have only one upload, the one with chunks.
It is possible to force save() to make 'chunked' upload?
Or should I use different approaches?
Thank you.
models.py
class ShapeFile(models.Model):
name = models.CharField(max_length=100)
srid = models.ForeignKey(SpatialRefSys)
user = models.ForeignKey(User)
color_table = models.ForeignKey(ColorTable)
file = models.FileField(upload_to="my_path")
class Meta:
unique_together = ('name', 'user')
forms.py
class UploadForm(ModelForm):
class Meta:
model = ShapeFile
fields = ('name','user','srid','file','color_table')
widgets = {'srid': TextInput(),
'user': HiddenInput()
views.py
def handle_uploaded_file(fileName, filePath):
with open(filePath, 'wb+') as destination:
for chunk in fileName.chunks():
destination.write(chunk)
#login_required
def shapeIng(request):
if request.method == 'POST':
form = UploadForm(request.POST, request.FILES)
if form.is_valid():
req = request.POST
# Split uploaded file into chunks
fileName = request.FILES['file']
filePath = ShapeFile(file=fileName).file.path
handle_uploaded_file(fileName, filePath)
form.save()
messages.success(request, 'Shapefile upload succesful!')
return redirect('shapeCreated')
else:
messages.error(request, 'Something went wrong uploading Shapefile.')
else: # request.method == 'GET'
form = UploadForm(initial={'user': request.user})
return render_to_response('my_app/base_shapeIngestion.html',
{'form': form},
context_instance=RequestContext(request))
change your view function to this:
def testupload2(request):
if request.method == 'POST':
file_name=request.FILES['file']
form = SomeForm(request.POST, request.FILES)
if form.is_valid():
dest_file = open('C:/prototype/upload/'+ str(file_name), 'wb+')
path = 'C:/prototype/upload/'+ str(file_name)
for chunk in request.FILES['file'].chunks():
dest_file.write(chunk)
dest_file.close()
t = get_template("testupload2.html")
lst = os.listdir('C:/downloads/prototype/prototype/upload/')
html = t.render(Context({'MEDIA_URL':'http://127.0.0.1:8000/site_media/'}))
return HttpResponse(html)

How to upload an image and store its link in database

I read some documents in Django site such as: Basic file uploads and FileField.storage. However, I still don't understand how to upload a file (or an image) to server and store its link in database. I would like to write the files to the following directory such as: 'image/%Y/%m/%d'
Please give me a sample code. Thank you so much.
My code follows as:
#models.py
class Image(models.Model):
imageid = models.AutoField()
title = models.CharField(max_length=100)
imagepath = models.ImageField(upload_to='images/%Y/%m/%d/')
#forms.py
class UploadFileForm(forms.Form):
title = forms.CharField(max_length=100)
image = forms.FileField()
#views.py
def upload_file(request):
if request.method == 'POST':
form = UploadFileForm(request.POST, request.FILES)
if form.is_valid():
# How to upload file to folder named 'images/%Y/%m/%d/'
# How to save the link above to database
return HttpResponseRedirect('/success/url/')
else:
form = UploadFileForm()
return render_to_response('upload.html', {'form': form})
I believe if you create the upload form as a model form and then just save it in the view, it will have the effect of saving the file to the filesystem and the path to the model. This is a basic example, but I think it should work.
# forms.py
class UploadFileForm(forms.ModelForm):
class Meta:
model = models.Image
# views.py
...
form = UploadFileForm(request.POST, request.FILES)
if form.is_valid():
form.save()
return HttpResponseRedirect('/success/url/')

How to override FileField and automatically delete previous file in Django?

im django beginner (django 1.2.5)
I have that model:
class Document(models.Model):
file = models.FileField(upload_to='documents/%Y/%m/%d', null=True, blank=True)
title = models.CharField(max_length=30)
created = models.DateTimeField(auto_now_add=True)
modified = models.DateTimeField(auto_now=True)
author = models.ForeignKey(User)
#other fields
#other fields
and model form to this:
class DocumentForm(ModelForm):
file = forms.FileField(required=True, error_messages={'required' : 'required!','empty': "empty!"})
title = forms.CharField(widget = forms.TextInput(attrs={'size': 93,}), error_messages={'required': 'required!'})
#other fields
#other fields
class Meta:
model = Document
exclude = ('author',)
def save(self, author, commit=True):
document=ModelForm.save(self,commit=False)
document.author = author
if commit:
document.save()
return document
I uploading new documents in using DocumentForm above and it works pretty but when i trying edit some document i cannot put new file in place previous. I may change every field except FileField.
def document_edit(request, document_id):
doc = get_object_or_404(Document, id=document_id)
form = DocumentForm(instance=doc)
if doc.author == request.user:
if request.method == "POST":
form = DocumentForm(request.POST, request.FILES, instance=doc)
if form.is_valid():
if request.POST.get('cancel'):
return HttpResponseRedirect('/')
elif request.POST.get('delete'):
document = Document.objects.get(id=document_id)
document.file.delete()
document.delete()
return HttpResponseRedirect('/')
else:
form.save(author=request.user)
return HttpResponseRedirect('/')
else:
# return again form with errors
else:
# return form with doc instance
else:
# return "you can't edit this doc!"
I research django documentation and i only know i should write some custom save method in some class but i completely have no idea how can i do this. It should be save() method in Document() or in DocumentForm()?
Generally i want this: When i put path to new file in form i want override this new file in his place and automatically delete previous file.
Can you help me? Thanks in advance!
You are on the right track, you just want to use the instance keyword, so your form reflects the object being edited. Simplified version:
def edit_upload(request, document_id):
doc = get_object_or_404(Document, id=document_id)
if request.method == 'POST': # If the form has been submitted...
form = DocumentForm(request.POST, request.FILES, instance=doc)
if form.is_valid(): # All validation rules pass
if doc.file: # If document has file already...
doc.file.delete() # delete it
form.save() # Saves object, uses new uploaded file
return redirect('/thanks/') # Redirect after success
else:
form = DocumentForm(instance=doc) # Show form to edit
return render(request, 'edit.html', {
'form': form,
})