saving image/doc or media files dynamicallly created folder from input form in django - django

Question

I want to make a Notes Platform where teachers can upload Notes and others can access it . The problem is whenever I am uploading the image it is going to the same folder and I am not able to categorise it according to year,branch,subject, and unit-wise.
Since all the media files are uploaded to the same folder I am unable to get the logic how will i able to fetch the media/image/doc file when a user query for the notes.
my model form is :-
class Note(models.Model):
year_choices = (
( 1 , 'First' ),
( 2 , 'Second'),
( 3 , 'Third' ),
( 4 , 'Fourth')
)
branch_choices = (
( 'IT','IT' ),
( 'EE','EE' ),
( 'CSE','CSE'),
( 'EC','EC' ),
( 'ME','ME' ),
( 'CE','CE' ),
)
unit_choices = ((1,'1'),(2,'2'),(3,'3'),(4,'4'),(5,'5'),
(6,'6'),(7,'7'),(8,'8'),(9,'9'),(10,'10'))
branch = models.CharField(max_length=55,choices=branch_choices)
year = models.IntegerField(choices = year_choices)
subject_name = models.CharField(max_length = 15)
unit = models.IntegerField(choices=unit_choices)
location = 'images'
picture = models.ImageField(upload_to = location)
My notes uploading form and searchform(for searching) is field is :-
class notesform(forms.ModelForm):
class Meta:
model = Note
fields = [ 'year','branch','subject_name','unit','picture' ]
class searchform(forms.ModelForm):
class Meta:
model = Note
fields = [ 'year','branch','subject_name','unit' ]
My notes adding function logic is :-
def addNotes(request):
if request.user.is_authenticated():
if request.method == "POST":
form = notesform(request.POST,request.FILES)
if form.is_valid():
profile = Note()
profile.year = form.cleaned_data["year"]
profile.branch = form.cleaned_data["branch"]
profile.subject_name = form.cleaned_data["subject_name"]
profile.picture = form.cleaned_data["picture"]
post = form.save(commit=False)
post.save()
return redirect('Notes', pk=post.pk)
else:
form = notesform()
return render(request, 'newNotes.html', {'form': form})
else:
return redirect('/accounts/login/')
I want to make upload in such a way that when the teacher fill the form and send upload the media the files upload according to the fields data he will be filling in. For ex:- Teacher fill the form as "First year" then "CSE branch" then "Data Structure" ad "Unit 1" , then it goes to the dynamic media folder "media/images/1/CSE/DATA_STRUCTURE/UNIT_1/".So that i can easily implement the search query .
If it can not applied in this way please suggest some other ways.

Answer 1

The problem is whenever I am uploading the image it is going to the same folder and I am not able to categorise it according to year,branch,subject, and unit-wise.
Instead of creating a new directory for very unit (which is ultimately going to result in a huge directory tree), you can provide a well structured name to uploaded picture and save it in the images directory itself.
Define a function to generate new name for picture:
def generate_picture_name(instance, filename):
url = "images/{0}_{1}_{2}_{3}.jpg".format(
instance.branch, instance.year, instance.subject_name, instance.unit)
return url
And update picture field to use generate_picture_name for saving image file.
picture = models.ImageField(upload_to = generate_picture_name)
Now the image file will be saved as:
media/images/CSE_1_DATA_STRUCTURE_UNIT_1.jpg