Save file from ModelForm's FileField

Question

I'm trying to upload file using the file input in the model creation page in the Django's admin panel. The file isn't a part of an object, so it doesn't belong to an object itself. I just need to get it, process it and then delete it.

I've created a form:

class AddTaskAndTestsForm(forms.ModelForm):
    tests_zip_field = forms.FileField(required=False)

    def save(self, commit=True):
        # I need to save and process the tests_zip_field file here
        return super(AddTaskAndTestsForm, self).save(commit=commit)

    class Meta:
        model = Problem

And I added the form to the admin panel, so it's now displayed there.

I need to save the file, once the create form is submitted, but how do I do that?

UPDATE: here's how I use it.

admin.py:

class ProblemAdmin(admin.ModelAdmin):
    form = AddTaskAndTestsForm

    fieldsets = [
        # ... some fieldsets here
        ('ZIP with tests', {
            'fields': ['tests_zip_field']
        })
    ]

    # ... some inlines here

Answer 1

Try this:

class AddTaskAndTestsForm(forms.ModelForm):
    tests_zip_field = forms.FileField(required=False)

    def save(self, commit=True):
        instance = super(AddTaskAndTestsForm, self).save(commit=False)
        f = self['tests_zip_field'].value() # actual file object
        # process the file in a way you need
        if commit:
            instance.save()
        return instance

Answer 2

You can call tests_zip_field.open() ( behaves pretty much like the python open() ) and use it in your save() method like this :

tests_zip_file = self.tests_zip_field.open()
tests_zip_data = tests_zip_file.read()
## process tests_zip_data 
tests_zip_file.close()

the file is saved in your MEDIA_ROOT/{{upload_to}} folder whenever the save() method finishes