'how should django query be in my function?

I have a model with file field i am trying to download the data after querying from database how should my query be.

models.py:

class Mymodel(Basemodel):
        file_processed = models.FileField(
        upload_to='myfile/ss',
        validators=[FileExtensionValidator([''])],
        blank=True,
        null=True,
        editable=False,

views.py :

@api_view(('GET',))
def download_view(request):
    d = ''' Mymodel.objects.?'''
    response = HttpResponse(
        d.file,
        content_type='',
    )
    return response


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