Django validation of number from query string - django

Question

Im having this code to create and add students to database.
I need to make validation of count which must be integer, only positive, equal or less 100.
Please help.
def generate_students(request):
count = request.GET.get('count')
studentslist = []
for student in range(0, int(count)):
student = Student.objects.create(first_name = fake.first_name(), last_name = fake.last_name(), age = random.randint(18,100))
studentslist.append(student)
output = ', '.join(
[f"id = {student.id} {student.first_name} {student.last_name}, age = {student.age};" for student in studentslist]
)
return HttpResponse(str(output))

Answer 1

The best way is likely to work with a form, since a form has a lot of validation inplace, can clean the object, and print sensical errors.
We thus can work with a simple form:
from django import forms
class CountForm(forms.Form):
count = forms.IntegerField(min_value=1, max_value=100)
then we can validate the input with:
def generate_students(request):
form = CountForm(request.GET)
if form.is_valid():
count = form.cleaned_data['count']
studentslist = [
Student.objects.create(first_name = fake.first_name(), last_name = fake.last_name(), age = random.randint(18,100))
for _ in range(count)
]
output = ', '.join(
[f'id = {student.id} {student.first_name} {student.last_name}, age = {student.age};'
for student in studentslist]
)
else:
return HttpResponse(str(form.errors))
return HttpResponse(str(output))
Note: Section 9 of the HTTP protocol
specifies that requests like GET and HEAD should not have side-effects, so you
should not change entities with such requests. Normally POST, PUT, PATCH, and
DELETE requests are used for this. In that case you make a small <form> that
will trigger a POST request, or you use some AJAX calls.