check if passed context is Empty in Template-CodePudding

what I'm trying to achieve here is if context is empty or if STUDENT variable is empty, instead of returning all students. it should return none and in template it shows No results found. currently when nothing is stored in q my template render all the students.

in views.

def student_home(request):
    q = request.GET.get('q') if request.GET.get('q') != None else ""
    
    students = Student.objects.filter(Q(first_name__icontains=q) | Q(last_name__icontains = q) | Q(grade__icontains=q))
    context = {'students': students}
    return render(request, 'StudentManager/home.html', context)

search-bar in NAVBAR.

<form  role="search" action='{% url 'student_home' %}'>
    <input  type="search" name='q' placeholder="Search Student" aria-label="Search">
    <button type="submit"  style="background: #fff2df;">Search</button>
</form>

CodePudding user response：

You get all students with q = "" because Student.objects.filter(first_name__icontains="") means for django return all Student where first_name is not None.

Try this

def student_home(request):
    q = request.GET.get('q', None)
    if q:
        students = Student.objects.filter(Q(first_name__icontains=q) | Q(last_name__icontains = q) | Q(grade__icontains=q))
    else:
        students = []
    context = {'students': students}
    return render(request, 'StudentManager/home.html', context)

CodePudding user response：

Your questions is confused: in your code, it does not exist a STUDENT variable.

you can just check students variable in your template:

{% if not students %}
No results found
{% endif %}