How to access a part of URL address (not full URL) in Django template

Question

How do I get '12' which is the id of teacher model in this path from Django template?

http://localhost:8000/editTeacher/12/

I searched a bit and I know how to get the entire url, but don't know how do I get a part of it.

I also tried using request.get('id') but it didn't work!

My urls.py:

urlpatterns = [
    path('admin/', admin.site.urls),
    path('addTeacher/', addTeacherView, name='add-teacher'),
    path('listTeacher/', listTeacherView, name='list-teacher'),
    path('teacherIndex/<int:my_id>/', teacherIndexView, name='teacher-index'),
    path('deleteTeacher/<int:my_id>/',
         deleteTeacherView, name='delete-teacher-view'),
    path('editTeacher/<int:my_id>/', editTeacherView, name='edit-teacher'),
    path('', homeView, name='home')
]

My views.py:

def editTeacherView(request, my_id):
    my_instance = Teacher.objects.get(id=my_id)
    teacher = TeacherForm(request.POST or None, instance=my_instance)
    if teacher.is_valid():
        teacher.save()
        return redirect('../../listTeacher/')
    context = {
        'editTeacher': teacher
    }
    return render(request, 'teacher/editTeacher.html/', context)

And this one below is the view I will be using in order to grab the id of the teacher from url and delete it from database

def deleteTeacherView(request, my_id):
    try:
        teacher = Teacher.objects.get(id=my_id)
        if request.method == 'POST':
            teacher.delete()
            return redirect('../../listTeacher/')
    except Teacher.DoesNotExist:
        raise Http404
    context = {
        'teacherId': teacher
    }
    return render(request, 'teacher/deleteTeacher.html', context)

this is editTeacher.html page:

<form method='POST'>
    {% csrf_token %}
    {{ editTeacher.as_p }}
    <input type="submit" value="Save">
    <a href="../../deleteTeacher/{{ #grab_id }}/">Delete</a>

</form>

That comes with correctly defining your paths. Show us your urls.py and your view. — dirkgroten
– dirkgroten, Commented Mar 22, 2019 at 15:23
A couple of tips: your code would be clearer if you use teacher = Teacher.objects.get(id=my_id) in both views, then use form = TeacherForm(request.POST or None, instance=teacher) in the edit view. For function based views in Django, the usual names would be edit_teacher_view and delete_teacher_view. — Alasdair
– Alasdair, Commented Mar 22, 2019 at 15:33

Alasdair · Accepted Answer · 2019-03-22 15:59:54Z

2

This kind of logic belongs in the view, not the template. You can pass the my_id to the template context in your view, for example:

def editTeacherView(request, my_id):
    context = {
        ...
        my_id: my_id,
    }
    return render(request, "edit_teacher.html", context}

Then in your template you can do {{ my_id }}

<a href="../../deleteTeacher/{{ my_id }}/">Delete</a>

Note that it's a bad idea to hardcode URLs like this. You can use the {% url %} tag instead:

<a href="{% url 'delete-teacher-view' my_id %}>

If you use a namespace (e.g. app_name = 'teachers'`), then you'll need to include this in the tag:

<a href="{% url 'teachers:delete-teacher-view' my_id %}>

Similarly, in your views you can use the URL name when you redirect instead of hardcoding the URL:

return redirect('list-teacher')

edited Mar 22, 2019 at 15:59

answered Mar 22, 2019 at 15:25

Alasdair

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3 Comments

Mir Stephen Over a year ago

I thank you for taking time and answering it. I read your comment and answer both. I am kind of confused how to do that. I tried it and get an error, probably because I couldn't get the explanation well, my fault. if you don't mind can you please edit my codes so I understand how is your approach. I want to grab the id and delete that teacher!

Alasdair Over a year ago

You have {{ #grab_id }} in your latest update -- I've showed you that you should use {{ my_id }} once you've added my_id to the context dictionary in editTeacherView. If you still can't get it working, please update your question with the updated view and template, and any error message you get.

Mir Stephen Over a year ago

Thank you so much bro, God bless you

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