如何在 django views.py 中的单个变量或列表中存储多个值？

Question

Here is my views.py

@login_required
def appsc(request):

    allapplied = Applied_Scholarships.objects.filter(user_id = request.user.id)
    for applied in allapplied.iterator():
        print('hi')
        sch_id = applied.scholarship_id
        queryset = ScholarshipDetails.objects.filter(id = sch_id)
        print(queryset)
        context = {"object_list":queryset}

    return render(request,'applied-scholarships.html',context)

Here, I need to check the applied scholarships of a student. So for that, I have filtered the entries from the Applied_Scholarship table. Now from that, I took scholarship_id and filtered the entries in ScholarshipDetails table so that I get the name and other details of the scholarship.

Now how do I prevent object_list to get overridden? This code gives me value of only 1 scholarship instead of 2.

Here is my template:

            <table class="table mb-0">
                <tr>
                    <th>Scholarship name</th>
                    <th>End Date</th>
                    <th>Status</th>
                    <th></th>
                    <th></th>
                </tr>
                {% for instance in object_list %}
                    <tr>
                        <td>{{instance.name}}</td>
                        <td>{{instance.end_date}}</td>
                        <td>{{applied.status}}</td>
                        <td><a href = "government/home">{{schdets.link}}</a></td>
                    </tr>
                {% endfor %}
            </table>

Do I need to use list? If yes, then how?

Answer 1

For not overwriting a variable inside a for-loop you do following:

list_ = []
for x in items:
    list_.append(x.something)
context = {'object_list': list_}

But instead of looping over allaplied and getting the id for ScholarshipDetails you could get all at once, like:

sch_ids = [x.scholarschip_id for x in allapplied.iterator()]
queryset = ScholarshipDetails.objects.filter(id__in=sch_ids)

You need less database queries and you don't overwrite your variable.

Furthermore: I guess your models have a OneToOne -relation, so you could use select_related to directly get your details while fetching the Applied_Scholarships -instances. Then you could get rid of the second filter and just use the related field for the details models, eg applied.details (exact name depends on your model-design).