如何在Django模型中一个接一个地显示数据

Question

I am Using Django Framework in my project. I want the results that start with query first then results that contain query next but when I am using the following code it is giving mixed results instead of one after other. How can I achieve My requirement

collections = TokenCollection.objects.filter(Q(title__istartswith=query) | Q(title__icontains=query))

Answer 1

Something using itertools.chain might suit your needs, but you might run into performance problems if the returned dataset is large:

from itertools import chain

collections = list(chain(
    TokenCollection.objects.filter(title__istartswith=query),
    TokenCollection.objects.filter(title__icontains=query)
                           .exclu‌​de(title__istartswit‌​h=query)
))

Answer 2

Try this

from django.db.models import Q, Case, Value, IntegerField


TokenCollection.objects.filter(
    Q(title__istartswith=query) | Q(title__icontains=query)
).annotate(
    c=Case(
        When(title__istartswith=query, then=Value(1)),
        When(title__icontains=query, then=Value(2)),
        output_field=IntegerField())
).order_by('c')