CODEWITHSUNDEEP
pythondjango
user2492364
user2492364

Reputation: 6693

how to check the django objects filter get something

here is my code 

        for add in Address.objects.filter(city_id='112'):
            print add
            if add:
                print 'ok,I got something'
            else:
                print 'nothing found'

When it filter somrthing,it will print :

Address object 
ok.Igot something

But when it didn't filter something,

print add show nothing,and it didn't print 'nothing found'

I want to ask how to check the Address.objects.filter() get object

Upvotes: 0

Views: 44

Answers (2)

user447688
user447688

Reputation:

When Address.objects.filter(city_id='112') returns an empty array, your for loop is skipped entirely. Your if is inside that loop, so when nothing is returned, no other code is hit at all.

Upvotes: 0

catavaran
catavaran

Reputation: 45575

In boolean context queryset returns True if it is not empty and False is nothing is found:

address_list = Address.objects.filter(city_id='112')
if address_list:
    print 'ok,I got something'
    for address in address_list:
        print address
else:
    print 'nothing found'

If you use queryset in the template then the {% for %} ... {% empty %} template tag can help you:

<ul>
    {% for address in address_list %}
        <li>{{ address }}</li>
    {% empty %}
        <li>Nothing found</li>
    {% endfor %}
</ul>

Upvotes: 3

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