Django
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Feb 22, 2017 · The Django issue tracker has the remarkable entry #5763, titled "Queryset doesn't have a "not equal" filter operator". It is remarkable because (as of April 2016) it was "opened 9 years ago" (in the Django stone age), "closed 4 years ago", and "last changed 5 months ago". Read through the discussion, it is interesting.
Jun 24, 2011 · Django 1.5 supports Python 2.6.5 and later. If you're under Linux and want to check the Python version you're using, run python -V from the command line. If you want to check the Django version, open a Python console and type. Just dive into env before you check the version, otherwise no module named django.
The MultipleObjectsReturned exception is an attribute of the model class. get () raises a DoesNotExist exception if an object wasn't found for the given parameters. This exception is also an attribute of the model class. .filter () Returns a new QuerySet containing objects that match the given lookup parameters.
from django.db.models import Q criterion1 = Q(question__contains="software") criterion2 = Q(question__contains="java") q = Question.objects.filter(criterion1 & criterion2) Note the other answers here are simpler and better adapted for your use case, but if anyone with a similar but slightly more complex problem (such as needing "not" or "or") sees this, it's good to have the reference right here.
You shouldn't use the double-bracket {{ }} syntax within if or ifequal statements, you can simply access the variable there like you would in normal python: {% if title == source %} ... {% endif %} answered Jul 7, 2012 at 4:15. Herman Schaaf. 48.2k 21 105 140.
Jun 10, 2016 · Adding the - will order it in descending order. You can also set this by adding a default ordering to the meta of your model. This will mean that when you do a query you just do MyModel.objects.all() and it will come out in the correct order. class MyModel(models.Model): check_in = models.DateField() class Meta:
May 13, 2016 · In Django, what's the difference between the following two: Article.objects.values_list('comment_id', flat=True).distinct() versus: Article.objects.values('comment_id').distinct() My goal is to get a list of unique comment ids under each Article. I've read the documentation (and in fact have used both approaches). The results overtly seem similar.
Jun 22, 2010 · From django docs. get() raises a DoesNotExist exception if an object is not found for the given parameters. This exception is also an attribute of the model class. The DoesNotExist exception inherits from django.core.exceptions.ObjectDoesNotExist. You can catch the exception and assign None to go.
May 26, 2015 · save () method can be used to insert new record and update existing record and generally used for saving instance of single record (row in mysql) in database. update () is not used to insert records and can be used to update multiple records (rows in mysql) in database. answered May 26, 2015 at 5:31. Roy.
Then, set BASE_DIR / 'templates' to DIRS in TEMPLATES and set BASE_DIR / 'static/' to STATICFILES_DIRS in settings.py as shown below so that Django can recognize templates and static folders just under django-project.
