django order_by query set, ascending and descending
PythonDjangoSortingPython Problem Overview
How can I order by descending my query set in django by date?
Reserved.objects.all().filter(client=client_id).order_by('check_in')
I just want to filter from descending all the Reserved by check_in date.
Python Solutions
Solution 1 - Python
Reserved.objects.filter(client=client_id).order_by('-check_in')
Notice the - before check_in.
[Django Documentation][1]
[1]: https://docs.djangoproject.com/en/dev/ref/models/querysets/#order-by "Documentation"
Solution 2 - Python
Reserved.objects.filter(client=client_id).order_by('-check_in')
A hyphen "-" in front of "check_in" indicates descending order. Ascending order is implied.
We don't have to add an all() before filter(). That would still work, but you only need to add all() when you want all objects from the root QuerySet.
More on this here: https://docs.djangoproject.com/en/dev/topics/db/queries/#retrieving-specific-objects-with-filters
Solution 3 - Python
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:
ordering = ('-check_in',)
Solution 4 - Python
You can also use the following instruction:
Reserved.objects.filter(client=client_id).order_by('check_in').reverse()
Solution 5 - Python
for ascending order:
Reserved.objects.filter(client=client_id).order_by('check_in')
for descending order:
1. Reserved.objects.filter(client=client_id).order_by('-check_in')
or
2. Reserved.objects.filter(client=client_id).order_by('check_in')[::-1]
Solution 6 - Python
It works removing .all():
Reserved.objects.filter(client=client_id).order_by('-check_in')
Solution 7 - Python
-
Ascending order
Reserved.objects.all().filter(client=client_id).order_by('check_in') -
Descending order
Reserved.objects.all().filter(client=client_id).order_by('-check_in')
- (hyphen) is used to indicate descending order here.
Solution 8 - Python
67
Reserved.objects.filter(client=client_id).order_by('-check_in')
'-' is indicates Descending order and for Ascending order just give class attribute
Solution 9 - Python
Reserved.objects.filter(client=client_id).earliest('check_in')
Or alternatively
Reserved.objects.filter(client=client_id).latest('-check_in')
Here is the documentations for earliest() and latest()
Solution 10 - Python
If for some reason you have null values you can use the F function like this:
from django.db.models import F
Reserved.objects.all().filter(client=client_id).order_by(F('check_in').desc(nulls_last=True))
So it will put last the null values. Documentation by Django: https://docs.djangoproject.com/en/stable/ref/models/expressions/#using-f-to-sort-null-values
Solution 11 - Python
This is working for me.
latestsetuplist = SetupTemplate.objects.order_by('-creationTime')[:10][::1]
Solution 12 - Python
This is very easy and simple just follow the below instruction.
----- This for Descending
Reserved.objects.filter(client=client_id).order_by('-check_in')
------This for Ascending
Reserved.objects.filter(client=client_id).order_by('check_in')
if you want to select by Descending just add minus operator before the attribute field or if you want to select by Ascending no need minus operator.
Solution 13 - Python
You can try this
Staffs.objects.filter(active=1).order_by('rank')
- (hyphen) is used to indicate descending orde.