Django Query sort case-insensitive using Model method with PostgreSQL

问题

I'm really new to django, python and postgres... I can't seem to find the answer on how to order_by being case insensitive while using Model as the query method, only if you use direct SQL queries.

Model
@classmethod
def get_channel_list(cls, account):
    return cls.objects.filter(accountid=account).order_by('-name').values_list('name', 'channelid')

Data set and order it's currently being ordered in

test
b test
a test channel
a test channel
a test 2 
a b test
Test Channel
Test 3
Test 3
Test 2 Channel

any help would be much appreciated.

回答1:

Using QuerySet.extra(select=...):

@classmethod
def get_channel_list(cls, account):
    ret = cls.objects.extra(select={'name_lower': 'lower(name)'})
    ret = ret.order_by('-name_lower')
    ret = ret.filter(accountid=account).values_list('name', 'channelid')
    return channels

回答2:

With django 1.8, there is a built-in solution:

from django.db.models.functions import Lower
...
ret = ret.order_by(Lower('name_lower'))
ret = ret.order_by(Lower('name_lower').asc())
ret = ret.order_by(Lower('name_lower').desc())

来源：https://stackoverflow.com/questions/20768955/django-query-sort-case-insensitive-using-model-method-with-postgresql