django icontains with __in lookup
This is the approach that I adopted:
class MyManager(models.Manager):
def exclusive_in(self, lookup, value_list):
return self.filter(reduce(or_, (Q(**{lookup:_}) for _ in value_list)))
Here is now to use it:
Companies.objects.exclusive_in('name__icontains', possible_merchants])
It was inspired by other answers in this thread, as well as Django filter queryset __in for *every* item in list.
You can create querysets with the Q
constructor and combine them with the |
operator to get their union:
from django.db.models import Q
def companies_matching(merchants):
"""
Return a queryset for companies whose names contain case-insensitive
matches for any of the `merchants`.
"""
q = Q()
for merchant in merchants:
q |= Q(name__icontains = merchant)
return Companies.objects.filter(q)
(And similarly with iexact
instead of icontains
.)
I find it a cleaner approach using reduce
and or_
operator:
from django.db.models import Q
from functools import reduce
from operator import or_
def get_companies_from_merchants(merchant_list):
q_object = reduce(or_, (Q(name__icontains=merchant) for merchant in merchant_list))
return Companies.objects.filter(q_object)
This would create a list of Q
objects querying the name
to contain a single element in merchant list. This would happpen for all the elements in merchant_list
and all these Q
objects would be reduced to a single Q
object having mutliple ORs which can be directly applied to the filter query.