Django Query __isnull = True或= None

Question

這是一個簡單的問題。我想知道這是否是相同的寫：

queryset = Model.objects.filter(field=None) 

比：

queryset = Model.objects.filter(field__isnull=True) 

我使用Django 1.8

Answer 1

他們是平等的：

>>> str(Person.objects.filter(age__isnull=True).query) == str(Person.objects.filter(age=None).query) 
True 
>>> print(Person.objects.filter(age=None).query) 
SELECT "person_person"."id", "person_person"."name", "person_person"."yes", "person_person"."age" FROM "person_person" WHERE "person_person"."age" IS NULL 
>>> print(Person.objects.filter(age__isnull=True).query) 
SELECT "person_person"."id", "person_person"."name", "person_person"."yes", "person_person"."age" FROM "person_person" WHERE "person_person"."age" IS NULL