篩選人

Question

我有這樣的模式：

class People(models.Model): 
    """ 
    People model 
    """ 
    name = models.CharField(max_length=120) 
    birth_date = models.DateField() 

，我想所有的人篩選與給定的參數，例如年齡：

min_age = 24 
# Filter people older than ´min_age´ 
people = People.objects.filter(birth_date__lte = (#something here to filter with age)) 

我該怎麼辦那？

Answer 1

你必須覈對一個datetime.date這是允許的最大出生日期：任何人，一天後出生將超過最小年齡年輕：

from datetime import date 

min_age = 24 
max_date = date.today() 
try: 
    max_date = max_date.replace(year=max_date.year - min_age) 
except ValueError: # 29th of february and not a leap year 
    assert max_date.month == 2 and max_date.day == 29 
    max_date = max_date.replace(year=max_date.year - min_age, month=2, day=28) 
people = People.objects.filter(birth_date__lte=max_date)