筛选人

Question

我有这样的模式：

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

，我想所有的人筛选与给定的参数，例如年龄：

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

我该怎么办那？

Answer 1

你必须核对一个datetime.date这是允许的最大出生日期：任何人，一天后出生将超过最小年龄年轻：

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)