Django的 - 加入2種型號在查詢

Question

class Person(models.Model): 
    name = models.CharField(max_length=20) 
    employer = models.CharField(max_length=20) 

class Phone(models.Model): 
    person = models.ForeignKey(Person) 
    number = models.CharField(max_length=10) 
    vendor = models.CharField(max_length=20) 

如何編寫一個查詢檢索所有電話的對象，其中Phone.number = 945678987和Person.employer = 'xyz'？

Answer 1

"Lookups that span relationships"

Phone.objects.filter(number=u'945678987', person__employer=u'xyz') 

Answer 2

Phone.objects.filter(number='945678987', person__employer='xyz')