Django - Join 2 Models in Query

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)

How to write a query to retrieve all the Phone objects where Phone.number = 945678987 and Person.employer = 'xyz' ?

Answer 1

“跨越关系的查找”

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

Answer 2

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