"""

Tests for F() query expression syntax.

"""

from django.db import models

class Employee(models.Model):

    firstname = models.CharField(max_length=50)

    lastname = models.CharField(max_length=50)

    def __unicode__(self):

        return u'%s %s' % (self.firstname, self.lastname)

class Company(models.Model):

    name = models.CharField(max_length=100)

    num_employees = models.PositiveIntegerField()

    num_chairs = models.PositiveIntegerField()

    ceo = models.ForeignKey(

        Employee,

        related_name='company_ceo_set')

    point_of_contact = models.ForeignKey(

        Employee,

        related_name='company_point_of_contact_set',

        null=True)

    def __unicode__(self):

        return self.name