我想在我的查询集中添加一些额外的字段。

models.py

class Company(models.Model):
    ENTITY_CHOICES  = ( ('CO', 'Corporation'),('PR','Proprietor'),('PA','Partnership'),('NO','Nonprofit'))
    legal_name      = models.CharField(max_length=120, blank=True)
    entity          = models.CharField(max_length=1, null=True, choices=ENTITY_CHOICES, default='CO')
    client          = models.ForeignKey(Clients, models.SET_NULL, blank=True, null=True) 

views.py

qs = Company.objects.filter(entity=PA)