django - Django 查询：获取按员工人数排序的状态

Question

我想使用 Django ORM 运行以下 SQL 查询。我不想使用原始 sql，因为我想将它与另一个查询连接起来。

SELECT count(e.id), o.state
FROM core_employeemodel e, core_officemodel o
WHERE e.office_id = o.id
GROUP BY o.state 
ORDER BY -count(e.id);

楷模：

class OfficeModel(Model):
    address1 = CharField('address 1', max_length=50,)
    address2 = CharField('address 2', max_length=50, blank=True)
    city = CharField('city', max_length=50, db_index=True)
    state = CharField('state', max_length=2, choices=STATE_CHOICES, db_index=True)
    zip_code = CharField('zip code', max_length=50, db_index=True)
    phone = CharField('phone', max_length=50,)
    fax = CharField('fax', max_length=50, blank=True)

class EmployeeModel(Model):
    first_name = CharField('first name', max_length=50, db_index=True)
    last_name = CharField('last name', max_length=50, db_index=True)
    picture = ImageField('picture', upload_to='employee_picture/', blank=True,)
    fax = CharField('fax', max_length=50, blank=True)
    email = EmailField('email', unique=True)

我尝试使用注释，但没有得到好的结果。你们能帮帮我吗？

Answer 1

解决了它：

OfficeModel.objects.values('state').annotate(employee_cnt=Count('employee_office')).order_by('-employee_cnt')

希望它可以帮助别人！