Django查詢：獲取按員工數量排序的狀態

Question

我想使用Django ORM運行以下SQL查詢。我不想使用原始的sql，因爲我想將它與另一個查詢連接起來。

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); 

型號：

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) 

我試圖說明，但我沒有得到一個好的結果。你們能幫我嗎？

Answer 1

解決它：

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

希望它可以幫助別人！