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[英]Python Django populate field in a model using another field in the same model
[英]Django Model field to populate another field
我又回來了,我已經在這個問題上超過 48 小時了,仍然找不到對此的回應。
我有這個模型。
職位表有現場工程師、現場經理、暖通空調工程師等
工程師每個只有一個職位,我希望只有在創建的工程師具有站點經理職位時才填充經理字段。 如果創建了工程師,則經理字段將是具有站點經理職位的工程師的下拉列表。
from django.db import models
class Position(models.Model):
name = models.CharField(max_length=100, default='Site Engineer')
def __str__(self):
return self.name
class Engineers(models.Model):
region = (
('SS', 'South-South'), ('SW', 'South-West'), ('SE', 'South-East'),
('NE', 'North-East'), ('NW', 'North-West'), ('NC', 'North-Central'),
)
firstname = models.CharField(max_length=20)
lastname = models.CharField(max_length=20)
email = models.EmailField(max_length=50)
username = models.CharField(max_length=20, default='Leave Blank', unique=True)
phone = models.CharField(max_length=11)
position = models.ForeignKey(Position, on_delete=models.DO_NOTHING)
workarea = models.CharField(max_length=20, choices=region)
manager = models.CharField(verbose_name='Site Manager', max_length=80, default=None)
def save(self, *args, **kwargs):
self.username = self.firstname +'.'+self.lastname
self.manager = self.firstname +' '+self.lastname
super(Engineers, self).save(*args, **kwargs)
def __str__(self):
return self.firstname + ' ' + self.lastname
此代碼僅使用工程師的姓名填充經理字段,即使他們不是站點經理。
請幫忙
我能夠通過將 manager 字段編輯為以下內容來解決此問題:
manager = models.ForeignKey('self' , on_delete=models.PROTECT, blank=True, db_index=False, related_name='Manager')
如此處所示https://docs.djangoproject.com/en/3.2/ref/models/fields/#module-django.db.models.fields.related 。
不過,請務必將 db_index 設置為 false。
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