[英]How to set Django model default value equal to result of a query
我是 Django 的新手,並嘗試創建一個 model,其中外鍵用戶和部門的默認值設置為登錄用戶的正確值。 通常我使用請求 object 並查詢數據庫,但在 model 定義中我不知道該怎么做。 我想前進的道路是將默認值設為 function 並在 function 中進行查詢,但我被卡住了。 非常感謝任何幫助。 這是我的代碼示例:
from django.contrib.auth import get_user_model
from django.db import models
from another_app.models import Department, DepartmentPermissions
class Article(models.Model):
header = models.CharField(max_length=200)
text = models.CharField(max_length=800)
owner = models(get_user_model(), related_name='owner_article', on_delete=models.PROTECT)
department = models.ForeignKey(Department, on_delete=models.CASCADE) #here I want it defaulted to DepartmentPermissions.objets.get(user= <logged in user>)[0].department
嗯,這是可能的,但不是來自 model,而是來自管理員。 所以,你可以這樣做:
from django.contrib.auth import get_user_model
from django.db import models
from another_app.models import Department, DepartmentPermissions
# import admin
from django.contrib import admin
class Article(models.Model):
header = models.CharField(max_length=200)
text = models.CharField(max_length=800)
owner = models(get_user_model(), related_name='owner_article', on_delete=models.PROTECT)
department = models.ForeignKey(Department, on_delete=models.CASCADE)
class ArticleAdmin(admin.ModelAdmin):
def save_model(self, request, obj, form, change):
obj.department = request.user
obj.save()
現在,它將像默認值一樣,因為當您保存到 model 時,該值將從save_model保存
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