django contenttype
阿新 • • 發佈:2018-12-12
base pan content sca col ner 如何 filter tty
下圖即為django的contenttype表
models.py
1 from django.db import models 2 from django.contrib.contenttypes.models import ContentType 3 from django.contrib.contenttypes.fields import GenericForeignKey,GenericRelation 4 5 6 class PythonBasic(models.Model): 7 course_name = models.CharField(max_length=32)8 coupon = GenericRelation("Coupon") # 反向查詢 通過此字段,類似於 releted_name 9 class Oop(models.Model): 10 course_name = models.CharField(max_length=32) 11 coupon = GenericRelation("Coupon") 12 class Coupon(models.Model): 13 coupon_name = models.CharField(max_length=32) 14 content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE) # 與django contenttype表建立外鍵15 16 object_id = models.PositiveIntegerField() # 對應表中的對象id 17 18 content_object = GenericForeignKey(‘content_type‘,‘object_id‘) # 不會生成列
如何查詢:
def get(self, request): pb = ContentType.objects.filter(app_label="auth",model=‘user‘).first() # 與contenttype表字段對應 pb_model= pb.model_class() # 執行此方法拿到 <class ‘django.db.models.base.ModelBase‘> print(pb_model.objects.all())
如何創建:
object_id = PythonBasic.objects.get(pk=1) Coupon.objects.create(coupon_name="python優惠卷",content_object = object_id)
django contenttype