from django.shortcuts import render, HttpResponsefrom app01 import modelsfrom django.contrib.contenttypes.models import ContentTypedeftest(request): if request.method == 'GET':
# ContentType表对象有model_class() 方法，取到对应model content = ContentType.objects.filter(app_label='app01', model='electrics').first() # 表名小写 cloth_class = content.model_class() # cloth_class 就相当于models.Electrics res = cloth_class.objects.all()
print(res)
# 为三星电视(id=2)创建一条优惠记录 s_tv = models.Electrics.objects.filter(id=2).first()
models.Coupon.objects.create(name='电视优惠券', content_object=s_tv)
# 查询优惠券（id=1）绑定了哪些商品 coupon_obj = models.Coupon.objects.filter(id=1).first()
prod = coupon_obj.content_object
print(prod)
# 查询三星电视(id=2)的所有优惠券 res = s_tv.coupons.all()
print(res)
# 查询obj的所有优惠券：如果没有定义反向查询字段，通过如下方式： content = ContentType.objects.filter(app_label='app01', model='model_name').first()
res = models.OftenAskedQuestion.objects.filter(content_type=content, object_id=obj.pk).all()
return HttpResponse('....')
from django.db import modelsfrom django.contrib.contenttypes.models import ContentTypefrom django.contrib.contenttypes.fields import GenericForeignKeyclassElectrics(models.Model): name = models.CharField(max_length=32)
coupons = GenericRelation(to='Coupon') # 用于反向查询，不会生成表字段 def__str__(self): return self.nameclassFoods(models.Model): name = models.CharField(max_length=32)
coupons = GenericRelation(to='Coupon')
def__str__(self): return self.nameclassClothes(models.Model): name = models.CharField(max_length=32)
coupons = GenericRelation(to='Coupon')
def__str__(self): return self.nameclassCoupon(models.Model): name = models.CharField(max_length=32)
content_type = models.ForeignKey(to=ContentType) # step 1 object_id = models.PositiveIntegerField() # step 2 content_object = GenericForeignKey('content_type', 'object_id') # step 3 def__str__(self): return self.name
