django模型一对一关系

django模型一对一关系

模型：创建顾客信息表customer和顾客详细信息表customerinfo

from django.db import models

# Create your models here.
#一对一关系
# 顾客表
class Customer(models.Model):
    name=models.CharField(max_length=10)

    class Meta():
        db_table = 'customer'

# 顾客详细信息表
class CustomerInfo(models.Model): 
    # 在顾客详细信息表中关联用户表,让两个表的数据产生联系
    cid = models.OneToOneField(Customer, on_delete=models.CASCADE)
        # 第一个参数：是被关联的模型名称
        # 第二个参数：当被关联的顾客customer表中的一条数据被删除的时候,与之关联的顾客详细信息customerinfo表中的数据也会被删除
    address = models.CharField(max_length=50)

    class Meta():
        db_table = 'customerinfo'

根路由

from django.contrib import admin
from django.urls import path, include

urlpatterns = [
    path('admin/', admin.site.urls),
    path('app/', include('myapp.urls')),
]

子路由

from django.urls import path, re_path
from . import views

urlpatterns = [
    path('oto_add_01/', views.onetoone_add_01),
    path('oto_add_02/', views.onetoone_add_02),
    path('oto_search/', views.onetoone_search),
    path('oto_update/', views.onetoone_update),
    path('oto_delete/', views.onetoone_delete),
]

视图函数

from django.shortcuts import render
from django.http import HttpResponse, Http404
from django.urls import reverse
from . import models

# 增
def onetoone_add_01(request):
    # 1.在添加顾客信息时添加顾客详细信息
    add_customer = models.Customer()
    add_customer.name = 'jack'
    add_customer.save()
    # 添加顾客详情表数据
    add_customerinfo = models.CustomerInfo()
    add_customerinfo.address = 'shanghai'
    # 关联顾客表,关联的是顾客表对象
    add_customerinfo.cid = add_customer
    add_customerinfo.save()

    return HttpResponse('<script>alert("success");</script>')

def onetoone_add_02(rquest):
    # 2.在已有顾客信息后添加顾客详细信息
    # 获取需要添加详细信息的顾客
    customer = models.Customer.objects.all().get(name='pony')
    print(customer)
    add_customerinfo = models.CustomerInfo()
    add_customerinfo.address = 'chengdu'
    # 关联的是顾客表对象
    add_customerinfo.cid = customer
    add_customerinfo.save()

    return HttpResponse('<script>alert("success");</script>')

# 查
def onetoone_search(request):
    # 1.通过顾客表customer查找顾客详细信息表数据
    customerobj = models.Customer.objects.filter(name='pony').first()
    print(customerobj.name)
    # 根据顾客表customer查找顾客详细信息表customerinfo数据: 顾客对象.顾客详细信息类名(小写).顾客详细信息属性
    print(customerobj.customerinfo.address)

    # 2.通过顾客详细信息表customerinfo查找顾客表数据
    customerinfoobj = models.CustomerInfo.objects.first()
    print(customerinfoobj.address)
    # 根据顾客详细信息表customerinfo查找顾客表customer数据: 顾客详细信息对象.外键.顾客信息属性
    print(customerinfoobj.cid.name)

    return HttpResponse('<script>alert("success");</script>')

# 改
def onetoone_update(request):
    customerobj = models.Customer.objects.filter(name='pony').first()
    customerobj.name = 'zhuge'
    customerobj.customerinfo.address = 'xixia'
    customerobj.save()

    customerinfoobj = models.CustomerInfo.objects.filter(address='beijing').first()
    customerinfoobj.address = 'lechang'
    customerinfoobj.cid.name = 'kunge'
    customerinfoobj.save()

    return HttpResponse('<script>alert("success");</script>')

# 删
def onetoone_delete(request):
    # 1.删除顾客信息表customer数据,与子关联的顾客详细信息表customerinfo的数据也会删除
    customerobj = models.Customer.objects.filter(id=4).first()
    customerobj.delete()

    # 2.删除顾客详细信息表customerinfo数据,与子关联的顾客信息表customer的数据不会产生影响
    customerinfoobj = models.CustomerInfo.objects.filter(id=9).first()
    customerinfoobj.delete()

    return HttpResponse('<script>alert("success");</script>')