8-3 用户收藏接口实现

用户收藏 是属于用户操作行为

所以要写到 user_operation

C:\Users\huang\PycharmProjects\MxShop\apps\user_operation\serializers.py

from rest_framework import serializers
from .models import UserFav


class UserFavSerializer(serializers.ModelSerializer):
    class Meta:
        model = UserFav
        fields = ("user", "goods")

 

C:\Users\huang\PycharmProjects\MxShop\apps\user_operation\views.py

from rest_framework import viewsets
from rest_framework import mixins


from .models import UserFav
from .serializers import UserFavSerializer


class UserFavViewset(mixins.CreateModelMixin, mixins.DestroyModelMixin, viewsets.GenericViewSet):
    """
    用户收藏功能
    """
    queryset = UserFav.objects.all()
    serializer_class = UserFavSerializer

 

 

第三步：

 

"""MxShop URL Configuration

The `urlpatterns` list routes URLs to views. For more information please see:
    https://docs.djangoproject.com/en/2.2/topics/http/urls/
Examples:
Function views
    1. Add an import:  from my_app import views
    2. Add a URL to urlpatterns:  path('', views.home, name='home')
Class-based views
    1. Add an import:  from other_app.views import Home
    2. Add a URL to urlpatterns:  path('', Home.as_view(), name='home')
Including another URLconf
    1. Import the include() function: from django.urls import include, path
    2. Add a URL to urlpatterns:  path('blog/', include('blog.urls'))
"""
# from django.contrib import admin
# from django.urls import path
from django.conf.urls import url, include
import xadmin
from MxShop.settings import MEDIA_ROOT
from django.views.static import serve
from rest_framework.documentation import include_docs_urls
from rest_framework.routers import DefaultRouter
from rest_framework.authtoken import views
from rest_framework_jwt.views import obtain_jwt_token

from goods.views import GoodsListViewSet, CategoryViewSet
from users.views import SmsCodeViewset, UserViewset
from user_operation.views import UserFavViewset

router = DefaultRouter()

# 配置 goods 的url
router.register(r'goods', GoodsListViewSet)

# 配置 category 的url
router.register(r'categorys', CategoryViewSet)

# 配置
router.register(r'code', SmsCodeViewset, base_name="code")

router.register(r'users', UserViewset, base_name="users")

router.register(r'userfavs', UserFavViewset, base_name="userfavs")


urlpatterns = [
    # path('admin/', admin.site.urls),
    url(r'^xadmin/', xadmin.site.urls),
    url(r'^api-auth/', include('rest_framework.urls', namespace='rest_framework')),
    url(r'^media/(?P.*)$', serve, {"document_root": MEDIA_ROOT}),

    # 商品列表页
    # url(r'goods/$', goods_list, name="goods-list"),
    url(r'^', include(router.urls)),

    url(r'docs/', include_docs_urls(title="木星")),

    # drf自带的token认证模式
    url(r'^api-token-auth/', views.obtain_auth_token),

    # jwt的认证接口
    # url(r'^jwt_auth/', obtain_jwt_token),
    url(r'^login/', obtain_jwt_token),
]

效果：

 

现在的逻辑是 用户可以选择，是不对的。

默认的应该是登录用户

https://www.django-rest-framework.org/api-guide/validators/#currentuserdefault

 

owner = serializers.HiddenField(
    default=serializers.CurrentUserDefault()
)

效果：

现在只显示商品 

 

选择一个商品，然后 POST 一下

报错：

ValueError at /userfavs/

Cannot assign "": "UserFav.user" must be a "UserProfile" instance.

Request Method: 	POST
Request URL: 	http://localhost:8000/userfavs/
Django Version: 	1.11
Exception Type: 	ValueError
Exception Value: 	

Cannot assign "": "UserFav.user" must be a "UserProfile" instance.

Exception Location: 	D:\Envs\MxShop\lib\site-packages\django\db\models\fields\related_descriptors.py in __set__, line 216
Python Executable: 	D:\Envs\MxShop\Scripts\python.exe
Python Version: 	3.6.0
Python Path: 	

['C:\\Users\\huang\\PycharmProjects\\MxShop\\extra_apps',
 'C:\\Users\\huang\\PycharmProjects\\MxShop\\apps',
 'C:\\Users\\huang\\PycharmProjects\\MxShop',
 'C:\\Users\\huang\\PycharmProjects\\MxShop',
 'C:\\Program Files\\JetBrains\\PyCharm 2018.2.4\\helpers\\pydev',
 'C:\\Users\\huang\\PycharmProjects\\MxShop',
 'C:\\Users\\huang\\PycharmProjects\\MxShop\\apps',
 'C:\\Users\\huang\\PycharmProjects\\MxShop\\extra_apps',
 'C:\\Program Files\\JetBrains\\PyCharm 2018.2.4\\helpers\\pydev',
 'C:\\Users\\huang\\.PyCharm2018.2\\system\\cythonExtensions',
 'D:\\Envs\\MxShop\\Scripts\\python36.zip',
 'C:\\Users\\huang\\AppData\\Local\\Programs\\Python\\Python36\\DLLs',
 'C:\\Users\\huang\\AppData\\Local\\Programs\\Python\\Python36\\lib',
 'C:\\Users\\huang\\AppData\\Local\\Programs\\Python\\Python36',
 'D:\\Envs\\MxShop',
 'D:\\Envs\\MxShop\\lib\\site-packages',
 'D:\\Envs\\MxShop\\lib\\site-packages\\setuptools-39.1.0-py3.6.egg',
 'C:\\Program Files\\JetBrains\\PyCharm '
 '2018.2.4\\helpers\\pycharm_matplotlib_backend']

Server time: 	星期日, 5 五月 2019 14:58:32 +0800

 

 

 

这个问题没有解决

 

接着往下看

加上：

mixins.ListModelMixin

 

刷新页面：

 

点击发送：

就删除了 id为1 的收藏

 

现在的同一个商品可以收藏多次，需要改进

 

        unique_together = ("user", "goods")

 

先把收藏表清空，然后同步表，

makemigrations

migrate

 

现在同一个商品再次收藏 就会报错：

{
    "non_field_errors": [
        "字段 user, goods 必须能构成唯一集合。"
    ]
}

 

 

还有一种方法：

https://www.django-rest-framework.org/api-guide/validators/#uniquetogethervalidator

 

        validators = [
            UniqueTogetherValidator(
                queryset=UserFav.objects.all(),
                fields=('user', 'goods')
            )
        ]