rest_framework 序列化篇

感谢alex和武沛齐老师

rest_framework中的序列化表示

from rest_framework import serializers
class RoleSerializer(serializers.Serializer):
    id = serializers.IntegerField()
    title = serializers.CharField()


class RolesView(APIView):
    def get(self, request, *args, **kwargs):
        #方式1
        #roles = models.Role.objects.all().values('id','title')
        #roles = list(roles)
        #ret = json.dumps(roles, ensure_ascii=False)

        #方式2 对queryset的格式进行序列化
        roles = models.Role.objects.all()
        ser = RolesSerializer(instance=roles, many=True)
        ret = json.dumps(ser.data, ensure_ascii=False)
        return HttpResponse(ret)

        #方式2 单个对象
        roles = models.Role.objects.all().first()
        ser = RolesSerializer(instance=roles, many=False)
        #ser.data 已经是完成序列化的结果了
        ret = json.dumps(ser.data, ensure_ascii=False)
        return HttpResponse(ret)

def func(arg):
    if callable(arg):
        print(arg())

    else:
        print(arg)

func(123)
func(lambda:"666")

序列化
    部分总结：
    1.写类
        继承下面两种
        class RolesSerializer(serializers.Serializer):
            id = serializers.IntegerFiled()
            title = serializers.CharField()

        class UserInfoSerializer(serializers.ModelSerializer):
            class Meta:
                model = models.UserInfo
                #fileds = "__all__"
                fields = ['id', 'username', 'password']

        2.字段
            a. title = serializers.CharField(source = 'group.title')
            b. title = serializers.SerializerMethodField()
                class UserInfoSerializer(serializers.ModelSerializer):
                    rls = serializers.SerializerMethodField() #自定义显示

                    class Meta:
                        model = models.UserInfo
                        fields = ['id', 'username', 'password', 'rls',]

                     #自定义方法
                    def get_rls(self, row)
                        role_obj_list = row.roles.all()

                        ret = []

                        for item in role_obj_list:
                            ret.append({'id':item.id, 'title':item.title})
                        return ret

            c.自定义类  不过用得少

视图函数中
from cmdb import models
from rest_framework import serializers

#方式1 序列化
# class UserInfoSerializer(serializers.Serializer):
#     username = serializers.CharField()
#     password = serializers.CharField()
#     xxxx = serializers.CharField(source="user_type")  #source表示对应数据库的某个字段 此时就可以改变变量了 row.get_user_type_display 不可执行
#     oooo = serializers.CharField(source="get_user_type_display")  #对choices数据进行获取中文   可执行
#
#     group = serializers.CharField(source="group.title") #foreignkey 进行.操作 跨表
#     #rls = serializers.CharField(source='roles.all')
#     #如果是单个表和foreignkey可以通过source去指定 不能指定manytomany
#
#     rls = serializers.SerializerMethodField()#自定义显示
#     def get_rls(self, row):
#         role_obj_list = row.roles.all()
#         ret = []
#         for item in role_obj_list:
#             ret.append({'id':item.id,"title":item.title})
#         return ret

#方式2  #地址  www.cnblogs.com/wupeiqi/articles/7805382.html
#方式2可以与方式1中的数据混合着使用
class UserInfoSerializer(serializers.ModelSerializer):
    oooo = serializers.CharField(source="get_user_type_display")
    rls = serializers.SerializerMethodField()
    group = serializers.CharField(source='group.title')
    class Meta:
        model = models.UserInfo
        #fields = "__all__"   #这一步已经可以完成基本的所有数据的显示
        fields = ['id','username','password','oooo','rls','group']


    def get_rls(self, row):
        role_obj_list = row.roles.all()
        ret = []
        for item in role_obj_list:
            ret.append({'id':item.id, 'title':item.title})
            return ret

import json
class UserInfoView(APIView):
    def get(self, request, *args, **kwargs):
        users = models.UserInfo.objects.all()
        ser = UserInfoSerializer(instance=users,many=True)
        print(ser.data)

        ret = json.dumps(ser.data, ensure_ascii=False)
        return HttpResponse(ret)


 urls.py中
 from django.conf.urls import url,include
from cmdb import views
urlpatterns = [
    url(r'^(?P<version>[v1|v2]+)/userinfo/$',views.UserInfoView.as_view()),
]

models.py中
from django.db import models

# Create your models here.
class UserGroup(models.Model):
    title = models.CharField(max_length=32)

class UserInfo(models.Model):
    user_type_choices = (
        (1,'普通用户'),
        (2,'VIP'),
        (3,'SVIP'),
   )
    user_type = models.IntegerField(choices=user_type_choices)
    group = models.ForeignKey(to="UserGroup", on_delete=models.CASCADE)

    username = models.CharField(max_length=32, unique=True)
    password = models.CharField(max_length=64)

    roles = models.ManyToManyField(to="Role")

class UserToken(models.Model):
    user = models.OneToOneField(to="UserInfo", on_delete=models.CASCADE)
    token = models.CharField(max_length=64)

class Role(models.Model):
    title = models.CharField(max_length=32)