rest_framework 序列化

1.common

serializer.py

#/usr/bin/env python3
# -*- coding:utf-8 -*-
#   mail: infaaf@126.com

from app01.models import UserGroup,UserInfo,Role
from rest_framework import  serializers
from app01 import models

class UserInfoSerializer(serializers.Serializer):
    ut=serializers.CharField(source='get_user_type_display')
    username=serializers.CharField()
    password=serializers.CharField()
    group=serializers.CharField(source='group.title')
    rls=serializers.SerializerMethodField()   # 或models中定制方法source参数引用

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

class UserInfoSerializer2(serializers.ModelSerializer):
    ut = serializers.CharField(source='get_user_type_display')
    group=serializers.CharField(source='group.title')
    rls=serializers.SerializerMethodField()

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

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


class UserInfoSerializer3(serializers.ModelSerializer):
    class Meta:
        model=models.UserInfo
        # fields='__all__'
        fields='__all__'
        depth = 1    #  Foreignkey和manytomany 自动获取详细。 choice仍需手动处理


class XXX:
    def __init__(self,base):
        self.base=base

    def __call__(self, value):
        if not value.startwith(self.base):
            message='false'
            raise serializers.ValidationError(message)


class UserInfoSerializerXXX(serializers.Serializer):
    # 校验字段
    name=serializers.CharField(error_messages={'required':'标题不能为空'})
    
    # 利用validators
    XX=serializers.CharField(validators=[XXX('basename')])

    # 利用hook
    xx2=serializers.CharField()
    def validate_xx2(self,value):
        if value:
            return value

        # from rest_framework import exceptions
        # raise exceptions.ValidationError('xxx')

views.py

from django.shortcuts import render,HttpResponse

# Create your views here.
from app01.models import UserGroup,UserInfo,Role
from rest_framework.views import APIView

from rest_framework.versioning import  QueryParameterVersioning,URLPathVersioning
from django.urls import reverse
from rest_framework.parsers import JSONParser,FormParser
from app01.serializer import UserInfoSerializer,UserInfoSerializer2,UserInfoSerializer3,UserInfoSerializerXXX
import json

class D(APIView):

    versioning_class = URLPathVersioning
    parser_classes=[JSONParser,FormParser]   # print(request.data)
    def get(self,request,*args,**kwargs):
        print(kwargs.get('version'))
        print("##")
        print(request.version)
        print(request.versioning_scheme.reverse(viewname='userapi',request=request))
        r=reverse(viewname='userapi',kwargs={'version':'v1'})
        print(r)
        print(request.body)
        return HttpResponse('ok')

    def post(self,request,*args,**kwargs):
        # self.dispatch()
        print(request._request)
        pass



class SerView(APIView):
    def get(self, request, *args, **kwargs):
        userinfo_obj=UserInfo.objects.all()
        ser=UserInfoSerializer3(instance=userinfo_obj,many=True)
        ret=json.dumps(ser.data,ensure_ascii=False)
        return HttpResponse(ret)

    def post(self, request, *args, **kwargs):
        ser=UserInfoSerializerXXX(data=request.data)
        if ser.is_valid():
            print(ser.validated_data)
        else:
            print(ser.errors)
        return HttpResponse('wrong')

models.py

#/usr/bin/env python3
# -*- coding:utf-8 -*-
#   mail: infaaf@126.com
from django.db import models
from rest_framework import request

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

    def __str__(self):
        return self.title


class UserInfo(models.Model):
    user_type_choice=((1,'普通用户'),
                      (2,'vip'),
                      (3,'SVIP'))
    user_type = models.IntegerField(choices=user_type_choice)
    username=models.CharField(max_length=32)
    password=models.CharField(max_length=64)
    group=models.ForeignKey('UserGroup',on_delete=None)
    roles=models.ManyToManyField('Role')

    def __str__(self):
        return self.username

class UserToken(models.Model):
    user=models.OneToOneField(UserInfo,on_delete=None)
    token=models.CharField(max_length=64)

    def __str__(self):
        return self.token


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

    def __str__(self):
        return self.title

2. extra

hylinkedModelSerializer 使用url替代id。 这里额外定制了field信息

class ProfileSerializer(serializers.HyperlinkedModelSerializer):

    url = serializers.HyperlinkedIdentityField(
            view_name='profile-detail',
            lookup_field='id'
        )

    owner = serializers.HyperlinkedIdentityField(
            view_name='user-detail',
            lookup_field='id'
        )

    class Meta:
        model = Profile
        fields = ( 'url', 'city', 'owner')