【原】python測(cè)試開發(fā)django-65.序列化(ModelSerializer)

上海悠悠 2021-05-27

展開全文

前言

serializers.Serializer可以對(duì)modle模型中的字段序列化，并且必須寫create和update兩個(gè)方法,。ModelSerializer可以看成是Serializer的一個(gè)升級(jí)版,，功能更強(qiáng)大,，更方便,。
實(shí)際上ModelSerializer類繼承了Serializer類,。

ModelSerializer

ModelSerializer類能夠讓你自動(dòng)創(chuàng)建一個(gè)具有模型中相應(yīng)字段的Serializer類,。這個(gè)ModelSerializer類和常規(guī)的Serializer類一樣,，不同的是：

它根據(jù)模型自動(dòng)生成一組字段。
它自動(dòng)生成序列化器的驗(yàn)證器,，比如unique_together驗(yàn)證器,。
它默認(rèn)簡(jiǎn)單實(shí)現(xiàn)了.create()方法和.update()方法,。

比如我們創(chuàng)建的一個(gè)模型models.py

# models.py
from django.db import models
# 作者：上海悠悠，QQ交流群：750815713

# Create your models here.
class UserPersonalInfo(models.Model):
    '''用戶個(gè)人信息'''
    name = models.CharField(max_length=10, verbose_name="昵稱")  # 昵稱
    sex_choices = (
        (u'M', u'男'),
        (u'F', u'女'),
    )
    sex = models.CharField(max_length=11,
                           choices=sex_choices,
                           verbose_name="性別",
                            )
    age = models.IntegerField(verbose_name="年齡",  default="", blank=True)
    mail = models.EmailField(max_length=30, default="", blank=True)
    create_time = models.DateField(auto_now=True, verbose_name="添加時(shí)間")

使用ModelSerializer序列化后如下

# serializersapi.py
from rest_framework import serializers
from .models import UserPersonalInfo
# 作者：上海悠悠,，QQ交流群：750815713

class UserInfoSerializer(serializers.ModelSerializer):
    class Meta:
        model = UserPersonalInfo
        fields = '__all__'

fields參數(shù)設(shè)置為'__all__'會(huì)默認(rèn)序列化所有的字段,，可以在django shell交互模式查看

D:\soft\yoyoapi>python manage.py shell
Python 3.6.0 (v3.6.0:41df79263a11, Dec 23 2016, 08:06:12) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> from apiapp.serializersapi import UserInfoSerializer
>>> serializer = UserInfoSerializer()
>>> print(repr(serializer))
UserInfoSerializer():
    id = IntegerField(label='ID', read_only=True)
    name = CharField(label='昵稱', max_length=10)
    sex = ChoiceField(choices=(('M', '男'), ('F', '女')), label='性別')
    age = IntegerField(label='年齡', max_value=2147483647, min_value=-2147483648, required=False)
    mail = EmailField(allow_blank=True, max_length=30, required=False)
    create_time = DateField(label='添加時(shí)間', read_only=True)
>>>

fields指定要包括的字段

如果我只想要其中的幾個(gè)字段，如’id’, 'name’, 'mail’, 'create_time’,，那么fields參數(shù)可以設(shè)置成元組類型

# serializersapi.py
from rest_framework import serializers
from .models import UserPersonalInfo
# 作者：上海悠悠,，QQ交流群：750815713

class UserInfoSerializer(serializers.ModelSerializer):
    class Meta:
        model = UserPersonalInfo
        fields = ('id', 'name', 'mail', 'create_time')

修改代碼后，需exit()退出shell,，再重新進(jìn),。django shell交互模式運(yùn)行查看結(jié)果

D:\soft\yoyoapi>python manage.py shell
Python 3.6.0 (v3.6.0:41df79263a11, Dec 23 2016, 08:06:12) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> from apiapp.serializersapi import UserInfoSerializer
>>> serializer = UserInfoSerializer()
>>> print(repr(serializer))
UserInfoSerializer():
    id = IntegerField(label='ID', read_only=True)
    name = CharField(label='昵稱', max_length=10)
    mail = EmailField(allow_blank=True, max_length=30, required=False)
    create_time = DateField(label='添加時(shí)間', read_only=True)
>>>

exclude排除字段列表

與fields屬性設(shè)置相反的是，可以用exclude排除部分字段

# serializersapi.py
from rest_framework import serializers
from .models import UserPersonalInfo
# 作者：上海悠悠,，QQ交流群：750815713

class UserInfoSerializer(serializers.ModelSerializer):
    class Meta:
        model = UserPersonalInfo
        # fields = ('id', 'name', 'mail', 'create_time')
        exclude = ('id', 'sex', 'age')

django shell交互模式查看結(jié)果

# 作者：上海悠悠,，QQ交流群：750815713
D:\soft\yoyoapi>python manage.py shell
Python 3.6.0 (v3.6.0:41df79263a11, Dec 23 2016, 08:06:12) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> from apiapp.serializersapi import UserInfoSerializer
>>> serializer = UserInfoSerializer()
>>> print(repr(serializer))
UserInfoSerializer():
    name = CharField(label='昵稱', max_length=10)
    mail = EmailField(allow_blank=True, max_length=30, required=False)
    create_time = DateField(label='添加時(shí)間', read_only=True)
>>>

上面例子中用 exclude參數(shù)會(huì)排除掉’id’, 'sex’, 'age’這三個(gè)參數(shù)。

案例操作

接下來(lái)使用serializers.ModelSerializer序列化后(設(shè)置fields = 'all'),，寫個(gè)簡(jiǎn)單的案例,，編輯views.py視圖,在上一篇基礎(chǔ)上，改這一句即可

verify_data = UserInfoSerializer(data=request.data) # 只改這里

# views.py
from rest_framework.response import Response
from rest_framework.views import APIView
from .models import *
from rest_framework.permissions import IsAuthenticated,AllowAny
from .serializersapi import UserInfoSerializer

class UserInfoView(APIView):
    '''REST framework的APIView實(shí)現(xiàn)獲取card列表 # 作者：上海悠悠,，QQ交流群：750815713'''
    # authentication_classes = (TokenAuthentication,)  # token認(rèn)證
    # permission_classes = (IsAuthenticated,)   # IsAuthenticated 僅通過(guò)認(rèn)證的用戶
    permission_classes = (AllowAny,)  # 允許所有用戶

    def get(self, request, format=None):
        """
        Return a list of all UserPersonalInfo
        """
        info = UserPersonalInfo.objects.all()
        serializer = UserInfoSerializer(info, many=True)
        return Response(serializer.data)

    def post(self, request, format=None):
        '''
        create UserPersonalInfo
        '''
        verify_data = UserInfoSerializer(data=request.data)  # 只改這里
        if verify_data.is_valid():
            verify_data.save()
            return Response({"message": "create some data!", "data": request.data})
        else:
            return Response(verify_data.errors)

urls.py設(shè)置訪問(wèn)地址

# urls.py
from apiapp import views
from django.conf.urls import url

# 作者：上海悠悠,，QQ交流群：750815713

urlpatterns = [
    url(r'^info', views.UserPersonalInfoView.as_view()),
]