restful-framwork-創(chuàng)新互聯(lián)

1.RESTful規(guī)范

一  面向資源編程
　　每個(gè)URL代表一種資源，URL中盡量不要用動(dòng)詞，要用名詞。

二  根據(jù)method不同，進(jìn)行不同的操作
　　GET/POST/PUT/DELETE/PATCH

三  在URL中體現(xiàn)版本
　　https://www.bootcss.com/v1/mycss
　　https://v1.bootcss.com/mycss

四  在URL中體現(xiàn)是否是API
　　https://www.bootcss.com/api/mycss
　　https://api.bootcss.com/mycss

五  在URL中的過濾條件
　　https://www.bootcss.com/v1/mycss？page=3

六  盡量使用HTTPS
　　https://www.bootcss.com/v1/mycss

七  響應(yīng)時(shí)設(shè)置狀態(tài)碼
　　1**   信息，服務(wù)器收到請(qǐng)求，需要請(qǐng)求者繼續(xù)執(zhí)行操作
　　2**  成功，操作被成功接收并處理
　　3**  重定向，需要進(jìn)一步的操作以完成請(qǐng)求
　　4**  客戶端錯(cuò)誤，請(qǐng)求包含語法錯(cuò)誤或無法完成請(qǐng)求
　　5**  服務(wù)器錯(cuò)誤，服務(wù)器在處理請(qǐng)求的過程中發(fā)生了錯(cuò)誤

八  返回值
　　GET請(qǐng)求 返回查到所有或單條數(shù)據(jù)
　　POST請(qǐng)求  返回新增的數(shù)據(jù)
　　PUT請(qǐng)求  返回更新數(shù)據(jù)
　　PATCH請(qǐng)求  局部更新  返回更新整條數(shù)據(jù)
　　DELETE請(qǐng)求  返回值為空

九  返回錯(cuò)誤信息
　　返回值攜帶錯(cuò)誤信息

十   Hypermedia API
　　如果遇到需要跳轉(zhuǎn)的情況 攜帶跳轉(zhuǎn)接口的URL
　　ret = {
                code: 1000,
                data:{
                    id:1,
                    name:'小強(qiáng)',
                    depart_id:http://www.luffycity.com/api/v1/depart/8/
                }
            }

2.DRF序列化

2.1為什么要使用DRF來序列化

當(dāng)我們做前后端分離的項(xiàng)目~~我們前后端交互一般都選擇JSON數(shù)據(jù)格式，JSON是一個(gè)輕量級(jí)的數(shù)據(jù)交互格式。
那么我們給前端數(shù)據(jù)的時(shí)候都要轉(zhuǎn)成json格式，那就需要對(duì)我們從數(shù)據(jù)庫(kù)拿到的數(shù)據(jù)進(jìn)行序列化。
接下來我們看下django序列化和rest_framework序列化的對(duì)比~~

2.2Django的序列化

#1.Jsonresponse序列化方式

class BooksView(View):
    def get(self, request):
        book_list = Book.objects.values("id", "title", "chapter", "pub_time", "publisher")
        book_list = list(book_list)
        # 如果我們需要取外鍵關(guān)聯(lián)的字段信息 需要循環(huán)獲取外鍵 再去數(shù)據(jù)庫(kù)查然后拼接成我們想要的
        ret = []
        for book in book_list:
            pub_dict = {}
            pub_obj = Publish.objects.filter(pk=book["publisher"]).first()
            pub_dict["id"] = pub_obj.pk
            pub_dict["title"] = pub_obj.title
            book["publisher"] = pub_dict
            ret.append(book)
        ret = json.dumps(book_list, ensure_ascii=False, cls=MyJson)
        return HttpResponse(ret)

# json.JSONEncoder.default()
# 解決json不能序列化時(shí)間字段的問題
class MyJson(json.JSONEncoder):
    def default(self, field):
        if isinstance(field, datetime.datetime):
            return field.strftime('%Y-%m-%d %H:%M:%S')
        elif isinstance(field, datetime.date):
            return field.strftime('%Y-%m-%d')
        else:
            return json.JSONEncoder.default(self, field)

#2.Django序列化方法
from django.core import serializers

# 能夠得到我們要的效果 結(jié)構(gòu)有點(diǎn)復(fù)雜
class BooksView(View):
    def get(self, request):
        book_list = Book.objects.all()
        ret = serializers.serialize("json", book_list)
        return HttpResponse(ret)

2.3DRF的序列化

2.3.1drf序列化

-- Django我們CBV繼承類是View，現(xiàn)在DRF我們要用APIView
-- Django中返回的時(shí)候我們用HTTPResponse，JsonResponse，render ，DRF我們用Response

from rest_framework import serializers
class BookSerializer(serializers.Serializer):
    id = serializers.IntegerField()
    title = serializers.CharField(max_length=32)
    CHOICES = ((1, "Linux"), (2, "Django"), (3, "Python"))
    # 這是為了顯示choice字段的值
    chapter = serializers.ChoiceField(choices=CHOICES, source="get_category_display")
    pub_time = serializers.DateField()

from rest_framework.views import APIView
from rest_framework.response import Response
from app.models import Book, Publisher

from app.serializers import BookSerializer
class BookView(APIView):
    def get(self, request):
        book_list = Book.objects.all()
        ret = BookSerializer(book_list, many=True)
        return Response(ret.data)

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2.3.2外鍵關(guān)系序列化

#serialisers.py

from django.db import models

# Create your models here.

__all__ = ["Book", "Publisher", "Author"]

class Book(models.Model):
    title = models.CharField(max_length=32, verbose_name="圖書名稱")
    CHOICES = ((1, "Python"), (2, "Go"), (3, "Linux"))
    category = models.IntegerField(choices=CHOICES, verbose_name="圖書的類別")
    pub_time = models.DateField(verbose_name="圖書的出版日期")
    publisher = models.ForeignKey(to="Publisher", on_delete=None)
    author = models.ManyToManyField(to="Author")
    def __str__(self):
        return self.title

    class Meta:
        verbose_name_plural = "book"

class Publisher(models.Model):
    title = models.CharField(max_length=32, verbose_name="出版社的名稱")
    def __str__(self):
        return self.title

    class Meta:
        verbose_name_plural = "publish"

class Author(models.Model):
    name = models.CharField(max_length=32, verbose_name="作者的姓名")
    def __str__(self):
        return self.name

    class Meta:
        verbose_name_plural = "author"

#views.py

from rest_framework.views import APIView
from rest_framework.response import Response
from app.models import Book, Publisher

from app.serializers import BookSerializer
class BookView(APIView):
    def get(self, request):
        book_list = Book.objects.all()
        ret = BookSerializer(book_list, many=True)
        return Response(ret.data)

2.3.3DRF反序列化

當(dāng)前端給我們發(fā)post的請(qǐng)求的時(shí)候~前端給我們傳過來的數(shù)據(jù)~我們要進(jìn)行一些校驗(yàn)然后保存到數(shù)據(jù)庫(kù)~
這些校驗(yàn)以及保存工作，DRF的Serializer也給我們提供了一些方法了~~
首先~我們要寫反序列化用的一些字段~有些字段要跟序列化區(qū)分開~
Serializer提供了.is_valid()  和.save()方法~~

使用write_only=True，read_only=True區(qū)別序列化字段和反序列化字段
必須重寫create方法

from rest_framework import serializers
from .models import Book

class PublisherSerializer(serializers.Serializer):
    id = serializers.IntegerField()
    title = serializers.CharField(max_length=32)

class AuthorSerializer(serializers.Serializer):
    id = serializers.IntegerField()
    name = serializers.CharField(max_length=32)

book_obj = {
        "title": "vita的使用教程",
        "w_category": 1,
        "pub_time": "2018-10-09",
        "publisher_id": 1,
        "author_list": [1, 2]
    }
class BookSerializer(serializers.Serializer):
    # 插入數(shù)據(jù)時(shí)id自動(dòng)生成，不需要校驗(yàn)
    id = serializers.IntegerField(required=False)
    title = serializers.CharField(max_length=32)
    CHOICES = ((1, "Python"), (2, "Go"), (3, "Linux"))
    # read_only=True只在序列化的時(shí)候使用
    category = serializers.ChoiceField(choices=CHOICES, source="get_category_display", read_only=True)
    pub_time = serializers.DateField()
    # write_only=True反序列化的字段，只在反序列化的時(shí)候使用，即保存數(shù)據(jù)的時(shí)候使用
    w_category = serializers.ChoiceField(choices=CHOICES, write_only=True)
    # 只在反序列化的時(shí)候使用，插入數(shù)據(jù)的時(shí)候，只需要插入publisher_id就可以了
    publisher_id = serializers.IntegerField(write_only=True)
    # 一定要加上read_only=True,否則在插入數(shù)據(jù)的時(shí)候，提示該字段必須添加
    publisher = PublisherSerializer(read_only=True)
    # 指明是多對(duì)多的外鍵關(guān)系
    author = AuthorSerializer(many=True, read_only=True)
    # 同樣，只在反序列化，保存數(shù)據(jù)的時(shí)候使用
    author_list = serializers.ListField(write_only=True)

    def create(self, validated_data):
        """
        反序列化的時(shí)候，一定要寫create方法
        :param validated_data:
        :return:
        """
        book = Book.objects.create(title=validated_data["title"], category=validated_data["w_category"],
                                pub_time=validated_data["pub_time"], publisher_id=validated_data["publisher_id"])
        # 多對(duì)多的創(chuàng)建
        book.author.add(*validated_data["author_list"])
        return book

#views.py

from rest_framework.views import APIView
from rest_framework.response import Response
from app.models import Book, Publisher

from app.serializers import BookSerializer
class BookView(APIView):
    def get(self, request):
        book_list = Book.objects.all()
        ret = BookSerializer(book_list, many=True)
        return Response(ret.data)

    def post(self, request):
        """
        反序列化，保存數(shù)據(jù)
        :param request:
        :return:
        """
        print(request.data)
        serializer = BookSerializer(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data)
        else:
            return Response(serializer.errors)

2.3.5獲取單條數(shù)據(jù)

#urls.py

from django.contrib import admin
from django.urls import path,include
from app.views import BookView,BookEditView
urlpatterns = [
    path('admin/', admin.site.urls),
    path('list', BookView.as_view()),
    path('retrieve/<int:id>', BookEditView.as_view()),
]

#views.py

class BookEditView(APIView):

    def get(self, request, id):
        """
        獲取單條數(shù)據(jù)的接口
        :param request:
        :param id:
        :return:
        """
        book_obj = Book.objects.filter(id=id).first()
        ret = BookSerializer(book_obj)
        return Response(ret.data)

2.3.6PUT請(qǐng)求的部分驗(yàn)證

# views.py
class BookEditView(APIView):

    def get(self, request, id):
        """
        獲取單條數(shù)據(jù)的接口
        :param request:
        :param id:
        :return:
        """
        book_obj = Book.objects.filter(id=id).first()
        ret = BookSerializer(book_obj)
        return Response(ret.data)

    def put(self, request, id):
        """
        用戶提交Put請(qǐng)求
        :param request: 
        :param id: 
        :return: 
        """
        book_obj = Book.objects.filter(id=id).first()
        #  partial=True允許部分校驗(yàn)
        serializer = BookSerializer(book_obj, data=request.data, partial=True)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data)
        else:
            return Response(serializer.errors)

from rest_framework import serializers
from .models import Book

class PublisherSerializer(serializers.Serializer):
    id = serializers.IntegerField()
    title = serializers.CharField(max_length=32)

class AuthorSerializer(serializers.Serializer):
    id = serializers.IntegerField()
    name = serializers.CharField(max_length=32)

book_obj = {
        "title": "vita的使用教程",
        "w_category": 1,
        "pub_time": "2018-10-09",
        "publisher_id": 1,
        "author_list": [1, 2]
    }
put_data = {
    "title": "vita的使用教程2"
}
class BookSerializer(serializers.Serializer):
    # 插入數(shù)據(jù)時(shí)id自動(dòng)生成，不需要校驗(yàn)
    id = serializers.IntegerField(required=False)
    title = serializers.CharField(max_length=32)
    CHOICES = ((1, "Python"), (2, "Go"), (3, "Linux"))
    # read_only=True只在序列化的時(shí)候使用
    category = serializers.ChoiceField(choices=CHOICES, source="get_category_display", read_only=True)
    pub_time = serializers.DateField()
    # write_only=True反序列化的字段，只在反序列化的時(shí)候使用，即保存數(shù)據(jù)的時(shí)候使用
    w_category = serializers.ChoiceField(choices=CHOICES, write_only=True)
    # 只在反序列化的時(shí)候使用，插入數(shù)據(jù)的時(shí)候，只需要插入publisher_id就可以了
    publisher_id = serializers.IntegerField(write_only=True)
    # 一定要加上read_only=True,否則在插入數(shù)據(jù)的時(shí)候，提示該字段必須添加
    publisher = PublisherSerializer(read_only=True)
    # 指明是多對(duì)多的外鍵關(guān)系
    author = AuthorSerializer(many=True, read_only=True)
    # 同樣，只在反序列化，保存數(shù)據(jù)的時(shí)候使用
    author_list = serializers.ListField(write_only=True)

    def create(self, validated_data):
        """
        反序列化的時(shí)候，一定要寫create方法
        :param validated_data:
        :return:
        """
        book = Book.objects.create(title=validated_data["title"], category=validated_data["w_category"],
                                pub_time=validated_data["pub_time"], publisher_id=validated_data["publisher_id"])
        # 多對(duì)多的創(chuàng)建
        book.author.add(*validated_data["author_list"])
        return book
    def update(self, instance, validated_data):
        """
        Put請(qǐng)求的方法
        :param instance:
        :param validated_data:
        :return:
        """
        #如果該字段沒有，就使用原來的數(shù)據(jù)
        instance.title = validated_data.get("title", instance.title)
        instance.category = validated_data.get("category", instance.category)
        instance.pub_time = validated_data.get("pub_time", instance.pub_time)
        instance.publisher_id = validated_data.get("publisher_id", instance.publisher_id)
        # 多對(duì)多的處理，如果用戶傳了該字段，就更新
        if validated_data.get("author_list"):
            instance.author.set(validated_data["author_list"])
        instance.save()
        return instance

2.3.7DRF驗(yàn)證

def my_validate(value):
    """
    全局驗(yàn)證
    :param value:
    :return:
    """
    if "敏感信息" in value.lower():
        raise serializers.ValidationError("不能含有敏感信息")
    else:
        return value
class BookSerializer(serializers.Serializer):
    # 插入數(shù)據(jù)時(shí)id自動(dòng)生成，不需要校驗(yàn)
    id = serializers.IntegerField(required=False)
    title = serializers.CharField(max_length=32, validators=[my_validate])
    CHOICES = ((1, "Python"), (2, "Go"), (3, "Linux"))
    # read_only=True只在序列化的時(shí)候使用
    category = serializers.ChoiceField(choices=CHOICES, source="get_category_display", read_only=True)
    pub_time = serializers.DateField()
    # write_only=True反序列化的字段，只在反序列化的時(shí)候使用，即保存數(shù)據(jù)的時(shí)候使用
    w_category = serializers.ChoiceField(choices=CHOICES, write_only=True)
    # 只在反序列化的時(shí)候使用，插入數(shù)據(jù)的時(shí)候，只需要插入publisher_id就可以了
    publisher_id = serializers.IntegerField(write_only=True)
    # 一定要加上read_only=True,否則在插入數(shù)據(jù)的時(shí)候，提示該字段必須添加
    publisher = PublisherSerializer(read_only=True)
    # 指明是多對(duì)多的外鍵關(guān)系
    author = AuthorSerializer(many=True, read_only=True)
    # 同樣，只在反序列化，保存數(shù)據(jù)的時(shí)候使用
    author_list = serializers.ListField(write_only=True)

    def create(self, validated_data):
        """
        反序列化的時(shí)候，一定要寫create方法
        :param validated_data:
        :return:
        """
        book = Book.objects.create(title=validated_data["title"], category=validated_data["w_category"],
                                pub_time=validated_data["pub_time"], publisher_id=validated_data["publisher_id"])
        # 多對(duì)多的創(chuàng)建
        book.author.add(*validated_data["author_list"])
        return book
    def update(self, instance, validated_data):
        """
        Put請(qǐng)求的方法
        :param instance:
        :param validated_data:
        :return:
        """
        #如果該字段沒有，就使用原來的數(shù)據(jù)
        instance.title = validated_data.get("title", instance.title)
        instance.category = validated_data.get("category", instance.category)
        instance.pub_time = validated_data.get("pub_time", instance.pub_time)
        instance.publisher_id = validated_data.get("publisher_id", instance.publisher_id)
        # 多對(duì)多的處理，如果用戶傳了該字段，就更新
        if validated_data.get("author_list"):
            instance.author.set(validated_data["author_list"])
        instance.save()
        return instance

    def validate_title(self, value):
        """
        單個(gè)字段的驗(yàn)證
        :param value:
        :return:
        """
        if "python" not in value.lower():
            raise serializers.ValidationError("標(biāo)題必須含有python")
        return value

    def validate(self, attrs):
        """
        多個(gè)字段的驗(yàn)證
        :param attrs:
        :return:
        """
        if attrs["w_category"] == 1 and attrs["publisher_id"] == 1:
            return attrs
        else:
            raise serializers.ValidationError("分類以及標(biāo)題不符合要求")

2.3.8 ModelSerializer

現(xiàn)在我們已經(jīng)清楚了Serializer的用法，會(huì)發(fā)現(xiàn)我們所有的序列化跟我們的模型都緊密相關(guān)~
那么，DRF也給我們提供了跟模型緊密相關(guān)的序列化器~~ModelSerializer~~
　　-- 它會(huì)根據(jù)模型自動(dòng)生成一組字段
　　-- 它簡(jiǎn)單的默認(rèn)實(shí)現(xiàn)了.update()以及.create()方法

2.3.8.1定義一個(gè)ModelSerializer序列化器

class BookSerializer(serializers.ModelSerializer):
    class Meta:
        model = Book
        fields = "__all__"
        # fields = ["id", "title", "pub_time"]
        # exclude = ["user"]
        # 分別是所有字段 包含某些字段 排除某些字段

2.3.8.2外鍵關(guān)系的序列化

class BookSerializer(serializers.ModelSerializer):
    class Meta:
        model = Book
        fields = "__all__"
        # fields = ["id", "title", "pub_time"]
        # exclude = ["user"]
        # 分別是所有字段 包含某些字段 排除某些字段
        depth = 1
# depth 代表找嵌套關(guān)系的第幾層

2.3.8.3自定義字段

我們可以聲明一些字段來覆蓋默認(rèn)字段，來進(jìn)行自定制~
比如我們的選擇字段，默認(rèn)顯示的是選擇的key，我們要給用戶展示的是value。

class BookSerializer(serializers.ModelSerializer):
    chapter = serializers.CharField(source="get_chapter_display", read_only=True)

    class Meta:
        model = Book
        fields = "__all__"
        # fields = ["id", "title", "pub_time"]
        # exclude = ["user"]
        # 分別是所有字段 包含某些字段 排除某些字段
        depth = 1

2.3.8.4meta中其他關(guān)鍵字參數(shù)

class BookSerializer(serializers.ModelSerializer):
    chapter = serializers.CharField(source="get_chapter_display", read_only=True)

    class Meta:
        model = Book
        fields = "__all__"
        # fields = ["id", "title", "pub_time"]
        # exclude = ["user"]
        # 分別是所有字段 包含某些字段 排除某些字段
        depth = 1
        read_only_fields = ["id"]
        extra_kwargs = {"title": {"validators": [my_validate,]}}

2.3.8.5post以及patch請(qǐng)求

由于depth會(huì)讓我們外鍵變成只讀，所以我們?cè)俣x一個(gè)序列化的類，其實(shí)只要去掉depth就可以了~~

class BookSerializer(serializers.ModelSerializer):
    chapter = serializers.CharField(source="get_chapter_display", read_only=True)

    class Meta:
        model = Book
        fields = "__all__"
        # fields = ["id", "title", "pub_time"]
        # exclude = ["user"]
        # 分別是所有字段 包含某些字段 排除某些字段
        read_only_fields = ["id"]
        extra_kwargs = {"title": {"validators": [my_validate,]}}

2.3.8.6SerializerMethodField

外鍵關(guān)聯(lián)的對(duì)象有很多字段我們是用不到的~都傳給前端會(huì)有數(shù)據(jù)冗余~就需要我們自己去定制序列化外鍵對(duì)象的哪些字段~~

class BookSerializer(serializers.ModelSerializer):
    chapter = serializers.CharField(source="get_chapter_display", read_only=True)
    user = serializers.SerializerMethodField()
    publisher = serializers.SerializerMethodField()

    def get_user(self, obj):
        # obj是當(dāng)前序列化的book對(duì)象
        users_query_set = obj.user.all()
        return [{"id": user_obj.pk, "name": user_obj.name} for user_obj in users_query_set]

    def get_publisher(self, obj):
        publisher_obj = obj.publisher
        return {"id": publisher_obj.pk, "title": publisher_obj.title}

    class Meta:
        model = Book
        fields = "__all__"
        # fields = ["id", "title", "pub_time"]
        # exclude = ["user"]
        # 分別是所有字段 包含某些字段 排除某些字段
        read_only_fields = ["id"]
        extra_kwargs = {"title": {"validators": [my_validate,]}

2.3.8.7用ModelSerializer改進(jìn)上面Serializer的完整版

class BookSerializer(serializers.ModelSerializer):
    dis_chapter = serializers.SerializerMethodField(read_only=True)
    users = serializers.SerializerMethodField(read_only=True)
    publishers = serializers.SerializerMethodField(read_only=True)

    def get_users(self, obj):
        # obj是當(dāng)前序列化的book對(duì)象
        users_query_set = obj.user.all()
        return [{"id": user_obj.pk, "name": user_obj.name} for user_obj in users_query_set]

    def get_publishers(self, obj):
        publisher_obj = obj.publisher
        return {"id": publisher_obj.pk, "title": publisher_obj.title}

    def get_dis_chapter(self, obj):
        return obj.get_chapter_display()

    class Meta:
        model = Book
        # fields = "__all__"
        # 字段是有序的
        fields = ["id", "title","dis_chapter", "pub_time", "publishers", "users","chapter", "user", "publisher"]
        # exclude = ["user"]
        # 分別是所有字段 包含某些字段 排除某些字段
        read_only_fields = ["id", "dis_chapter", "users", "publishers"]
        extra_kwargs = {"title": {"validators": [my_validate,]}, "user": {"write_only": True}, "publisher": {"write_only": True},
                        "chapter": {"write_only": True}}

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