五個介面中，只有獲取所有需要過濾，其他不需要

內建過濾

　　匯入

from rest_framework.filters import SearchFilter

　　在檢視類中寫

from .models import Book
from .serizlizer import BookSerizlizer
from rest_framework.generics import ListAPIView
from rest_framework.viewsets import ViewSetMixin, GenericViewSet
from rest_framework.filters import
 
 SearchFilter
from rest_framework.mixins import ListModelMixin


# class BookView(ViewSetMixin, ListAPIView):
class BookView(GenericViewSet, ListModelMixin):
    queryset = Book.objects.all()
    serializer_class = BookSerizlizer
    filter_backends = [SearchFilter, ]
    search_fields = ['name', 'author
 
']



# 在檢視類中
# 必須繼承GenericAPIView，才有這個類屬性
filter_backends = [SearchFilter,]
# 需要配合一個類屬性,可以按name過濾
search_fields=['name','author']

　　搜尋時候是模糊查詢

http://127.0.0.1:8000/books/?search=花
http://127.0.0.1:8000/books/?search=花  # 書名或者author中帶花就能搜到

 第三方過濾類

　　安裝

pip3 install django-filter

　　註冊

INSTALLED_APPS = [
        。。。
    
 
'django_filters',
]

　　匯入過濾類

from django_filters.rest_framework import DjangoFilterBackend

　　在檢視類中使用

from django_filters.rest_framework import DjangoFilterBackend


class BookView(GenericViewSet, ListModelMixin):
    queryset = Book.objects.all()
    serializer_class = BookSerizlizer
 
    filter_backends = [DjangoFilterBackend, ]
 
    filter_fields = ['name']



class BookView(GenericViewSet,ListModelMixin):
    # 必須繼承GenericAPIView，才有這個類屬性
    filter_backends = [DjangoFilterBackend,]
    # 需要配合一個類屬性
    filter_fields=['name','author']

　　查詢方式

http://127.0.0.1:8000/books/?name=紅樓夢
http://127.0.0.1:8000/books/?name=紅樓夢&author=小明  # and條件
http://127.0.0.1:8000/books/?author=小明

 自定義過濾

　　寫一個類，繼承BaseFilterBackend 基類，重寫filter_queryset方法,返回qs物件，是過濾後的物件

from rest_framework.filters import BaseFilterBackend


class BookFilter(BaseFilterBackend):
    def filter_queryset(self, request, queryset, view):
        query = request.query_params.get('name')
        if query:
            queryset.filter(name__contains=query)
        return queryset

　　在檢視類中使用

from .filter import BookFilter


class BookView(GenericViewSet, ListModelMixin):
    queryset = Book.objects.all()
    serializer_class = BookSerizlizer
    filter_backends = [BookFilter, ]

　　查詢方式

http://127.0.0.1:8000/books/?name=紅  # 模糊匹配 ，自己定義的