django rest frame work 初步使用 >> 序列化

>> 按照官網建立prject + app

 

Part 1. 序列化：

（把數據庫數據轉化成特定格式json, 我的理解）

採用原生的序列化方法：

def publisher_list(request): queryset = Publisher.objects.all() data = [] # [方法一] user self to convert
    for i in queryset: p_tmp = { 'name': i.name, 'address': i.address } data.append(p_tmp) # [方法二] use django form, 可是不少 
    from django.froms.models import model_to_dict for i in queryset: data.append(model_to_dict(i)) import json return HttpResponse(json.dumps(data), content_type="application/json") # [方法三] use django 自帶的序列化
    from django.core import serializers data = serializers.serialize("json", queryset) return HttpResponse(data, content_type="application.json")

django 原生序列化

 

採用django-rest-framework 序列化：

# create file "serializers" in <app>

from rest_framework import serializers from helloworld.models import Publisher class PublisherSerializer(serializers.Serializer): # 類名：表名＋"Serializer"
    id = serializers.IntegerField(read_only=True) name = serializers.CharField(max_length=32) address = serializers.CharField(max_length=128) def create(self, validated_data): ## 從新定義 create
        # validated_data is dict
        return Publisher.objects.create(**validated_data) def update(self, instance, validated_data): ## 從新定義 update
        instance.name = validated_data.get("name", instance.name) instance.address = validated_data.get("address", instance.address) instance.save() return instance

rest_framework

from rest_framework import serializers from helloworld.models import Publisher # class PublisherSerializer(serializers.Serializer): # id = serializers.IntegerField(read_only=True) # name = serializers.CharField(max_length=32) # address = serializers.CharField(max_length=128) # # def create(self, validated_data): # # validated_data is dict # return Publisher.objects.create(**validated_data) # # def update(self, instance, validated_data): # instance.name = validated_data.get("name", instance.name) # instance.address = validated_data.get("address", instance.address) # instance.save() # return instance


class PublisherSerializer(serializers.ModelSerializer): class Meta: model = Publisher fields = ( "id", "name", "address" )

ModelSerializer

 

使用方法：

# 從 DB >> json
from <app>.models import Publisher form <app>.serializers import PublisherSerializer p1 = Publiser.objects.first() s1 = PublisherSerializer(p1) s1.data # Out[6]: {'id': 1, 'name': 'AAA', 'address': '3-103'}


#-------------------------------------- # 從json >> DB (create) 
from <app>.models import Publisher form <app>.serializers import PublisherSerializer p2 = {'name': 'ZZZ', 'address': '18-103'} s2 = PublisherSerializer(data=p2) # s2.is_valid()
Out[4]: True # s2.validated_data
Out[5]: OrderedDict([('name', 'ZZZ'), ('address', '18-103')]) # s2.save()
Out[6]: <Publisher: ZZZ>

rest 序列化使用方法

def publisher_list(request): queryset = Publisher.objects.all() from helloworld.serializers import PublisherSerializer s = PublisherSerializer(queryset, many=True) # s.data >> 大列表， 用戶返回。

    import json return HttpResponse(json.dumps(s.data), content_type="application/json")

views 使用rest 序列化