Drf之单条数据的增删改查以及校验（五）

单条数据的增删改查

 # 前提：
# 1）序列化类中不能修改原字段的深度
# 2）通过 data=请求数据包 得到可以操作orm的序列化对象，instance来明确修改的对象，校验成功后还是走save()来更新
# 3）必须先校验，才能保存或更新

# 增
class Books(APIView):
    """
    {
        "name":"水浒传",
        "price":"88.88",
        "author":[1, 2, 3 ]
    }
    """
    def post(self, request):
        book_dic = request.data
        book_json = objson.BookJson(data=book_dic)
       	# 数据的校验
        if book_json.is_valid():
            book_json.save()  # 不涉及跨表操作
        return Response({
            'status': 0,
            'msg': 'ok',
            'results': book_json.data
        })
# 查改删
class Book(APIView):
    def get(self, request, id):
        book_obj = models.Book.objects.filter(pk=id).first()
        book_data = objson.BookJson(book_obj).data
        return Response({
            'status': 0,
            'msg': 'ok',
            'results': book_data
        })
    def put(self, request, id):
        book_obj = models.Book.objects.filter(pk=id).first()
        # instance来明确修改的对象，校验成功后还是走save()来保存
        book_json = objson.BookJson(data=request.data, instance=book_obj)
        if book_json.is_valid():
            book_json.save()
        return Response({
            'status': 0,
            'msg': 'ok',
            'results': book_json.data
        })
    def delete(self, request, id):
        models.Book.objects.filter(pk=id).delete()
        return Response({
            'status': 2,
            'msg': 'delete success',
        })

数据的校验

# views.py
class Books(APIView):
    def post(self, request):
        book_dic = request.data
        book_json = objson.BookJson(data=book_dic)
       	# 数据的校验
        if book_json.is_valid():
            # book_json.save()  # 不涉及跨表操作
            return Response({
                'status': 0,
                'msg': 'ok',
                'results': book_json.data
            })
        return Response({
            'status': 0,
            'msg': book_json.errors,
        })

    
# objson.py
class BookJson(serializers.ModelSerializer):
    class Meta:
        model = models.Book
        fields = '__all__'

    # 认证
    name = serializers.CharField(
        max_length=5,
        min_length=1,
        error_messages={
            "max_length": "太长了",
            "min_length": "太短了",
        }
    )

    # 局部钩子（validate_要校验的字段名）
    def validate_name(self, value):
        from rest_framework.exceptions import ValidationError
        if 'sb' in value:
            raise ValidationError("出现了敏感词汇")
        return value


    # def validate_price(self, value):
    #     from rest_framework.exceptions import ValidationError
    #     if float(value) < 0:
    #         raise ValidationError("价格不合理")
    #     return
    
    
    
# 了解：如果多个字段直接协同校验，采用全局钩子
def validate(self, attrs):
    from rest_framework.exceptions import ValidationError
    pwd = attrs.get('pwd')
    re_pwd = attrs.get('re_pwd')
    if pwd == re_pwd:
        return attrs
    else:
        raise ValidationError('密码校验失败')