如何使用此模型结构在 django rest 框架中创建 POST 请求

Question

我是 django 和 django rest 框架的新手，我正在尝试使用 POST 请求发送一个对象，但我不知道它为什么会失败，这些是我的模型：

class Region(models.Model):
id_region = models.AutoField(primary_key=True)
name_region = models.CharField(max_length=255) 

def __str__(self):
    return self.name_region


class DataTicker(models.Model):
id_data_ticker = models.AutoField(primary_key=True)
ytd = models.FloatField()
expense_ratio = models.FloatField()
price_earnings_ratio = models.FloatField()
price_book_ratio = models.FloatField()
aum_ticker = models.FloatField()
price = models.FloatField()
nav = models.FloatField()
bid_ask = models.FloatField()
premiun_discount = models.FloatField()
date= models.DateTimeField(auto_now=False)
region_id_fk = models.ForeignKey(Region,on_delete=models.CASCADE)
geography_id_fk = models.ForeignKey(Geography,on_delete=models.CASCADE)

def __str__(self):
    return str(self.id_data_ticker)


class Ticker(models.Model):
id_number = models.AutoField(primary_key=True)
ticker_id = models.CharField(max_length=100)
index_tracked = models.CharField(max_length=255)
fund = models.CharField(max_length=255)
focus = models.CharField(max_length=255)
inception_date= models.DateTimeField(auto_now=False)
asset_id_fk = models.ForeignKey(AssetClass,on_delete=models.CASCADE)
data_tickers = models.ManyToManyField(DataTicker)

def __str__(self):
    return self.ticker_id

这是我的序列化器

class RegionSerializer(serializers.HyperlinkedModelSerializer):
class Meta:
    model = Region
    fields = ('id_region','name_region','geography_id_fk')

class DataTickerSerializer(serializers.HyperlinkedModelSerializer):
class Meta:
    model = DataTicker
    fields = ('id_data_ticker','ytd','expense_ratio','price_earnings_ratio',
    'price_book_ratio','aum_ticker','price','nav','bid_ask','premiun_discount','date','region_id_fk','geography_id_fk')

region_id_fk =  serializers.SerializerMethodField('get_region_id_fk')
geography_id_fk =  serializers.SerializerMethodField('get_geography_id_fk')

def get_region_id_fk(self,obj):
    return obj.region_id_fk.name_region

def get_geography_id_fk(self,obj):
    return obj.geography_id_fk.name_geography

class TickerSerializer(serializers.ModelSerializer): 
#data_tickers = serializers.PrimaryKeyRelatedField(queryset=DataTicker.objects.all(), many=True)
data_tickers = DataTickerSerializer(many=True, read_only=True)

class Meta:
    model = Ticker
    fields = ('id_number','ticker_id','index_tracked','fund',
    'focus','inception_date',
    'asset_id_fk','data_tickers')

asset_id_fk =  serializers.SerializerMethodField('get_asset_id_fk') 

def get_asset_id_fk(self,obj):
    return obj.asset_id_fk.name_asset

我的观点：

class RegionSViewSet(viewsets.ModelViewSet):
queryset = Region.objects.all().order_by('id_region')
serializer_class = RegionSerializer


class TickerViewSet(viewsets.ModelViewSet):
queryset = Ticker.objects.all().order_by('id_number')
serializer_class = TickerSerializer

class DataTicketViewSet(viewsets.ModelViewSet):
queryset = DataTicker.objects.all().order_by('id_data_ticker')
serializer_class = DataTickerSerializer

这是我要发送的对象：

var obj = { "ticker_id": "测试", "index_tracked": "测试", “基金”：“测试”， “焦点”：“测试”， "inception_date": "2019-11-19T19:28:16Z", “asset_id_fk”：6， “data_tickers”：[{ “id_data_ticker”：1， “年初至今”：0.126504， “费用比率”：25.0， “price_earnings_ratio”：20.257181， “price_book_ratio”：2.345986， “aum_ticker”：25290400.0， “价格”：10000.0， “导航”：11000.0， "bid_ask": 15000.0, “premiun_discount”：2000.0， “日期”：“2019-11-01T19:23:03Z”， "region_id_fk": "欧洲", "geography_id_fk": "发达的欧洲" }] }

我做错了什么？ 谢谢！

Answer 1

在您的视图中，您必须添加一个方法调用帖子 见例子https://www.django-rest-framework.org/tutorial/3-class-based-views/

class TickerList(APIView):

    def post(self, request, format=None):
        serializer = TickerSerializer(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)```