Question

我在Django中有一个数据库模型设置来跟踪投资组合，我正在尝试开发一个API来返回投资组合以及其中的每个硬币，以及与硬币相关的每个交易。但是使用api我只能看到我的模型的名称字段被返回。一些代码澄清：

model.py:

class Portfolio(models.Model):

    name = models.CharField(max_length=250)
    @property
    def coins(self):
        return Coin.objects.filter(portfolio=self)

    def transactions(self):
        return Transaction.objects.filter(portfolio=self)

    def __str__(self):
        return self.name


class Coin(models.Model):
    portfolio = models.ForeignKey(Portfolio, on_delete=models.PROTECT)
    name = models.CharField(max_length=100)
    symbol = models.CharField(max_length=5)
    price = models.DecimalField(max_digits=20, decimal_places=9)
    info = models.TextField()
    website = models.TextField()
    rank = models.IntegerField()

    def __str__(self):
        return self.name + " - " + self.symbol


class Transaction(models.Model):
    portfolio = models.ForeignKey(Portfolio, on_delete=models.CASCADE)
    coin = models.ForeignKey(Coin, on_delete=models.PROTECT)
    purchaseDate = models.DateTimeField()
    soldDate = models.DateTimeField(default=None, null=True, blank=True)
    amount = models.DecimalField(max_digits=20, decimal_places=3)
    price = models.DecimalField(max_digits=20, decimal_places=9)

    def __str__(self):
        return self.coin.name + " - " + str(self.amount) + " At $" + str(self.price)

我的json序列化器：

class PortfolioSerializer(serializers.ModelSerializer):
    class Meta:
        model = Portfolio
        fields = '__all__'

数据如何回归：

 HTTP 200 OK
    Allow: GET, POST, HEAD, OPTIONS
    Content-Type: application/json
    Vary: Accept

    [
        {
            "id": 3,
            "name": "Binance"
        }
    ]

我想要的是在数据集中，在binance下它应该显示一个硬币对象列表，其中包含每个硬币的交易列表。

Answer 1

你真的应该阅读Django-Rest-Framework docs：

class Portfolio(models.Model):

    name = models.CharField(max_length=250)
    @property
    def coins(self):
        return Coin.objects.filter(portfolio=self)

    def transactions(self):
        return Transaction.objects.filter(portfolio=self)

    def __str__(self):
        return self.name


class Coin(models.Model):
    portfolio = models.ForeignKey(Portfolio, relared_name="coins" ,on_delete=models.PROTECT)
    name = models.CharField(max_length=100)
    symbol = models.CharField(max_length=5)
    price = models.DecimalField(max_digits=20, decimal_places=9)
    info = models.TextField()
    website = models.TextField()
    rank = models.IntegerField()

    def __str__(self):
        return self.name + " - " + self.symbol

在您的PortfolioSerializer中：

class PortfolioSerializer(serializers.ModelSerializer):
    coins = CoinSerializer(many=True, read_only=True)
    class Meta:
        model = Portfolio
        fields = '__all__'

你应该在CoinSerializer的上面写一个PortfolioSerializer，例如：

class CoinSerializer(serializers.ModelSerializer):
        class Meta:
            model = Coin
            fields = '__all__'

从Django Models返回JSON中的子属性

1 个答案: