Question

仅作为序言，我是初学者，我意识到我的约定可能不完全是标准的，所以如果你能纠正我做错的话，我将不胜感激。

目前，我的API使用以下方式调用：

http:127.0.0.1:8000/weather/<latitude>,<longitude>

我从某些API中提取天气数据，但也希望同时将其存储在数据库中。为了表示天气，我有两个模型，位置和当前，它们包含坐标和天气信息。在这种情况下，父级是位置。

我的问题是我不知道如何将 Location 外键传递给 CurrentlySerializer 。在下面的代码中，我根本没有传递它，我收到了明显的＆＃34;位置字段是必需的＆＃34;错误。

views.py

def get(self, request, *args, **kwargs):
    # Process latitude and longitude coordinates from URL
    coordinates = kwargs.pop('location', None).split(",")
    latitude = coordinates[0]
    longitude = coordinates[1]

    # Retrieve weather data.
    forecast = get_weather(latitude, longitude)
    currently = forecast['currently']

    # Serialize and confirm validity of data.
    location_serializer = LocationSerializer(data=forecast)
    if not location_serializer.is_valid():
        return Response(location_serializer.errors,
                        status=status.HTTP_400_BAD_REQUEST)

    currently_serializer = CurrentlySerializer(data=currently)
    if not currently_serializer.is_valid():
        return Response(currently_serializer.errors,
                        status=status.HTTP_400_BAD_REQUEST)

    response = location_serializer.data + currently_serializer.data
    return Response(response, status=status.HTTP_200_OK)

models.py

class Location(models.Model):
    ... some fields


class DataPoint(models.Model):
    ... some fields
    class Meta:
        abstract = True


class Currently(DataPoint):
    location = models.ForeignKey(Location, on_delete=models.CASCADE)

serializers.py

class LocationSerializer(serializers.ModelSerializer):
    class Meta:
        model = Location
        fields = '__all__'


class CurrentlySerializer(serializers.ModelSerializer):
    class Meta:
        model = Currently
        fields = '__all__'

services.py

def get_weather(latitude, longitude):
    response = requests.get('https://api.darksky.net/forecast/' +
                        settings.WEATHER_API_KEY + '/' +
                        latitude + ',' +
                        longitude + '/')
    return response.json()

Answer 1

您需要检索要附加到Location的{{1}}实例，并将currently主键分配给数据。

Locations

如何在同时创建父项时将外键传递给序列化程序？

1 个答案: