如何序列化具有多个外键的模型？

Question

我想以下面给出的格式序列化数据。我是 django-rest 框架的新手。我在一个大学项目中工作。所以，我们将不胜感激。

    {
      {
      "Series_name":"something",
      "Home_team":"anything",
      "Away_team":"sbh",
       "players":[
                {
                   "id":"1",
                    ...
                }
                {
                    "id":"2",
                    ...
                }
        ]

      },

      {
      "Series_name":"something2",
      "Home_team":"anything",
      "Away_team":"sbh",
       "players":[
                {
                   "id":"1",
                    ...
                }
                {
                    "id":"1",
                    ...
                }
        ]

       }

    }

我试过这个。但这并没有给出令人满意的结果。实际上它返回空集。

    class PlayersSerializer2(serializers.ModelSerializer):

        class Meta:
            model = Players
            fields = ['name', 'country', 'image', 'role', 'credit']

    class SeriesListSerializer2(serializers.ModelSerializer):

        class Meta:
            model = SeriesList
            fields = '__all__'


    class SeriesSquadsSerializer(serializers.ModelSerializer):
        players = PlayersSerializer2(many=True, read_only=True)
        series = SeriesListSerializer2(many=True, read_only=True)

        class Meta:
            model = SeriesSquads
            fields = ['series', 'players']

这些是我正在使用的模型。我有 3 个模型 SeriesList、Series_Squads 和 Players。Series_sqauds 有唯一的对（Series_name、Players）。它有两个外键指向 SeriesList 和 Players 对象。

    class SeriesList(models.Model):
        Series_name = models.CharField(max_length=250, 
                   unique=True,primary_key=True)
        No_of_matches = models.IntegerField()
        Home_team = models.CharField(max_length=250)
        Away_team = models.CharField(max_length=250)


    class SeriesSquads(models.Model):
        Series_name = models.ForeignKey(SeriesList, on_delete=models.CASCADE)
        Squad_player = models.ForeignKey(Players, on_delete=models.CASCADE)

    class Players(models.Model):
        name = models.CharField(default="", max_length=250)
        country = models.CharField(max_length=250)
        image = models.CharField(max_length=500)
        role = models.CharField(max_length=30)
        credit = models.FloatField(default=None)

Answer 1

您可以让SerializerMethodField 的用户将您的 ForeignKey 相关对象放入您的序列化程序中。更新您的序列化程序，以便：

class PlayersSerializer2(serializers.ModelSerializer):

    class Meta:
        model = Players
        fields = ['name', 'country', 'image', 'role', 'credit']


class SeriesSquadsSerializer(serializers.ModelSerializer):
    players = PlayersSerializer2(many=True, read_only=True)
    Series_name = serializers.SerializerMethodField()
    Home_team = serializers.SerializerMethodField()
    Away_team =  = serializers.SerializerMethodField()

    class Meta:
        model = SeriesSquads
        fields = ['players']

    def get_Series_name(self, obj):
        return obj.Series_name.Series_name

    def get_Home_team(self, obj):
        return obj.Series_name.Home_team

    def get_Away_team(self, obj):
        return obj.Series_name.Away_team