如何在返回的JSON中不显示外键ID？

class MySerializer(serializers.ModelSerializer):
    foreign_key_field = serializers.SerializerMethodField()

    def get_foreign_key_field(self, obj):
        return obj.foreign_key_field.value

    class Meta:
        model = MyModel
        fields = ('id', 'foreign_key_field', 'other_field')

result = MyModel.objects.exclude(foreign_key_field__isnull=False).values('id', 'other_field')

class MyModel(models.Model):
    foreign_key_field = models.ForeignKey(ForeignKeyModel, on_delete=models.CASCADE)

    @property
    def foreign_key_field_value(self):
        return self.foreign_key_field.value

class MySerializer(serializers.ModelSerializer):
    foreign_key_field = serializers.CharField(source='foreign_key_field_value')

    class Meta:
        model = MyModel
        fields = ('id', 'foreign_key_field', 'other_field')