python - django 多对多通过

Question

我正在尝试实现一个教练系统，但我对 django 中的序列化有点迷茫。我有一个多对多的直通模型来控制约会，我想获得有关参与的教练/教练的所有数据关系。

class Appointment(models.Model):
    """docstring for Appointment"""
    coach = models.ForeignKey(User, related_name='coaches', on_delete=models.CASCADE)
    coachee = models.ForeignKey(User, related_name='coachees', on_delete=models.CASCADE)
    schedule_date = models.DateField(auto_now=False, auto_now_add=True, blank=True)
    due_date = models.DateField()
    summary = models.TextField(max_length=200)

使用以下序列化器我可以获得涉及的主键，但我真的很想在一个请求中获得教练和教练的详细信息。

#return appointment data
class AppointmentSerializer(serializers.HyperlinkedModelSerializer):
    """docstring for AppointmentSerializer"""
    class Meta:
        model = Appointment
        fields = ('id', 'schedule_date', 'due_date', 'coach', 'coachee', 'summary', 'condition')

Answer 1

尝试在 Meta 类上设置 depth 选项。

class AppointmentSerializer(serializers.HyperlinkedModelSerializer):
    """docstring for AppointmentSerializer"""
    class Meta:
        model = Appointment
        fields = ('id', 'schedule_date', 'due_date', 'coach', 'coachee', 'summary', 'condition')
        depth = 1

这将生成嵌套表示。

或者，如果您需要更多控制，您可以显式指定序列化器。

class AppointmentSerializer(serializers.HyperlinkedModelSerializer):
    coach = CoachSerializer()
    coachee = CoacheeSerializer()

    class Meta:
        model = Appointment
        fields = ('id', 'schedule_date', 'due_date', 'coach', 'coachee', 'summary', 'condition')

您还可以从相关模型中添加单个字段:

class AppointmentSerializer(serializers.HyperlinkedModelSerializer):
    """docstring for AppointmentSerializer"""
    coach_name = serializers.CharField(source='coach.name')

    class Meta:
        model = Appointment
        fields = ('id', 'schedule_date', 'due_date', 'coach', 'coachee', 'summary', 'condition')