Django Rest Framework - 如何在 ModelSerializers 的相关字段中获取 __unicode__() 值

Question

ModelSerializer() 出于某种原因不会显示相关模型的 __unicode__() 值，而是显示它们的 id - 有没有办法解决这个问题？或者我必须以某种方式明确定义所有相关字段？对于相关模型，我使用利用 HyperlinkedModelSerializer 的 ModelView。

型号

class ActionItem(CoreBase):
    project = models.ForeignKey(Project, null=True, blank=True, related_name='ProjectActionItems')
    portfolio = models.ForeignKey(Portfolio, null=True, blank=True, related_name='PortfolioActionItems')
    name = models.CharField(max_length=256, null=False)
    description = models.TextField(null=True, blank=True)
    parent = models.ForeignKey('ActionItem', null=True, blank=True)
    priority = models.ForeignKey(DicPriority, default=ActionItem_default_priority)
    status = models.ForeignKey(DicActionItemStatus, default=ActionItem_initial_status)
    resolution = models.TextField(null=True, blank=True)
    assignee = models.ForeignKey(User, null=True, blank=True, related_name='executor')
    due_date = models.DateField(null=True, blank=True)

相关模型（优先级）：

class DicPriority(DicCoreBase):
    name = models.CharField(max_length=64, unique=True, blank=False, null=False)

    class Meta:
        verbose_name = '[D] Priority'
        verbose_name_plural = '[D] Priorities'

它的基类：

class DicCoreBase(CoreBase):
    order = models.PositiveSmallIntegerField(default=10, null=False, blank=False)

    class Meta:
        abstract = True
        ordering = ['order']

    def __unicode__(self):
        if hasattr(self, 'name'):
            return self.name
        else:
            return u'Dic (%s): %s' % (self.__class__.__name__, self.pk)

序列化器

class ActionItemTextSerializer(serializers.ModelSerializer):

    class Meta:
        model = ActionItem
        fields = ('id', 'created_by', 'created_date', 'project', 'portfolio', 'name', 'description', 'parent', 'priority', 'status')


class ActionItemViewSet(viewsets.ModelViewSet):
    queryset = ActionItem.objects.all()
    serializer_class = ActionItemTextSerializer

输出：

{
        "id": 5,
        "created_by": 1,
        "created_date": "2015-03-19T18:34:07Z",
        "project": 1,
        "portfolio": null,
        "name": "NEW TEST!!!",
        "description": "ACE TEST NEW XOXO",
        "parent": null,
        "priority": 2,
        "status": 2
    }

Answer 1

DRF 为相关字段提供 Keys，以便在相关对象之间轻松导航。如果要引用相关字段的属性，可以显式定义：

class ActionItemTextSerializer(serializers.ModelSerializer):

    priority_text = serializers.CharField(source='priority')
    class Meta:
        model = ActionItem
        fields = ('id', 'created_by', 'created_date', 'project', 'portfolio', 'name', 'description', 'parent', 'priority_text', 'status')

编辑： 我最初有source='priority__name'，但凯文指出我使用的语法不正确，应该是source='priority.name'，但后来我重新阅读了这个问题，它专门针对__unicode__，所以这只是定义的问题您的序列化器字段作为 CharField，它将自动在您的对象上调用 __unicode__。所以我们最终得到source='priority'