Django的REST框架：定义嵌套的对象领域？(Django REST Framework: de

我得到了发生在地点的事件：

class Event(models.Model):
    title = models.CharField(max_length=200)
    date_published = models.DateTimeField('published date',default=datetime.now, blank=True)
    date_start = models.DateTimeField('start date')
    date_end = models.DateTimeField('end date')
    def __unicode__(self):
        return self.title
    description = models.TextField()
    price = models.IntegerField(null=True, blank=True)
    tags = TaggableManager()
    location = models.ForeignKey(Location, blank=False)

class Location(models.Model):
    location_title = models.CharField(max_length=200)
    location_date_published = models.DateTimeField('published date',default=datetime.now, blank=True)
    location_latitude = models.CharField(max_length=200)
    location_longitude = models.CharField(max_length=200)
    location_address = models.CharField(max_length=200)
    location_city = models.CharField(max_length=200)
    location_zipcode = models.CharField(max_length=200)
    location_state = models.CharField(max_length=200)
    location_country = models.CharField(max_length=200)
    location_description = models.TextField()
    def __unicode__(self):
        return u'%s' % (self.location_title)

我可以得到所有通过的结果：

class EventSerializer(serializers.HyperlinkedModelSerializer):
    id = serializers.Field()
    class Meta:
        model = Event
        depth = 2
        fields = ('url','id','title','date_start','date_end','description', 'price', 'location')

其输出：

 {
            "url": "http://localhost:8000/api/event/3/", 
            "id": 3, 
            "title": "Testing", 
            "date_start": "2013-03-10T20:19:00Z", 
            "date_end": "2013-03-10T20:19:00Z", 
            "description": "fgdgdfg", 
            "price": 10, 
            "location": {
                "id": 2, 
                "location_title": "Mighty", 
                "location_date_published": "2013-03-10T20:16:00Z", 
                "location_latitude": "37.767475", 
                "location_longitude": "-122.406878", 
                "location_address": "119 Utah St, San Francisco, CA 94103, USA", 
                "location_city": "San Francisco", 
                "location_zipcode": "94103", 
                "location_state": "California", 
                "location_country": "United States", 
                "location_description": "Some place"
            }
        }, 

不过，我不希望它抓住所有领域，因为我并不需要所有的人。 我怎样才能界定哪些领域应该从我的嵌套的对象进行检索？ 谢谢！

Answer 1:

串行器可以被嵌套，所以做这样的事情...

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

class EventSerializer(serializers.HyperlinkedModelSerializer):
    id = serializers.Field()
    location = LocationSerializer()

    class Meta:
        model = Event
        fields = ('url','id','title','date_start','date_end','description', 'price', 'location')

Answer 2:

我到过这一点，并没有得到一个完美的解决方案，但我做了一件你可以检查它。

这种方法不会创建嵌套序列化

**class LocationSerializer(serializers.ModelSerializer):**
     class Meta:
          model = Location
          fields = (...)       #does not matter
          exclude = (...)      #does not matter

class EventSerializer(serializers.ModelSerializer):**
    loc_field_1 = serializers.CharField(required=False,*source='location.loc_field_1'*)
    loc_field_2 = serializers.CharField(required=False,*source='location.loc_field_2'*)

    ***#ADD YOUR DESIRE FIELD YOU WANT TO ACCESS FROM OTHER SERIALIZERS***


    class Meta:
        model = Event
        fields =('url','id','title','date_start','date_end','description', 'price', 'location')

Answer 3:

我发现当我试图找出如何从只在被嵌套它串行排除某些领域这个问题。 看起来Tasawer纳瓦兹有这样的问题也是如此。 您可以通过重写做get_field_names 。 下面是根据汤姆·克里斯蒂回答一个例子：

class LocationSerializer(serializers.ModelSerializer):
    class Meta:
        model = Location
        fields = (...)
        exclude_when_nested = {'location_title', 'location_date_published'}  # not an official DRF meta attribute ...

    def get_field_names(self, *args, **kwargs):
        field_names = super(LinkUserSerializer, self).get_field_names(*args, **kwargs)
        if self.parent:
            field_names = [i for i in field_names if i not in self.Meta.exclude_when_nested]
        return field_names

class EventSerializer(serializers.HyperlinkedModelSerializer):
    id = serializers.Field()
    location = LocationSerializer()

    class Meta:
        model = Event
        fields = ('url','id','title','date_start','date_end','description', 'price', 'location')

文章来源: Django REST Framework: define fields in nested object?