django rest framework 外键序列化方法与问题总结

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为前端提供数据时，往往是这样的json

{    'album_name': 'Undun',    'artist': 'The Roots',    'tracks': 01}......

如果需要外键字段对应表的详细信息，像这样

{    'album_name': 'The Grey Album',    'artist': 'Danger Mouse',    'tracks': [        {'order': 1, 'title': 'Public Service Announcement', 'duration': 245},        {'order': 2, 'title': 'What More Can I Say', 'duration': 264},        {'order': 3, 'title': 'Encore', 'duration': 159},        ...    ],}

要怎么配置？

查看 django rest framework 官网说明http://www.django-rest-framework.org/api-guide/relations/  

虽然讲到了怎么操作，但是不详细，屡屡遇坑

所用到的model

class Album(models.Model):    album_name = models.CharField(max_length=100)    artist = models.CharField(max_length=100)class Track(models.Model):    album = models.ForeignKey(Album,   on_delete=models.CASCADE)    order = models.IntegerField()    title = models.CharField(max_length=100)    duration = models.IntegerField()    class Meta:        unique_together = ('album', 'order')        ordering = ['order']    def __unicode__(self):        return '%d: %s' % (self.order, self.title)

配置serializer

class TrackSerializer(serializers.ModelSerializer):    class Meta:        model = Track        fields = ('order', 'title', 'duration')class AlbumSerializer(serializers.ModelSerializer):    tracks = TrackSerializer(many=True, read_only=True)    class Meta:        model = Album        fields = ('album_name', 'artist', 'tracks')

好像搞定了，运行起来才发现有个坑

Got AttributeError when attempting to get a value for field 'tracks' on serializer 'AlbumSerializer'

没有tracks字段，咋整？

原来只要在model foreignkey里面添加
 related_name='tracks',
 album = models.ForeignKey(Album,  related_name='tracks', on_delete=models.CASCADE)
就搞定了。。
官网例子里有，但是很容易忽略，这里提出来，希望大家注意

为前端提供数据时，往往是这样的json
{    'album_name': 'Undun',    'artist': 'The Roots',    'tracks': 01}......

如果需要外键字段对应表的详细信息，像这样
{    'album_name': 'The Grey Album',    'artist': 'Danger Mouse',    'tracks': [        {'order': 1, 'title': 'Public Service Announcement', 'duration': 245},        {'order': 2, 'title': 'What More Can I Say', 'duration': 264},        {'order': 3, 'title': 'Encore', 'duration': 159},        ...    ],}
要怎么配置？
查看 django rest framework 官网说明http://www.django-rest-framework.org/api-guide/relations/  
虽然讲到了怎么操作，但是不详细，屡屡遇坑
所用到的model
class Album(models.Model):    album_name = models.CharField(max_length=100)    artist = models.CharField(max_length=100)class Track(models.Model):    album = models.ForeignKey(Album,   on_delete=models.CASCADE)    order = models.IntegerField()    title = models.CharField(max_length=100)    duration = models.IntegerField()    class Meta:        unique_together = ('album', 'order')        ordering = ['order']    def __unicode__(self):        return '%d: %s' % (self.order, self.title)
配置serializer

class TrackSerializer(serializers.ModelSerializer):    class Meta:        model = Track        fields = ('order', 'title', 'duration')class AlbumSerializer(serializers.ModelSerializer):    tracks = TrackSerializer(many=True, read_only=True)    class Meta:        model = Album        fields = ('album_name', 'artist', 'tracks')
好像搞定了，运行起来才发现有个坑
Got AttributeError when attempting to get a value for field 'tracks' on serializer 'AlbumSerializer'
没有tracks字段，咋整？
原来只要在model foreignkey里面添加
 related_name='tracks',
 album = models.ForeignKey(Album,  related_name='tracks', on_delete=models.CASCADE)
就搞定了。。
官网例子里有，但是很容易忽略，这里提出来，希望大家注意