反向關係ToManyField Tastypie

Question

我有兩個資源（Tastypie），其中一個有ToManyField場：

class SongResource(ModelResource): 

    class Meta: 
     queryset = Song.objects.all() 
     resource_name = 'song' 
     authorization = Authorization() 



class AlbumResource(ModelResource): 
    songs = fields.ToManyField('core.api.SongResource', 'songs', full=True) 
    class Meta: 
     queryset = Album.objects.all() 
     resource_name = 'album' 
     authorization = Authorization() 

所以，當我進入我的PlaylistResource我看到這樣的事情：

http://127.0.0.1:8000/api/v1/playlist/1/?format=json這裏是響應我得到：

{ 
"created_in": "2012-06-24T22:57:01+00:00", 
"id": "1", 
"number_of_plays": 0, 
"playlist_slug": "my-first-playlist", 
"playlist_title": "my first playlist", 
"resource_uri": "/api/v1/playlist/1/", 
"songs": [{ 
    "genre": "Progressive metal", 
    "id": "2", 
    "length": "04:19", 
    "number_of_plays": 0, 
    "price": 0.0, 
    "resource_uri": "/api/v1/song/2/", 
    "song_slug": "leyla-2008", 
    "song_title": "Leyla", 
    "song_url": "http://www.amazon.s3.com/prologue", 
    "thumbnail": "http://almacosta.files.wordpress.com/2011/05/bob_marley.jpg?w=250", 
    "year": 2008 
}, { 
    "genre": "Progressive metal", 
    "id": "3", 
    "length": "3.26", 
    "number_of_plays": 0, 
    "price": 0.0, 
    "resource_uri": "/api/v1/song/3/", 
    "song_slug": "yazamadim-2008", 
    "song_title": "Yazamadim", 
    "song_url": "http://www.amazon.s3.com/prologue", 
    "thumbnail": "http://img72.imageshack.us/img72/3215/14so8.jpg", 
    "year": 2008 
}] 

}

現在我要訪問的每首歌曲的專輯或藝術家，所以我加了

album = fields.ForeignKey('core.api.AlbumResource','album') 

我SongResource，但我得到這個錯誤

{ 
"error_message": "'Song' object has no attribute 'album'", 
"traceback": "Traceback (most recent call last):\n\n File \"/usr/local/lib/python2.7/dist-packages/tastypie/resources.py\", line 192, in wrapper\n response = callback(request, *args, **kwargs)\n\n File \"/usr/local/lib/python2.7/dist-packages/tastypie/resources.py\", line 406, in dispatch_detail\n return self.dispatch('detail', request, **kwargs)\n\n File \"/usr/local/lib/python2.7/dist-packages/tastypie/resources.py\", line 427, in dispatch\n response = method(request, **kwargs)\n\n File \"/usr/local/lib/python2.7/dist-packages/tastypie/resources.py\", line 1058, in get_detail\n bundle = self.full_dehydrate(bundle)\n\n File \"/usr/local/lib/python2.7/dist-packages/tastypie/resources.py\", line 654, in full_dehydrate\n bundle.data[field_name] = field_object.dehydrate(bundle)\n\n File \"/usr/local/lib/python2.7/dist-packages/tastypie/fields.py\", line 709, in dehydrate\n m2m_dehydrated.append(self.dehydrate_related(m2m_bundle, m2m_resource))\n\n File \"/usr/local/lib/python2.7/dist-packages/tastypie/fields.py\", line 514, in dehydrate_related\n return related_resource.full_dehydrate(bundle)\n\n File \"/usr/local/lib/python2.7/dist-packages/tastypie/resources.py\", line 654, in full_dehydrate\n bundle.data[field_name] = field_object.dehydrate(bundle)\n\n File \"/usr/local/lib/python2.7/dist-packages/tastypie/fields.py\", line 621, in dehydrate\n foreign_obj = getattr(bundle.obj, self.attribute)\n\nAttributeError: 'Song' object has no attribute 'album'\n" 

}

是否有允許任何伎倆我得到反向數據？

編輯 這裏是我的歌曲和專輯模式（順序相同，因爲我在models.py文件）

class Song(models.Model): 

    song_title = models.CharField(max_length=140) 
    length = models.CharField(max_length=5, blank=True, null = True) 
    genre = models.CharField(max_length=100, blank = True, null = True) 
    year = models.IntegerField(blank = True, null = True) 
    thumbnail = models.URLField(default = '/media/thumbnail.png') 
    song_url = models.URLField() 
    number_of_plays = models.IntegerField(verbose_name='Number of plays') 
    price = models.FloatField(default = 0.0) 
    song_slug = models.SlugField(unique=True, max_length=200) 

    def __unicode__(self): 
     return self.song_title 

class Album(models.Model): 

    album_title = models.CharField(max_length=140) 
    release_year = models.IntegerField('Release Year') 
    price = models.FloatField(default=0.0) 
    album_slug = models.SlugField(unique=True) 
    songs = models.ManyToManyField(Song) 

    def __unicode__(self): 
     return self.album_title 

    def get_absolute_url(self): 
     return '/album/%s' % self.album_slug 

Answer 1

使用ToManyField，而不是ForeignKey的，並告訴它的屬性是album_set。要獲得全部資源，請指定full=True。