相关疑难解决方法(0)

我有一个关于处理m2m /通过模型及其在django rest框架中的表示的问题.我们来看一个经典的例子:

models.py:

from django.db import models

class Member(models.Model):
    name = models.CharField(max_length = 20)
    groups = models.ManyToManyField('Group', through = 'Membership')

class Group(models.Model):
    name = models.CharField(max_length = 20)

class Membership(models.Model):
    member = models.ForeignKey('Member')
    group = models.ForeignKey('Group')
    join_date = models.DateTimeField()

serializers.py:

imports...

class MemberSerializer(ModelSerializer):
    class Meta:
        model = Member

class GroupSerializer(ModelSerializer):
    class Meta:
        model = Group

views.py:

imports...

class MemberViewSet(ModelViewSet):
    queryset = Member.objects.all()
    serializer_class = MemberSerializer

class GroupViewSet(ModelViewSet):
    queryset = Group.objects.all()
    serializer_class = GroupSerializer

在获取成员实例时,我成功接收了所有成员的字段及其组 - 但是我只获得了组的详细信息,而没有来自成员模型的额外详细信息.

换句话说,我希望收到:

{ …

基本上我有这样的模型:

class Playlist(models.Model):
    key = models.CharField(max_length=255,blank=True, unique=True)
    user = models.ForeignKey(User)
    title = models.CharField(max_length=200)
    pub_date = models.DateTimeField(auto_now_add=True)
    videos = models.ManyToManyField(Video, through='PlaylistVideo')

class PlaylistVideo(models.Model):
    playlist = models.ForeignKey(Playlist)
    video =    models.ForeignKey(Video)
    position = models.IntegerField()

class Video(models.Model):
    title = models.CharField(max_length=255,blank=True)
    description = models.TextField(blank=True)
    thumb =  models.URLField(blank=True)
    duration = models.IntegerField(default=0)

现在我想要一个API来返回这样的PLAYLISTS ...但是视频应该按PlaylistVideo模型中的POSITION排序

{
        "key": "h8x3",
        "title": "First Playlist",
        "pub_date": "2012-10-11T17:00:26Z",
        "videos": [
            {
                ....
            },
            {
                ....
            }
        ]
    },

我该怎么办呢？

我有一个Recipe模型,它包含一个IngredientType对象的M2M字段.这个字段,也就是ingredient_list,通过一个Ingredient对象使用臭名昭着的"通过"模型,该对象将额外的数据添加到我的IngredientType中.这些是我的课程:

class Recipe(models.Model):
    user_profile = models.ForeignKey(UserProfile, null=True, blank = True)
    name = models.CharField(max_length=200)
    photo1 = models.ImageField( upload_to = 'images/recipies', help_text="This photo will show by default")
    ingredient_list = models.ManyToManyField(IngredientType,through='Ingredient')

class Ingredient(models.Model):
    ingredient_type = models.ForeignKey(IngredientType)
    recipe = models.ForeignKey(Recipe)
    amount = models.IntegerField()
    units = models.CharField(max_length=4,choices=UNIT, 
                               default=None, null=True, blank = True)

class IngredientType(models.Model):
    name = models.CharField(max_length=200)
    plural_name = models.CharField(max_length=200)
    photo = models.ImageField( upload_to = 'images/ingredients')
    is_main = models.BooleanField()

我尝试使用rest_framework序列化它们:

class IngredientTypeSerializer(serializers.HyperlinkedModelSerializer):
    class Meta:
        model = IngredientType
        fields=('name', 'plural_name', 'photo', 'is_main')

class IngredientSerializer(serializers.HyperlinkedModelSerializer):
    ingredient_type = …