django-rest-framework中可写的嵌套序列化程序？(Writable nested serializer in django-rest-framework?)

 我的设计如下关于Django ModelSerializer。 有模型A和模型B.模型B有模型A的外键字段。由于某些原因，我不能直接使用主键来序列化模型B.我的想法，我需要的是序列化其他两个字段（在A型中独一无二。 
 
 我看到SlugRelatedField必须用于一个slug字段。 我搜索了一个NaturalKeyField可以支持NaturalKeyField。 但看起来它被django-rest-framework所取代。 但我检查了django-rest-framework，根本就没有这样的字段。 谁能帮忙？ 我该怎么办？ 
 
 代码如下。 模型A. 
 
class AssetModel(models.Model):
    org = models.ForeignKey(Org, related_name='models')
    name = models.CharField(max_length=128)
    model_type = models.SmallIntegerField(default = 3,choices = MODEL_TYPE )
    directory = models.CharField(max_length = 128)
    ...
    class Meta:
        unique_together = ('org', 'name',)
 
 模型B. 
 
class Dataitem(models.Model):
    mod = models.ForeignKey(AssetModel, related_name='dataitems')
    name = models.CharField(max_length=128)
    data_type = models.SmallIntegerField(default =0,choices = DATAITEM_DATATYPE)
    ...
 
 A型串行器 
 
class AssetModelSerializer(serializers.ModelSerializer):
    org =  serializers.SlugRelatedField(queryset=Org.objects.all(), slug_field='name')
    class Meta:
        model = AssetModel
        fields = ('org', 'name', 'model_type',..
 
 B型串行器 
 
class DataitemSerializer(serializers.ModelSerializer):
    class Meta:
        model = Dataitem
        fields = ('mod', 'name','data_type'...)
 
 模型A的主键只是Django auto添加的id。 序列化模型B时，我需要获取模型A的组织和名称。需要读取和写入。 

My design is as following about Django ModelSerializer. There are model A and model B. Model B has a foreign key field of Model A. For some reasons, I can not use the primary key directly to serialize Model B. As my thought, what I need is to serialize two other fields(unique together in Model A).
 
And I see the SlugRelatedField must be used for one slug field. I searched there is a NaturalKeyField can support NaturalKeyField. But it looks like it is superseeded by django-rest-framework. But I checked the django-rest-framework, there is no such field at all. Can anyone help?? What should I do?
 
The code is as following. Model A
 
class AssetModel(models.Model):
    org = models.ForeignKey(Org, related_name='models')
    name = models.CharField(max_length=128)
    model_type = models.SmallIntegerField(default = 3,choices = MODEL_TYPE )
    directory = models.CharField(max_length = 128)
    ...
    class Meta:
        unique_together = ('org', 'name',)
 
Model B
 
class Dataitem(models.Model):
    mod = models.ForeignKey(AssetModel, related_name='dataitems')
    name = models.CharField(max_length=128)
    data_type = models.SmallIntegerField(default =0,choices = DATAITEM_DATATYPE)
    ...
 
Serializer of model A
 
class AssetModelSerializer(serializers.ModelSerializer):
    org =  serializers.SlugRelatedField(queryset=Org.objects.all(), slug_field='name')
    class Meta:
        model = AssetModel
        fields = ('org', 'name', 'model_type',..
 
Serializer of model B
 
class DataitemSerializer(serializers.ModelSerializer):
    class Meta:
        model = Dataitem
        fields = ('mod', 'name','data_type'...)
 
The primary key of Model A is just a id Django auto added. When serialize the model B, I need to get the org and name of model A. Both read and write are needed.

原文：https://stackoverflow.com/questions/34784979