django-rest-framework + django-polymorphic ModelSerialization [英] django-rest-framework + django-polymorphic ModelSerialization

问题描述

我想知道是否有人拥有将Django REST框架与django-polymorphic结合在一起的Pythonic解决方案。

给定：

$ $ $ $ $ $ $ $ $


class照片（GalleryItem）：
custom_photo_field = models.CharField（）

class视频（GalleryItem）：
custom_image_field = models.CharField（）

如果我想要在django-rest-framework中的所有GalleryItem的列表，它只会给我GalleryItem（父模型）的字段，因此：id，gallery_item_field和polymorphic_ctype。这不是我想要的。我想要custom_photo_field如果它是一个照片实例和custom_image_field如果它是一个视频。

解决方案

到目前为止，我只测试了GET请求，这样做：

  class PhotoSerializer（serializers.ModelSerializer）：
 
 class Meta：
 model = models.Photo 
 
 
 class VideoSerializer（serializers.ModelSerializer）：
 
 class Meta：
 model = models.Video 
 
 
 class GalleryItemModuleSerializer（serializers.ModelSerializer）：
 
 class Meta：
 model = models.GalleryItem 
 
 def to_representation（self，因为GalleryItem是多态的

如果isinstance（obj，models.Photo）：
返回PhotoSerializer（obj，context = self.context）.to_representation（obj）
 elif isinstance（obj，models.Video）：
 return VideoSerializer（obj，context = sel f.context）.to_representation（obj）
 return super（GalleryItemModuleSerializer，self）.to_representation（obj）
  

对于POST和PUT请求，您可能想要使用to_internal_value def来替代to_representation定义进行类似的操作。

I was wondering if anyone had a Pythonic solution of combining Django REST framework with django-polymorphic.

Given:

class GalleryItem(PolymorphicModel):
    gallery_item_field = models.CharField()

class Photo(GalleryItem):
    custom_photo_field = models.CharField()

class Video(GalleryItem):
    custom_image_field = models.CharField()

If I want a list of all GalleryItems in django-rest-framework it would only give me the fields of GalleryItem (the parent model), hence: id, gallery_item_field, and polymorphic_ctype. That's not what I want. I want the custom_photo_field if it's a Photo instance and custom_image_field if it's a Video.

解决方案

So far I only tested this for GET request, and this works:

class PhotoSerializer(serializers.ModelSerializer):

    class Meta:
        model = models.Photo


class VideoSerializer(serializers.ModelSerializer):

    class Meta:
        model = models.Video


class GalleryItemModuleSerializer(serializers.ModelSerializer):

    class Meta:
        model = models.GalleryItem

    def to_representation(self, obj):
        """
        Because GalleryItem is Polymorphic
        """
        if isinstance(obj, models.Photo):
            return PhotoSerializer(obj, context=self.context).to_representation(obj)
        elif isinstance(obj, models.Video):
           return VideoSerializer(obj, context=self.context).to_representation(obj)
        return super(GalleryItemModuleSerializer, self).to_representation(obj)

For POST and PUT requests you might want to do something similiar as overriding the to_representation definition with the to_internal_value def.

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