多态对象的Mongodb模式设计 [英] Mongodb schema design for polymorphic objects
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问题描述
我是MongoDB的新手,正在尝试为一组python对象设计一个简单的架构.我在处理多态性的概念上遇到了困难.
I'm new to MongoDB and am trying to design a simple schema for a set of python objects. I'm having a tough time working with the concept of polymorphism.
下面是一些伪代码.您将如何在MongoDB模式中表示此继承层次结构:
Below is some pseudo-code. How would you represent this inheritance hierarchy in MongoDB schema:
class A:
content = 'video' or 'image' or 'music'
data = contentData # where content may be video or image or music depending on content.
class videoData:
length = *
director = *
actors = *
class imageData:
dimensions = *
class musicData:
genre = *
我面临的问题是A.data的架构取决于A.content.如何在mongodb模式中表示A?
The problem I'm facing is that the schema of A.data depends on A.content. How can A be represented in a mongodb schema?
推荐答案
您的文档可能如下所示:
Your documents could look like this:
{ _type: "video",
data: {
length: 120,
director: "Smith",
actors = ["Jones", "Lee"]
}
}
因此,基本上,数据"指向具有文档类型指定字段的嵌入式文档.
So, basically, "data" points to an embedded document with the document's type-specified fields.
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