如何在spyne中实现抽象模型 [英] how to implement abstract model in spyne

问题描述

我需要使用Spyne实现抽象模型.

I need to implement an abstract model using Spyne.

实际上，作为一个简单的例子，我想管理一个车库业务.

In fact, let's say - as a simple example - that I want to manage a garage business.

然后我有以下课程:

class Vehicle(ComplexModel):
     ''' this class is abstract '''
     _type_info = [
         ('owner',Unicode)
     ]

class Car(Vehicle):
    _type_info = [
        ('color',Unicode),
        ('speed',Integer)
    ]

class Bike(Vehicle):
    _type_info = [
        ('size',Integer)
    ]

class Garage(ComplexModel):

    _type_info = [
        ('vehicles',Array(Vehicle))
    ]

当我想让所有车辆由我的车库管理时，我只会得到其车辆属性(在这里又称为所有者)，而不是其他.

When I want to get all vehicles managed by my garage, I will only get their Vehicle properties (aka owner here), and not the other ones.

有没有办法用Spyne管理抽象对象?

Is there a way to manage abstract objects with Spyne?

当然，一种简单的方法是:

Of course, a simple approach would be to have:

class Garage(ComplexModel):

    _type_info = [
        ('bikes',Array(Bike)),
        ('cars',Array(Car))
    ]

但我不喜欢它:如果这样做，我每次创建新的Vehicle类时都必须更改"Garage"类...我希望我的Garage类可以管理Vehicles，无论哪种类型的车辆.有可能吗?

but I don't like it: if I do that, I'll have to change my "Garage" class everytime I create a new Vehicle class... I want my Garage class to manage Vehicles, no matter what type of Vehicles it is. Is it possible?

推荐答案

对于Spyne 2.12.1-beta，输出多态性应在使用Array(Vehicle)语法的情况下(在为输出协议启用时)起作用.

With Spyne 2.12.1-beta, output polymorphism should work (when enabled for the output protocol) with the Array(Vehicle) syntax.

请在此处查看工作示例: https://github.com com/arskom/spyne/blob/a2d0edd3be5bc0385548f5212b7b4b6d674fd610/examples/xml/polymorphic_array.py

Please see working example here: https://github.com/arskom/spyne/blob/a2d0edd3be5bc0385548f5212b7b4b6d674fd610/examples/xml/polymorphic_array.py

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