如何在django中继承对象? [英] How to Inherit objects in django?
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问题描述
如果可以的话,是否在models.py中完成?
,它是如何工作的?
谢谢...
解决方案>
与python inheritence完全一样
class Vehicle(Model):
name = models.TextField )
class Car(Vehicle):
passenger = PositiveIntegerField()
class卡车(车辆):
tonnage = FloatField()
>>> Car.objects.create(name ='Beetle',passenger = 5)
< Car:name =甲壳虫,乘客= 5>
>>> Truck.objects.create(name ='Mack',tonnage = 4.5)
< Truck:name =Mack,tonnage = 4.5>
>>> Vehicle.objects.all )
[< Vehicle:name =Beetle>,< Vehicle:name =Mack>]
>>> v = Vehicle.objects.get(name ='Beetle')
>>> (bool(v.car),bool(v.truck))
(True,False)
>>> v.car
< Car:name =甲壳虫,乘客= 5>
>>> v.truck
无
https://docs.djangoproject.com/en/dev/topics/db/models/#model-inheritance
is there a link or tutorial on how to inherit an objects in django? let us say that i have a vehicle as a parent and a car and a truck for it's child.
if it is possible, is it done in the models.py? and how is it work?
thanks...
解决方案
Exactly the same as python inheritence
class Vehicle(Model):
name = models.TextField()
class Car(Vehicle):
passengers = PositiveIntegerField()
class Truck(Vehicle):
tonnage = FloatField()
>>> Car.objects.create(name='Beetle', passengers = 5)
<Car: name="Beetle",passengers=5>
>>> Truck.objects.create(name='Mack', tonnage=4.5)
<Truck: name="Mack,tonnage=4.5>
>>> Vehicle.objects.all()
[<Vehicle: name="Beetle">,<Vehicle: name="Mack>]
>>> v = Vehicle.objects.get(name='Beetle')
>>> (bool(v.car), bool(v.truck))
(True, False)
>>> v.car
<Car: name="Beetle",passengers=5>
>>> v.truck
None
https://docs.djangoproject.com/en/dev/topics/db/models/#model-inheritance
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