Class 基于视图 - 未在数据库中创建字段（python Inherits\django cbv）

Question

我正在尝试按照本教程创建模型继承：https://www.digitalocean.com/community/tutorials/understanding-class-inheritance-in-python-3

一切正常。可以在 child 中访问 FirstName 属性并显示在视图中，但是当我运行 makemigration/migrate 时，继承字段不会在 table 在数据库中。 (core-shark / core-trout)

我做错了什么？是否可以使用 python 继承和 CBV，通过 makemigration/migrate?

在数据库中创建字段

model.py

class Fish(models.Model):
    def __init__(self, first_name, last_name="Fish"):
        self.first_name = first_name
        self.last_name = last_name

    def swim(self):
        print("The fish is swimming.")

    def swim_backwards(self):
        print("The fish can swim backwards.")

    class Meta:
        verbose_name = 'Fish'
        abstract = True     
        
    def __str__(self):
        return self.first_name


class Shark(Fish):
    def __init__(self, first_name, last_name="Shark", skeleton="cartilage", eyelids=True):
        self.first_name = first_name
        self.last_name = last_name
        self.skeleton = skeleton
        self.eyelids = eyelids

    def swim_backwards(self):
        print("The shark cannot swim backwards, but can sink backwards.")


class Trout(Fish):
    def __init__(self, water ='', price = 0):
        self.water = water
        self.price = price
        super().__init__(self)

    class Meta:
        verbose_name = 'Trout'

view.py

class IndexView(TemplateView):
    template_name = 'index.html'

    def get_context_data(self, **kwargs):

        context = super(IndexView, self).get_context_data(**kwargs)      
        sammy = Shark("Sammy")
        terry = Trout()
        terry.first_name = "Terry"

        context['sammy'] = sammy
        context['terry'] = terry
 
        return context

index.html

...
<body style="color:red">
    <h1>Fish Name: {{sammy.first_name}}</h1>
    <h1>Fish Name: {{terry.first_name}}</h1>
</body>
...

[2

project git

Answer 1

根据 Django Documentation for Models，您需要将数据库字段定义为 Class 属性。

I.o.w:

class Fish (models.Model):
    
    first_name = models.CharField(max_length=64)
    last_name = models.CharField(max_length=64)
    
    def __init__(self, first_name, last_name="Fish"):
        self.first_name = first_name
        self.last_name  = last_name

这样做将允许在您运行迁移时在数据库中创建它们。

Class 基于视图 - 未在数据库中创建字段（python Inherits\django cbv）

Class Based View - Fields aren't created in database (python Inherits\django cbv)

python

django

database-migration

python-3.x

django-class-based-views