django如何使用属性创建列条目

class Process(models.Model):
    name = models.CharField(max_length=50)
    start_utc = models.TimeField(db_column='start', null=True, blank=True)
    end_utc = models.TimeField(db_column='end', null=True, blank=True)

我想添加一个属性

我尝试使用@property方法,如

https://docs.djangoproject.com/en/2.1/topics/db/models/

其中,@属性在类定义中没有属性

class Process(models.Model):
    name = models.CharField(max_length=50)
    start_utc = models.TimeField(db_column='start', null=True, blank=True)
    end_utc = models.TimeField(db_column='end', null=True, blank=True)

    @property
    def should_run(self):
        now = dt.datetime.utcnow().time()
        print(self.__str__(), now, self.start_utc, self.end_utc)
        return self.start_utc < now < self.end_utc

但这样根本就没有创建列条目。

我也试着用经典的方式

class Process(models.Model):
    name = models.CharField(max_length=50)
    start_utc = models.TimeField(db_column='start', null=True, blank=True)
    end_utc = models.TimeField(db_column='end', null=True, blank=True)
    _should_run = models.BooleanField(default=False, db_column="should_run")

    @property
    def should_run(self):
        now = dt.datetime.utcnow().time()
        print(self.__str__(), now, self.start_utc, self.end_utc)
        return self.start_utc < now < self.end_utc

    @should_run.setter
    def should_run(self, val):
        self._should_run = val

如何使它能够使用从@property getter获取的值创建一个列?

编辑:

from .models import Process

class ProcessTable(tables.Table):
    class Meta:
        model = Process
        template_name = 'django_tables2/semantic.html'

将呈现该表

from .models import Process
from .tables import ProcessTable

def index(request):
    p = Process.objects.all()
    context = dict(table=ProcessTable(p))
    return render(request, 'processes/index.html', context)

我想得到的是一个显示4列的呈现表

name, start_utc, end_utc, should_run