Django-模型内的函数。如何从视图中调用它？ [英] Django - Function inside a model. How to call it from a view?

问题描述

我正在Django中设计模型，但我不知道这是否是最好的方法。我有一个名为历史记录的模型，并且在此模型中，我有一个专门的函数来处理该模型的插入。

I'm designing a model in Django but I don't know if this is the best way. I have a model called "History" and inside this model I've a specialized function that will handle the inserts to this model.

替代1

class History(models.Model):
    field1 = models.ForeignKey(Request)
    field2 = models.BooleanField()
    field3 = models.DateTimeField()

    def __unicode__(self):
        return str(self.field1.id)

    class Meta: #
        ordering = ['-field3']

    def insert_history(self):
        # Here I will have some business logic to insert the data to the history model

要将数据插入历史记录模型，我将始终必须使用 insert_history功能。

To insert data to the History model I will allways have to use the "insert_history" function.

我的问题是：

上面的代码正确吗？

如果是，如何从视图中调用插入历史记录？

替代2

我已经测试了另一个替代方法，但是可以感觉不正确。代码如下所示：

I've another alternative that I've tested and it works, but does not feel the right way. The code looks like this:

class History(models.Model):
    field1 = models.ForeignKey(Request)
    field2 = models.BooleanField()
    field3 = models.DateTimeField()

    def __unicode__(self):
        return str(self.field1.id)

    class Meta: #
        ordering = ['-field3']

def insert_history(field1, field2, field3):
    # Here I will have some business logic to insert the data to the history model

我从这样的视图中调用它：

And I call it from a view like this:

from app.models import insert_history

insert_history('1', True, 'some_date')

这样做的正确方法是什么？如果替代方法1正确，我该如何从视图中调用 insert_history？

what is the correct way of doing it? If the alternative 1 is correct, how can I call the "insert_history" from a view?

最好的问候

推荐答案

insert_history是否使用self？还是创建一个新的历史记录对象？

Does insert_history use self? Or does it create a new History object?

如果它创建了一个新对象，我会这样做：

If it creates a new object, I'd do it like this:

class History(models.Model):
    @classmethod
    def insert_history(cls, field1, field2, field3):
        # Here be code

调用它

from app.models import History
History.insert_history(field1, field2, field3)

BTW，创建新对象的方法的常规名称是 create 。另外，请查看 https：//docs.djangoproject。 com / en / 1.9 / ref / models / instances /＃creating-objects

BTW, the conventional name for a method creating new objects is create. Also, have a look at https://docs.djangoproject.com/en/1.9/ref/models/instances/#creating-objects

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