AttributeError: 'Manager' 对象没有属性

Question

I'm using Python 3.7. I'm having a lot of trouble figuring out how and where I should put a method that creates and saves multiple objects. I have this in my models.py file

class ArticleStatManager(models.Manager):
    def save_main_article(self, article):

Then in another part of the code, I call

ArticleStat.objects.save_main_article(article)

but this results in the error

    ArticleStat.objects.save_main_article(article)
AttributeError: 'Manager' object has no attribute 'save_main_article'

What am I doing wrong or where should I be placing this code so that I can invoke it properly?

Answer 1

You need to tell the model to use your custom model manager.

class ArticleStat(models.Model):
    objects = ArticleStatManager()

(DOCS)

Answer 2

As @DanielRosman point out in his comment, you have to set ArticleStatManager as default manager (you want it through attribute objects , so it has to be the default manager)

class ArticleStat(models.Model):
    objects = ArticleStatManager()

You could also set a different manager just for that purpose:

class ArticleStat(models.Model):
    objects = Manager()
    articlesmanager = ArticleStatManager()

and then you could:

ArticleStat.articlesmanager.save_main_article(article)