writing most common queries as model class method!

[Amir Jamshidi]

Hi, 

I tried to write a classmothods/ instance method in a Model in order to run most common query from the model but got errors like below :

""AttributeError: Manager isn't accessible via ... instances""

example code:

class Profile(model.Model):

    name = model.Charfield(...)

    address = model.Charfield(...)

    ....

    @classmethod

     def count_of_users(cls):

           return cls.objects.all()  #example query

     def all_users(self):

          return self.objects....

My purpose is to have most common and important queries in a method to be called within application. (Its a good way for documenting most common queries as well).What is the best practice for this case?

[Chukwudi Onwusa]

Write that method in your views, and return render(request,'templateName.html', optional) and go to your templates

 and call your desired or important attribute with the instance of the class using Django template tag 

{{class_instanceInMethodInsideView.modelsAtrributeName}} as many attribute as you desire.

Regards....

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[Ryan Nowakowski]

Hey Amir,

Django best practice is to put all common query methods in the model manager class instead of the model class itself.

- Ryan N

[Amir Jamshidi]

Thanks Ryan,

Exactly, 

as explained below:

https://stackoverflow.com/questions/74407036/how-to-store-important-queries-in-djando-models-itself/74407130#74407130

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___________________________________
Amir JamshidiJam

Computer Engineering at Shiraz University

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