November 2016
Beginner to intermediate
298 pages
6h 10m
English
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Computed fields
Fields can have values calculated by a function, instead of simply reading a database stored value. A computed field is declared just like a regular field, but has the additional compute argument defining the function used to calculate it.
In most cases computed fields involve writing some business logic, so we will develop this topic more in Chapter 7, ORM Application Logic - Supporting Business Processes. We will still explain them here, but will keep the business logic side as simple as possible.
Let's work on an example: Stages have a fold field. We will add to To-do Tasks a computed field with the Folded? flag for the corresponding Stage.
We should edit the TodoTask model in the todo_model.py file to add the following:
# class ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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