December 2018
Beginner to intermediate
404 pages
10h 14m
English
Content preview from Odoo 12 Development Essentials - Fourth Edition
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Relationships between models
Non-trivial business application have a structured data model, and need to relate the data from the different entities involved. To do this, we need to use relational fields.
Looking again at our Library app, in the book model we can see the following relationships:
- Each book can have one publisher. This is a many-to-one relationship, implemented in the database engine as a foreign key. The inverse is a one-to-many relationship, meaning that each publisher can have many books.
- Each book can have many authors. That's a many-to-many relationship. The inverse relationship is also a many-to-many, since each author can have many books.
We will explore each of these relationships in the next sections.
A particular ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.