December 2013
Beginner to intermediate
222 pages
5h 13m
English
Content preview from Grails 2: A Quick-Start GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Many-to-Many Relationships
One of the concerns about bringing in a sponsor for a technical event is that the whole thing might turn into a commercial for a vendor. That becomes much less of a concern if there are multiple sponsors for an event. On the other hand, a single company might be interested in sponsoring more than one event. So, should a TekEvent have a collection of Sponsor instances, or should Sponsor have a collection of TekEvent instances? The short answer is both. The longer answer, which we’ll get to shortly, is neither.
The relationship between TekEvent and Sponsor is a many-to-many relationship. Grails supports many-to-many relationships implicitly by having each class include the other in its hasMany block. In this arrangement, ...
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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.