Grails: A Quick-Start Guide by Dave Klein PDF

By Dave Klein

ISBN-10: 1934356468

ISBN-13: 9781934356463

Java net improvement is notoriously tedious, yet assistance is at the manner: Grails. utilizing the primary of convention-over-configuration and the dynamic Groovy programming language, Grails takes the soreness out of internet improvement and brings again the thrill. This e-book gets you up and working with Grails by means of placing it to exploit in developing an unique, operating program from begin to end.

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Additional resources for Grails: A Quick-Start Guide

Sample text

The last line of output tells us where to go to see our application in action. 1, we can see what we get by browsing to that location. It may not look like much yet, but having a working application from the very beginning is just powerful. It gives us an excellent feedback loop. We’ll be maintaining that runnable state, and, consequently, that feedback loop, right through to deployment. 31 I TERATION Z ERO Starting with All Windows Intact In their book The Pragmatic Programmer [HT00], Dave Thomas and Andy Hunt discuss the “Broken Window” theory as it relates to software development.

By assigning our new TekEvent instances to a variable and then saving them in a separate step, we’re able to do a little error checking in case we mistyped something; when a domain class instance fails to save, its errors property will be populated with one or more Error objects, which will give us some clues as to what went wrong. Once you’ve saved those changes, run the application again. 6, on page 50. If your new data doesn’t show up, check your console output to see whether anything was reported by our sophisticated error-handling system.

Constraints are a way of telling Grails more about the properties of our domain class. They are used for validation when saving, for determining some aspects of database schema generation, and for laying out scaffolded views. We’ll look at those first two uses of constraints later (see the sidebar on page 74), but that last one is what we’re going to take advantage of now. 5 Inside this block, we list each of our properties, followed by parentheses. Inside the parentheses, we can include one or more key/value pairs that represent rules for that property.

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