Grails Workshop - Dallas TechFest 2011

THE POWER OF PERSPECTIVE

Grails Workshop
Dallas TechFest 2011
August 13, 2011

Erik Weibust
@erikweibust
Copyright © 2011 Credera. All Rights Reserved.

www.credera.com

Who am I? Erik Weibust…

 Husband / Father
 Fightin’ Texas Aggie
 Sports Fan
 Blogger
 Twiter-er… tweeter?
 Fan of Java and the JVM (Evangelist)
– President of JavaMUG
– Founder of the Spring Dallas Users Group (SDUG)
– Co-Founder of the DFW Groovy – Grails Users Group (DFW2GUG)
 Senior Architect at Credera
– 14 years experience as an IT Professional
– 12 years experience with Java
– Last 4 years at Credera

Copyright © 2011 Credera.
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All Rights Reserved.
T H E P O W E R O F P E R S P E C T I V E

www.credera.com

About Erik Weibust: Husband, Father, and Fightin’ Texas Aggie

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About Erik Weibust: Sports Fan

 Text Hee

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About Erik Weibust: Blogger / Twitter-er

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About Erik Weibust: Spring Dallas UG, DFW 2GUG, JavaMUG President

 Text Here

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About Erik Weibust: Senior Architect at Credera

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Agenda

 What is Grails and why would I use it
 Installing and Developing with Grails
 Wait a minute, what is Groovy
 What are we Building?
 Creating our Grails Application – Step 1
We’ve Got a Lot to Do… Let’s Get Started!
 Creating our Domain Model – Step 2
 We need Data – Step 3
 Lets tweak these boring Views – Step 4
 Are you too good for your Home – Step 5
 Custom URL Mappings – Step 6

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What is Grails and why would I use it

 Rapid Application Development Framework
 Tightly bound to Java Ecosystem (can be both positive and negative)
 Built on top of frameworks you know and use: Spring, Spring MVC, Hibernate, and Tomcat
 Convention over Configuration
 Makes web development simpler with Groovy

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Installing and Developing with Grails

 Install Java5 SE SDK and set JAVA_HOME environment variable
 Download latest Grails release (http://grails.org/Download)
 Extract Grails archive into appropriate location (I use C:devsdks)
 Create GRAILS_HOME env variable that points to location in previous step
 Append %GRAILS_HOME%bin to your PATH variable

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Wait a minute, what is Groovy

 Programming lang on JVM
 Highly compatible with Java
– Seriously, rename .java file with .groovy and you’re done
– Optional semicolons
– Sometimes optional parentheses (I always use, makes code more readable)
– “Look Ma, no returns”
 Properties and it’s “cousin feature” named-argument constructors
 Simple debugging when learning: println and thingy.class.name
 Lists, Maps, and Closures

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Domain Class in Java: Person.java

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Same Domain Class in Groovy: Person.groovy

Look at this Person
class … Just 3 lines
of code! Previous
slide shows same
class in Java took
26 lines!

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The Kitchen Sink of Groovy “stuff”

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What are we Building? A Web-based Conference Management Tool

 Grails-based version of TechFest
website
– Runs on open-source
technology
– Fixes the many to many
Speaker – Session
relationship

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Dallas TechFest Domain Model

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Creating our Grails Application – Step 1

 Create with the following
command:
 $ grails create-app techfest
 We have a working, runnable
application…
 Lets take a look, run the
following commands:
 $ cd techfest
 $grails run-app

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Creating our Grails Application – Step 1 cont.

 Here you can see the standard
Grails project structure
– Our application code is
primarily inside of grails-
app/
– Have a lib/ for application
specific jar files (JDBC driver)
– Testing is baked into Grails,
we have unit and integration
tests in test/
– All standard CSS, JavaScript
and images are in web-app/

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Creating our Domain Model – Step 2

 Create our domain classes with the
following commands:
– $ grails create-domain-class Speaker
– $ grails create-domain-class Session
– $ grails create-domain-class Sponsor

Now implement our Speaker

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Creating our Domain Model – Step 2 cont.

 We also need to create our controllers so
we can interact with our domain classes
 Run the following commands:
– $ grails create-controller Speaker
– $ grails create-controller Session
– $ grails create-controller Sponsor Now lets take a look at our Speaker!

 Now edit each controller, replacing our
index {} closure property with the
Finished version of our Speaker Controller,
following scaffolding statement:
the other controllers should look the same
– def scaffold = true

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 Now we can finish our Speaker, adding the
logical constraints

 Highlights on Constraints: Fully implemented Speaker w/ constraints

– Validation on Creation
– Declarative syntax
– DSL

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 Lets complete our Session and Sponsor
Domain Model classes
Our Sponsor Class

And our Session Class

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We need Data – Step 3

 OUCH! That was painful
entering our “test” data
each time we restarted our
server…. BootStrap.groovy
to the rescue.

 Back to Scaffolding:
– Lets convert from
dynamic views and
controllers to concrete
implementations
 $ grails generate-all “*”
– Enter “Y” for yes, to
overwrite our original
files
 Lets take a look…

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Lets tweak these boring Views – Step 4

 Lets “clean up” our
Speaker page:
– Open grails-
app/views/speaker/sh
ow.gsp
– Replace Show Speaker
text with Speaker’s
name
– Remove the database
id field from our view
– Make the Speaker’s
name link back to the
Speaker record (make
sure and ask me why)

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Lets tweak these boring Views – Step 4 cont.

 Start by replacing the <h1>
with our new <h1> that
utilizes the ${fieldValue(
bean:speakerInstance,
field:”firstName” ) } syntax
 Delete or comment-out
the first three <tr>s to
remove: id, firstName, and
lastName
 Add g:link to create a link
back to our record
 See Grails documentation
for more info on <g:link>
http://www.grails.org/doc/
latest/ref/Tags/link.html

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Are you too good for your Home – Step 5

 First step is swapping out
the Grails logo for the
TechFest logo
– Copy image file to web-
app/images
– Update grails-
app/views/layouts/main
.gsp

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Are you too good for your Home – Step 5 cont.

 Second step in refactoring
our “home” page is
updating grails-
app/views/index.gsp
– Make the following 2
CSS changes to move
our nav bar to the right
– Then add the “nav”
<div> right after the
<body> tag to get our
navigation bar added to
our “home” page
 Last step is two pull in the
two sponsor logos and the
“copy” from our thumb
drives

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Custom URL Mappings – Step 6

 Last “tweak” we will
make to our techfest
application is writing
some custom URL
mappings to match the
URL patterns used on grails-app/conf/UrlMappings.groovy
the
http://dallastechfest.co
m site
 Make the following
additions to our
UrlMappings.groovy file

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Finished: We have our TechFest website…

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Where to go for more information

 Grails Website
– Phenomenal Documentation
– Screencasts
– Tutorials
 Books
– Grails: A Quick-Start Guide by Dave Klein (http://pragprog.com/book/dkgrails/grails)
– The Definitive Guide to Grails by Graeme Rocher, Jeff Brown
(http://www.apress.com/9781590599952)
 Magazine
– GROOVYMAG (http://groovymag.com/)
 DFW Groovy – Grails Users Group (http://www.dfw2gug.org or @dfw2gug)

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www.credera.com

Credera is a Business and Technology Consulting Firm that Focuses on Leveraging Proven
Technologies to Enable our Clients Business Strategy
 Our Company  Our People
– Full-service business and technology – Credera’s professionals possess a unique
consulting firm combination of deep technical expertise with
extensive business backgrounds
– Provide business and technology solutions
that offer measurable value to our clients – Backgrounds include business, technology, and
strategy management consulting with some of the
– Deliver value by leveraging our people’s most well-known and respected consulting firms
accumulated industry and management in the world
experience with their deep technical
expertise – Have served many influential corporations in a
variety of industries over the past 20 years
– Established in 1999

– Offices in Dallas, Austin, Denver
 Sample Clients

 Our Services
– Management Consulting

– Technology Solutions

– Business Intelligence

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Q&A

Thank you for attending!

Contact Information:
Erik Weibust
erik@weibust.net
http://erik.weibust.net
Twitter: @erikweibust

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Grails Workshop - Dallas TechFest 2011

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