..code: bash
sudo mkdir /opt/grails sudo chown martin:martin /opt/grails cd /opt/grails
curl -O http://dist.springframework.org.s3.amazonaws.com/release/GRAILS/grails-2.4.3.zip
unzip grails-*.zip
Besides these two you have to make sure that ${JAVA_HOME} points to a JDK, not a JRE.
..code: bash
export GRAILS_HOME=/opt/grails/grails-2.4.3 export PATH="${GRAILS_HOME}/bin:${PATH}"
# if not yet done: export JAVA_HOME="/usr/lib/jvm/java-7-openjdk-amd64/"
# test if everything is running grails --version
This follows the online example.
..code: bash
cd ~/Arbeit/Groovy/Grails grails create-app helloworld cd helloworld grails
The last command starts the grails console.
For every new page you want to be shown, you have to add a controller:
..code: grails-console
grails> create-controller hello
This yields a new controller in grails-app/controllers/helloworld/HelloController.groovy. Add some code to get a Hello World:
..code: groovy
class HelloController {
- def index() {
render "Hallo World"
}
}
and run it from the grails shell with grails> run-app -Dserver.port=40080 and visit the grails start page to get to your app. You may stop it with grails> stop-app. In order to deploy the app on a JavaEE application server, use grails> war.
First you need a domain class. This is what represents persistent data
..code: grails-console
grails> create-domain hightime.Question hightime.QuestionSubject grails> create-domain hightime.Participant hightime.Answer
Go to the grails-app/domain/hightime/Question.groovy and add some properties:
..code: groovy
package hightime
- class Question {
QuestionSubject subject String question
static hasMany = [answers: Answer]
- static constraints = {
subject nullable: false question unique: subject
}
}
Do the same for the other domain classes. Now add a controller for entering questions: Note that we use the very same name for it!
..code: grails-console
grails> create-controller hightime.Question
The most simple UI can be obtained by using:
..code: grails
package hightime
class QuestionController { // we could also use true as a value here static scaffold = Question }
Now create scaffolding-controllers for all domain classes you want to be able to edit as well. In our case, it is only Participant because we will give the QuestionSubject and Questions programmatically later.
You can now run this simple application by using grails> run-app -Dserver.port=40080
In order to alter the way the app looks like, do grails> install-template.