CODEWITHSUNDEEP
grailsgroovy
Ron
Ron

Reputation: 513

Is there a way to make functions accessible across controllers in Grails?

I want to be able to create global functions, meaning a function I can use across controllers, kind of like helper methods.

So in one controller I could do

useful_function(string) etc... Is this possible?

I did create a class in src/groovy called SiteHelper, am I on the right track? I want the methods of the class SiteHelper to be able to be used throughout controllers.

Upvotes: 0

Views: 1228

Answers (4)

Ian Roberts
Ian Roberts

Reputation: 122364

The standard way to share logic between different components in Grails is to put it in a service, or alternatively in a taglib in the case of functions that need access to web-layer things like request/response/params/session/flash. You can call taglib tags as methods from any controller action:

MyTagLib.groovy

class MyTagLib {
  def sayHello = { attrs, body ->
    out << "Hello ${attrs.name}"
  }
}

MyController.groovy

def someAction() {
  def greeting = sayHello(name:"Ian")
  // ...
}

Upvotes: 0

Burt Beckwith
Burt Beckwith

Reputation: 75671

You can add it to the metaclass of all controller classes, for example in BootStrap.groovy:

class BootStrap {

   def grailsApplication

   def init = { servletContext ->
      for (cc in grailsApplication.controllerClasses) {
         cc.clazz.metaClass.useful_function = { String s ->
            return ...
         }
      }
   }
}

Upvotes: 3

vector
vector

Reputation: 7576

Yes, you're mostly on the right track. You may want to look at making it as a part of service layer.

http://grails.org/doc/latest/guide/services.html

Upvotes: 4

djechlin
djechlin

Reputation: 60768

I don't get what is nontrivial about this. It sounds exactly what Apache's StringUtils class or IOUtils class does. Yes, creating a SiteHelper with static methods and importing it will do what you want and is the typical practice for this in Java-influenced (and many other) languages.

Upvotes: -2

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