Add dynamic method from plugin using traits - not working

[Yingliang Du]

I just followed the user guide to add a dynamic method to controllers using trait from plugin. 

The following are my code:

---Trait---

package com.ylw.gorm

trait DateTrait {

    Date currentDate() {

        return new Date()

    }

}

---TraitInjector---

package com.ylw.gorm

import grails.compiler.traits.TraitInjector

import groovy.transform.CompileStatic

@CompileStatic

class ControllerTraitInjector implements TraitInjector {

    @Override

    Class getTrait() {

        DateTrait

    }

    @Override

    String[] getArtefactTypes() {

        ['Controller'] as String[]

    }

}

---Controller---

@Transactional(readOnly = true)

class MyDomainController {

    static allowedMethods = [save: "POST", update: "PUT", delete: "DELETE"]

    def testTrait() {

        render "The current date is -> " + currentDate()

    }

    ...

}

I am expecting the controller will know the currentDate() method from the trait. But I got the following error in the browser:

Caused by MissingMethodException: No signature of method: com.ylw.gorm.MyDomainController.currentDate() is applicable for argument types: () values: []

Possible solutions: create()

->>   90 | methodMissing in grails.artefact.gsp.TagLibraryInvoker$Trait$Helper

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 

|     12 | $tt__testTrait in com.ylw.gorm.MyDomainController

|     93 | doInTransaction in grails.transaction.GrailsTransactionTemplate$2

|     90 | execute   in grails.transaction.GrailsTransactionTemplate

|   1145 | runWorker in java.util.concurrent.ThreadPoolExecutor

|    615 | run       in java.util.concurrent.ThreadPoolExecutor$Worker

^    745 | run . . . in java.lang.Thread

What I did wrong?

Thanks for help!

Yingliang