In our custom listener, the method ‘onPersistenceEvent’ is called on all GORM events that we filter to what we interested – PreInsert, PreUpdate
Create a groovy file under src/groovy suppose named 'FieldValidationListener.groovy' with the following contents. And create required method in your domain class, suppose one method can be named: 'doValidationPreInsert' or 'doValidationPreUpdate'.
package com.groovy.fieldSetting import grails.util.Holders import org.codehaus.groovy.grails.commons.GrailsApplication import org.grails.datastore.mapping.core.Datastore import org.grails.datastore.mapping.engine.event.* import org.springframework.context.ApplicationEvent /** * Created by pritom on 17/02/14. */ class FieldValidationListener extends AbstractPersistenceEventListener { public FieldValidationListener(Datastore datastore) { super(datastore) } @Override protected void onPersistenceEvent(AbstractPersistenceEvent event) { String operation; switch (event.eventType) { case EventType.PreInsert: operation = "PreInsert" break; case EventType.PreUpdate: operation = "PreUpdate" break; } if(operation) { String methodName = "doValidation${operation}" println "Searching for method: ${methodName}" if (event.entityObject.respondsTo(methodName)) { try { event.entityObject."${methodName}"() } catch (Exception exp) { event.cancel(); throw exp; } } } } @Override boolean supportsEventType(Class<? extends ApplicationEvent> eventType) { if ([PreInsertEvent, PreUpdateEvent].any { def supportedType -> if (supportedType.isAssignableFrom(eventType)) { return true } else { return false } }) { return true } else { return false } } public static void initialize(GrailsApplication application) { application.mainContext.eventTriggeringInterceptor.datastores.each { k, datastore -> Holders.applicationContext.addApplicationListener(new FieldValidationListener(datastore)) } } }
And initialize start listening, insert the following code block into 'BootStrap.groovy' [in 'init' method]:
FieldValidationListener.initialize(grailsApplication)
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