(Quick Reference)
errors
Purpose
An instance of the Spring
Errors interface containing errors associated with this controller.
Examples
class DemoController { static allowedMethods = [updatePerson: 'PUT'] def generateReport(int size) {
if(hasErrors()) {
errors.allErrors.each {
println it
}
}
} def updatePerson(SomeDomainClass sdc) {
// if params.id is found then a call
// will have been made to SomeDomainClass.get(params.id)
// to retrieve the instance from the database.
// if no matching instance is found then
// sdc will be null and the controller
// will not have errors. If params.id
// is found and an exception occurs while
// trying to retrieve the instance then
// sdc will be null and an error will
// be added to the controller
if(sdc == null && hasErrors()) {
errors.allErrors.each {
println it
}
}
}
}Description
The
errors property is used by Grails while processing a request. Errors are generated when a type conversion happens while processing action parameters or if an exception is thrown while trying to retrieve a domain class command object from the database.
See
hasErrors.
