grails - display flash message

Question

I’m new to Grails, and I have a question that should be easy for most of you.

I have a page displaying an object list. I want to display a message if there’

Answer 1

The flash object is a Map which stores key/value pairs, so you can define your own key for error messages. For example:

try {
    instanceToDelete.delete(flush: true)            
    flash.message = "successfully deleted object"
 }
 catch (DataIntegrityViolationException e) {
    flash.error = "could not delete object"            
 }
redirect(action: "list", id: params.id)

Then you can check the flash object containing the error key, and use a different style for that kind of message:

  
${flash.error}


  
${flash.message}