Why values of list is changing while sending to a service

Question

I am new with grails and am developing a web application.

I have a List of long values which is getting from ids of Domain class objects.

Initially this List is like [1,2,3]. I need to use this list of values in my service class for saving the associations.

But the same List is getting in service class as [49,50,51]

Why this difference of 48 is occurred? and how can i get the List as same as i sent.

Controller class:

def createQuestion(CreateQuestionCommand createQuestionCmd) { 
  if( createQuestionCmd.hasErrors() ) { 
    render(view:"create_question", model:[createQuestionCmd:createQuestionCmd , tags:Tag.list()]) 
  } else { 
    Question question = new Question() 
    question.title=createQuestionCmd.title 
    question.description=createQuestionCmd.description 
    List tags= createQuestionCmd.tags 
    question = questionService.create(question,tags) 
    render(view: "question_submitted") 
  } 
}

service class:

def create(Question question, List<Long> tagId) { 
  List<Tag> tagList=getTagsById(tagId) 
  question.save( failOnError:true ) 
  Iterator itr=tagList.iterator(); 
  while(itr.hasNext()) { 
     Tag tag=itr.next() 
     question.addToTags(tag).save() 
  }
}

def getTagsById(List tagId){ 
  Iterator itr=tagId.iterator(); 
  List<Tag> tags 
  while(itr.hasNext()) { 
    long id=itr.next() 
    println "value of id is : " 
    println id 
    println id.getClass().getName() 
    Tag tag=Tag.findById(id) 
    tags.add(tag) 
  } 
  return tags 
}

Answer 1

CreateQuestionCmd.tags are List<String> and you are trying to place that to List<Long>