let pages = surveyData.pagerItems; // Pages is a model which contains an array of another model called question
 let questions = self.pages[indexPath.section].questionItems.filter{$0.id != questionId};
 self.pages[indexPath.section].questionItems = questions;

self.pages[indexPath.section].questionItems = questions;
 self.surveyData.questionCount = self.surveyData.questionCount - 1;

self.pages[sourceIndex.section].questionItems.remove(at: sourceIndex.row)