angularjs - Set ng select dropdown model to null when model does not exist in ng-options -

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Assume that I define the following drop down in the UI: 

  & lt ; Ng-model = "selected item" ng-options = "items as items. Item items from item items to item.id" & gt; & Lt; Option value = "" & gt; Please select ... & lt; / Options & gt; & Lt; / Select & gt;   $ scope.items = [{name: 'item1', id: 0}, {name: 'item2 ', Id: 1}]; $ Scope.selectedItem;   
 If I set the  $ scope.selectedItem  or the item is present in the value then the item is present in the array  {name: 'item1', Id: 1}  then angular preselects  'item1'  which is in line with expectation.  
 But if I have a bogus item that does not exist in the item array like  $ scope.selectedItem = {name: 'item 6', id: 6}  then angle preselects  'Please select ...'  which is expected in the UI, but the model still remains  {name: 'item 6', id: 6} .  
 For example, with a bogus item, model   {name: 'item 6', id: 6} ?  
 Instead of $ scope.selectedItem  to  null  in my case, the  $ scope.selectedItem  object is being saved in the database so that Filled in the future, I can not guarantee that the object will be present in the  $ scope.items  array. If the object is no longer present in Array, then I would like to set the model rather than retaining the stale object.  
 The obvious solution would be whether the object exists in array and if it does not manually set  $ scope.selected = null  in the controller, but wants to see if There was no easy or cleaner option.  
  Solution:   
 Optimized to use an instruction:  
 . Directive ('checker tap', function) {return {link: function (scope, element, attrs) {scope $ WatchCollection ('item', function (value) {// if $ scope.selectedItem does not exist in the item array ( Value) $ scope.selectedItem = null;})}}); In the constructor for your controller, you can only set $ scope.    
 
 
 to clear the selected ITem if the value is not present in the item array:  
  $ scope.items = [{name: 'item1', id: 0}, {name: 'item2', id: 1}]; $ Scope. Selected item = ($ scope.items.indexOf ($ scope.selectedItem)! == -1)? $ Scope Selected Items: Nil;

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