laravel - How do you use setColumnAttribute with update()? -

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I am attempting to strip non-numeric characters on an attribute before saving, but the new value is not saved is.

My model looks like this: 

  class model extends \ supernatural {public function set column attribute ($ value) {$ value = (int) preg_replace (' / [^ 0-9] / ',' ', $ Value); $ Return; }}   
 If I add a  dd ($ value)  to it, then that method needs to be run, it is a dump.  
 I update the model:  
  Model :: search ($ id) - & gt; Update ($ attributes);   
 Why does not this save the value given by the  setColumnAttribute  method? What am I missing?   
 
 
  searching on a lucrative mutator  I got it back to the value Instead of  $ this- & gt; Attributes were included in the array.  
  Extended in class model \ Supernatural {Public function set column attribute ($ value) {$ Value = (int) preg_replace ('/ [^ 0-9] /', '', $ value ); $ This- & gt; Attribute ['column'] = $ value; }}

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