ars_GetFieldByName(control,schema,field_name)
      This is a shortcut function that combine ars_GetListField and
      ars_GetField.  Given a schema name and field name, it returns
      the field id.  If you need more than a few field id's, use
      ars_GetFieldTable. 
      
          - On success
- 
              Returns the field id.
          
- On failure
- 
              Returns undef.
Example:
      
    
      $id = ars_GetFieldByName($c, "User", "Login name");
      
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