Validator store detail

var recordIndex = DepartmentMemberStore.findBy(
    function(record, id){
        if(record.get('date') === date_from_form && 
           record.get('time') === time_from_form &&
           record.get('type') === type_from_form){
              return true;  // a record with this data exists
        }
        return false;  // there is no record in the store with this data
    }
);

if(recordIndex != -1){
    alert("We have a duplicate, abort!");
}
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