Laravel Autocomplete无法正常工作

Question

我使用以下代码实现了Laravel 5.1自动完成功能：

snippet js

<script type="text/javascript"> 
 $(document).ready(function () {
  $("#utente").autocomplete({
    minLength:3,
    autoFocus: true,
    source: '{{URL('utente')}}',
    select: function( event, ui ) {
        window.location.href = ui.item.url;
    },

});
});

</script>

这是我的路线：

Route::any('utente', function(){


 $term = Input::get('utente');
 // 4: check if any matches found in the database table 
 $data = DB::table("tb_users")->distinct()->where('last_name', 'LIKE', $term.'%')->groupBy('last_name')->get();
 foreach ($data as $v) {
 $nome = $v->last_name . ' ' . $v->first_name;
 $url = "clienti?utente=$v->id";
 $return_array[] = array('value' => $nome, 'label' => $nome, 'url' => $url);  }
  // if matches found it first create the array of the result and then convert it to json format so that 
  // it can be processed in the autocomplete script
 return Response::json($return_array);
 });

这是用于渲染自动完成的fiedl。

<input type="text" id="utente" name="utente" placeholder="Cognome e Nome" class="form-control-utente" ></input>

问题是，这会在DB中获取所有结果...而不是与查询匹配的结果