title: Dust helper equal for select control
body: <p>I have this template i need select proper selected option, how to compare it with dust helpers? <a href="https://stackoverflow.com/a/19628029/880709">https://stackoverflow.com/a/19628029/880709</a> didn't work for me</p>
  
  <pre><code>{#data.PRODUCT_TURNOVER_DATA}
  &lt;tr&gt;
      &lt;td&gt;&lt;input name="ID_TYPE_TURN" value='{.ID_TYPE_TURN}'&gt;&lt;/td&gt;
      &lt;td&gt;
  
                          &lt;div class="form-group"&gt;
                              &lt;select class="form-control" name="ID_TYPE_TURN"&gt;
                              {#data.SPR_TYPE_TURN_DATA}
                                  &lt;option value="{.ID_TYPE_TURN}" selected='?'&gt;{.NAME_TYPE_TURN}&lt;/option&gt;
                              {/data.SPR_TYPE_TURN_DATA}
                              &lt;/select&gt;
                          &lt;/div&gt;
      &lt;/td&gt;
  &lt;/tr&gt;
  {/data.PRODUCT_TURNOVER_DATA}
  </code></pre>
  
  <p>Data:</p>
  
  <pre><code>"data": {
        "PRODUCT_TURNOVER_DATA": [
          {
            "ID_PRODUCT_TURNOVER": 4,
            "DATE_TURN": "2015-12-29T21:00:00.000Z",
            "ID_TYPE_TURN": 2,
  
          }
        ],
       "SPR_TYPE_TURN_DATA": [
          {
            "ID_TYPE_TURN": 1,
            "NAME_TYPE_TURN": "Передано в составе УТАС",
            "ACC_OPT": 1
          },
          {
            "ID_TYPE_TURN": 2,
            "NAME_TYPE_TURN": "Получено от контрагента для ревизии",
            "ACC_OPT": -1
          }]
  </code></pre>
  
  <p>Criteria of equality</p>
  
  <pre><code>PRODUCT_TURNOVER_DATA.ID_TYPE_TURN == SPR_TYPE_TURN_DATA.ID_TYPE_TURN 
  </code></pre>