title: How to use display a custom value in Bootstrap-Vue Form-Select API?
body: <p>I plan to display a custom value in form-select of a <code>bootstrap-vue</code>. But it looks like the <code>options-field</code> attribute is not working as - the key to use from the options object to get the chance. <code>text-field</code> is used to display the certain label for every option.</p>
  <p>Having this example:</p>
  <pre><code>&lt;b-form-select 
      v-model=&quot;form.curriculum_subject&quot; 
      :options=&quot;curriculum_subjects&quot;
      options-field='item'
      :state=&quot;form.curriculum_subject_state&quot;
      text-field=&quot;item.subject.title&quot;
  &gt;
      &lt;template #first&gt;
          &lt;b-form-select-option :value=&quot;null&quot; disabled&gt;-- Please select an option --&lt;/b-form-select-option&gt;
      &lt;/template&gt;
  &lt;/b-form-select&gt;
  </code></pre>
  <p>Though, I'm not sure if I'm using it correctly.</p>