title: ACF: search by relationship field
body: <p>I have used ACF relationship fields. the field name is <code>international_mins_category_a_countries</code> . The field is having multiple values.</p>
  
  <p>If I print it(<code>(get_field("international_mins_category_a_countries", get_the_ID())</code>) prints an array -</p>
  
  <pre><code>array
  (
      [0] =&gt; 737
      [1] =&gt; 734
      [2] =&gt; 723
      [3] =&gt; 1484
  }
  </code></pre>
  
  <p>now I am trying to search/filter the posts with a value say <code>737</code>.</p>
  
  <p>But I am not getting any result.</p>
  
  <pre><code>Code I have used to filter that is ---
  
  'meta_query'    =&gt;  array(
              array(
                  'key'       =&gt;  'international_mins_category_a_countries',
                  'value'     =&gt;  '737',
                  'compare'   =&gt;  'IN',
              ),
          )
  </code></pre>
  
  <p>But no result. Can anyone help ?</p>