fixed Contact ref and entity ref

CRM/ConstituentsOnly/BAO/APIWrapper.php

@@ -0,0 +1,23 @@
+<?php
+
+class CRM_ConstituentsOnly_BAO_APIWrapper implements API_Wrapper {
+  /**
+   * the wrapper contains a method that allows you to alter the parameters of the api request (including the action and the entity)
+   */
+  public function fromApiInput($apiRequest) {
+    $params = &$apiRequest['params'];
+
+    if (!array_key_exists('do_not_trade', $params['params'])) {
+      $params['params']['do_not_trade'] = '0 AND (contact_a.do_not_trade IS NULL OR contact_a.do_not_trade = 0)';
+    }
+    return $apiRequest;
+  }
+
+  /**
+   * alter the result before returning it to the caller.
+   */
+  public function toApiOutput($apiRequest, $result) {
+    return $result;
+  }
+
+}