allow escaped commans in services requests

services.patch

diff --git a/sites/all/modules/services/services.module b/sites/all/modules/services/services.module
index 7f49837..97ba65a 100644
--- a/sites/all/modules/services/services.module
+++ b/sites/all/modules/services/services.module
@@ -476,9 +476,11 @@ function services_resource_build_index_query($schema, $order, $page, $fields, $s
   if (is_array($service_params)) {
     foreach ($service_params as $param_field => $param_value) {
       $in_placeholders = array();
-      foreach (explode(',', $param_value) as $single_value) {
+      // Split on unescaped commas.
+      foreach (preg_split('#(?<!\\\),#', $param_value) as $single_value) {
+        watchdog('services', "found param '$single_value'");
         $in_placeholders[] = db_type_placeholder($schema['fields'][$param_field]['type']);
-        $query_params[] = $single_value;
+        $query_params[] = str_replace('\\,', ',', $single_value);
       }
       $where[] = $primary_table . '.' . $param_field . ' IN (' . implode(',', $in_placeholders) . ')';
     }