Updated API code.

app/Repositories/RuleGroup/RuleGroupRepository.php

@@ -388,4 +388,19 @@ class RuleGroupRepository implements RuleGroupRepositoryInterface
             $group->delete();
         }
     }
+
+    /**
+     * @inheritDoc
+     */
+    public function searchRuleGroup(string $query, int $limit): Collection
+    {
+        $search = $this->user->ruleGroups();
+        if ('' !== $query) {
+            $search->where('rule_groups.title', 'LIKE', sprintf('%%%s%%', $query));
+        }
+        $search->orderBy('rule_groups.order', 'ASC')
+               ->orderBy('rule_groups.title', 'ASC');
+
+        return $search->take($limit)->get(['id','title','description']);
+    }
 }

app/Repositories/RuleGroup/RuleGroupRepositoryInterface.php

@@ -36,6 +36,14 @@ interface RuleGroupRepositoryInterface
      */
     public function destroyAll(): void;
 
+    /**
+     * @param string $query
+     * @param int    $limit
+     *
+     * @return Collection
+     */
+    public function searchRuleGroup(string $query, int $limit): Collection;
+
     /**
      * @return int
      */
@@ -155,7 +163,7 @@ interface RuleGroupRepositoryInterface
 
     /**
      * @param RuleGroup $ruleGroup
-     * @param array $data
+     * @param array     $data
      *
      * @return RuleGroup
      */