diff --git a/chat/handler.py b/chat/handler.py
index 3df1977..b3c0ff6 100644
--- a/chat/handler.py
+++ b/chat/handler.py
@@ -7,10 +7,9 @@
 from auth.service import AuthService
 from flask import request
 from flask_socketio import Namespace, emit
-from pagination.pagination import int_to_sort
+from pagination.pagination import PaginationOptions
 from user.model import User
 from user.service import UserService
-from util.validate_request import validate_object
 from werkzeug.exceptions import NotFound, Unauthorized
 
 from chat.service import ChatHistoryPaginationOptions, ChatService
@@ -101,23 +100,9 @@ def on_chat_list(self, data):
         opts_dict["order_by"] = data["order_by"]
         opts_dict["from_user_id"] = int(user.id)
         opts_dict["to_user_id"] = int(data["to_user"])
-        if hasattr(data, "search"):
-            opts_dict["search"] = data["search"]
-
-        vobj = validate_object(ChatHistoryPaginationOptions, opts_dict)
-
-        opts = ChatHistoryPaginationOptions()
-        opts.page = int(vobj.page)
-        opts.limit = int(vobj.limit)
-        opts.sort = int_to_sort(int(vobj.sort))
-        opts.order_by = vobj.order_by
-        opts.from_user_id = int(vobj.from_user_id)
-        opts.to_user_id = int(vobj.to_user_id)
-        if hasattr(vobj, "search"):
-            opts.search = vobj.search
-        else:
-            opts.search = ""
+        opts_dict["search"] = data["search"] if hasattr(data, "search") else ""
 
+        opts = PaginationOptions.from_dict(opts_dict, ChatHistoryPaginationOptions)
         chat_history = ChatService.list_chat_history(opts)
 
         response = []
diff --git a/pagination/pagination.py b/pagination/pagination.py
index a3ff67f..a94f6d7 100644
--- a/pagination/pagination.py
+++ b/pagination/pagination.py
@@ -31,7 +31,7 @@ class PaginationOptions(Schema):
     sort = fields.Integer(required=True, validate=validate.Range(min=0, max=1))
     order_by = fields.String(required=True, validate=validate.Length(min=1, max=50))
     search = fields.String(
-        required=False, validate=validate.Length(min=1, max=50), default=""
+        required=False, validate=validate.Length(min=0, max=50), default=""
     )
 
     @classmethod