Add cursor-based pagination for messages

README.md

@@ -39,6 +39,7 @@ Create a Chat application for your multiple Models
   - [Remove participants from a conversation](#remove-participants-from-a-conversation)
   - [Add participants to a conversation](#add-participants-to-a-conversation)
   - [Get messages in a conversation](#get-messages-in-a-conversation)
+  - [Get messages with cursor pagination](#get-messages-with-cursor-pagination)
   - [Get public conversations for discovery](#get-public-conversations-for-discovery)
   - [Get recent messages](#get-recent-messages)
   - [Get participants in a conversation](#get-participants-in-a-conversation)
@@ -322,6 +323,44 @@ Chat::conversation($conversation)->addParticipants([$participantModel, $particip
 Chat::conversation($conversation)->setParticipant($participantModel)->getMessages()
 ```
 
+#### Get messages with cursor pagination
+
+For real-time chat applications, cursor-based pagination is recommended over offset-based pagination. This prevents duplicate messages when new messages arrive between page loads.
+
+```php
+// Get first page
+$messages = Chat::conversation($conversation)
+    ->setParticipant($participantModel)
+    ->setCursorPaginationParams([
+        'perPage' => 25,
+        'sorting' => 'asc',
+    ])
+    ->getMessagesWithCursor();
+
+// Get next page using cursor from previous response
+$nextCursor = $messages->nextCursor()?->encode();
+
+$moreMessages = Chat::conversation($conversation)
+    ->setParticipant($participantModel)
+    ->setCursorPaginationParams([
+        'perPage' => 25,
+        'sorting' => 'asc',
+        'cursor' => $nextCursor,
+    ])
+    ->getMessagesWithCursor();
+```
+
+**API Endpoint:** `GET /conversations/{id}/messages-cursor`
+
+Query parameters:
+- `participant_id` (required)
+- `participant_type` (required)
+- `perPage` (optional, default: 25)
+- `sorting` (optional: `asc` or `desc`)
+- `cursor` (optional - from previous response's `next_cursor`)
+
+The response includes `next_cursor` and `prev_cursor` for navigation.
+
 #### Get user conversations by type
 
 ```php
@@ -380,6 +419,8 @@ You don't have to specify all the parameters. If you leave the parameters out, d
 `$paginated` above will return `Illuminate\Pagination\LengthAwarePaginator`
 To get the `conversations` simply call `$paginated->items()`
 
+> **Tip:** For paginating messages in real-time chat applications, consider using [cursor pagination](#get-messages-with-cursor-pagination) instead. Cursor pagination prevents duplicate messages when new messages arrive between page loads.
+
 
 #### Get participants in a conversation
 

src/Http/Controllers/ConversationMessageController.php

@@ -6,6 +6,7 @@
 use Musonza\Chat\Http\Requests\ClearConversation;
 use Musonza\Chat\Http\Requests\DeleteMessage;
 use Musonza\Chat\Http\Requests\GetParticipantMessages;
+use Musonza\Chat\Http\Requests\GetParticipantMessagesWithCursor;
 use Musonza\Chat\Http\Requests\StoreMessage;
 
 class ConversationMessageController extends Controller
@@ -48,6 +49,27 @@ public function index(GetParticipantMessages $request, $conversationId)
         return response($message);
     }
 
+    /**
+     * Get messages using cursor-based pagination.
+     *
+     * Cursor pagination is more suitable for real-time chat applications
+     * as it avoids duplicate messages when new messages arrive between page loads.
+     */
+    public function indexWithCursor(GetParticipantMessagesWithCursor $request, $conversationId)
+    {
+        $conversation = Chat::conversations()->getById($conversationId);
+        $messages     = Chat::conversation($conversation)
+            ->setParticipant($request->getParticipant())
+            ->setCursorPaginationParams($request->getCursorPaginationParams())
+            ->getMessagesWithCursor();
+
+        if ($this->messageTransformer) {
+            return fractal($messages, $this->messageTransformer)->respond();
+        }
+
+        return response($messages);
+    }
+
     public function show(GetParticipantMessages $request, $conversationId, $messageId)
     {
         $message = Chat::messages()->getById($messageId);

src/Http/Requests/GetParticipantMessagesWithCursor.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace Musonza\Chat\Http\Requests;
+
+use Musonza\Chat\ValueObjects\Pagination;
+
+class GetParticipantMessagesWithCursor extends BaseRequest
+{
+    /**
+     * @var Pagination
+     */
+    private $pagination;
+
+    public function __construct(Pagination $pagination)
+    {
+        parent::__construct();
+        $this->pagination = $pagination;
+    }
+
+    public function authorized()
+    {
+        return true;
+    }
+
+    public function rules()
+    {
+        return [
+            'participant_id'   => 'required',
+            'participant_type' => 'required',
+            'perPage'          => 'integer',
+            'sorting'          => 'string|in:asc,desc',
+            'columns'          => 'array',
+            'cursor'           => 'string|nullable',
+            'cursorName'       => 'string',
+        ];
+    }
+
+    public function getCursorPaginationParams()
+    {
+        return [
+            'perPage'    => $this->perPage    ?? $this->pagination->getPerPage(),
+            'sorting'    => $this->sorting    ?? $this->pagination->getSorting(),
+            'columns'    => $this->columns    ?? $this->pagination->getColumns(),
+            'cursor'     => $this->cursor     ?? null,
+            'cursorName' => $this->cursorName ?? 'cursor',
+        ];
+    }
+}

src/Http/routes.php

@@ -32,6 +32,8 @@
         ->name('conversations.messages.store');
     Route::get('/conversations/{id}/messages', 'ConversationMessageController@index')
         ->name('conversations.messages.index');
+    Route::get('/conversations/{id}/messages-cursor', 'ConversationMessageController@indexWithCursor')
+        ->name('conversations.messages.index.cursor');
     Route::get('/conversations/{id}/messages/{message_id}', 'ConversationMessageController@show')
         ->name('conversations.messages.show');
     Route::delete('/conversations/{id}/messages', 'ConversationMessageController@deleteAll')

src/Models/Conversation.php

@@ -3,6 +3,7 @@
 namespace Musonza\Chat\Models;
 
 use Chat;
+use Illuminate\Contracts\Pagination\CursorPaginator;
 use Illuminate\Contracts\Pagination\LengthAwarePaginator;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\HasMany;
@@ -89,6 +90,21 @@ public function getMessages(Model $participant, $paginationParams, $deleted = fa
         return $this->getConversationMessages($participant, $paginationParams, $deleted);
     }
 
+    /**
+     * Get messages for a conversation using cursor-based pagination.
+     *
+     * Cursor pagination is more suitable for real-time chat applications
+     * as it avoids duplicate messages when new messages arrive between page loads.
+     *
+     * @param  array  $paginationParams
+     * @param  bool  $deleted
+     * @return CursorPaginator
+     */
+    public function getMessagesWithCursor(Model $participant, $paginationParams, $deleted = false)
+    {
+        return $this->getConversationMessagesWithCursor($participant, $paginationParams, $deleted);
+    }
+
     public function getParticipantConversations($participant, array $options)
     {
         return $this->getConversationsList($participant, $options);
@@ -324,6 +340,37 @@ private function getConversationMessages(Model $participant, $paginationParams,
         return $messages;
     }
 
+    /**
+     * Get messages in conversation using cursor-based pagination.
+     *
+     * @return CursorPaginator
+     */
+    private function getConversationMessagesWithCursor(Model $participant, $paginationParams, $deleted)
+    {
+        $messages = $this->messages()
+            ->join($this->tablePrefix . 'message_notifications', $this->tablePrefix . 'message_notifications.message_id', '=', $this->tablePrefix . 'messages.id')
+            ->where($this->tablePrefix . 'message_notifications.messageable_type', $participant->getMorphClass())
+            ->where($this->tablePrefix . 'message_notifications.messageable_id', $participant->getKey());
+        $messages = $deleted ? $messages->whereNotNull($this->tablePrefix . 'message_notifications.deleted_at') : $messages->whereNull($this->tablePrefix . 'message_notifications.deleted_at');
+        $messages = $messages->orderBy($this->tablePrefix . 'messages.id', $paginationParams['sorting'])
+            ->cursorPaginate(
+                $paginationParams['perPage'],
+                [
+                    $this->tablePrefix . 'message_notifications.updated_at as read_at',
+                    $this->tablePrefix . 'message_notifications.deleted_at as deleted_at',
+                    $this->tablePrefix . 'message_notifications.messageable_id',
+                    $this->tablePrefix . 'message_notifications.id as notification_id',
+                    $this->tablePrefix . 'message_notifications.is_seen',
+                    $this->tablePrefix . 'message_notifications.is_sender',
+                    $this->tablePrefix . 'messages.*',
+                ],
+                $paginationParams['cursorName'] ?? 'cursor',
+                $paginationParams['cursor']     ?? null
+            );
+
+        return $messages;
+    }
+
     /**
      * @return mixed
      */

src/Services/ConversationService.php

@@ -58,6 +58,19 @@ public function getMessages()
         return $this->conversation->getMessages($this->participant, $this->getPaginationParams(), $this->deleted);
     }
 
+    /**
+     * Get messages in a conversation using cursor-based pagination.
+     *
+     * Cursor pagination is more suitable for real-time chat applications
+     * as it avoids duplicate messages when new messages arrive between page loads.
+     *
+     * @return \Illuminate\Contracts\Pagination\CursorPaginator
+     */
+    public function getMessagesWithCursor()
+    {
+        return $this->conversation->getMessagesWithCursor($this->participant, $this->getCursorPaginationParams(), $this->deleted);
+    }
+
     /**
      * Clears conversation.
      */

src/Traits/Paginates.php

@@ -16,6 +16,10 @@ trait Paginates
 
     protected $deleted = false;
 
+    protected $cursor = null;
+
+    protected $cursorName = 'cursor';
+
     /**
      * Set the limit.
      *
@@ -75,4 +79,44 @@ public function getPaginationParams()
             'pageName' => $this->pageName,
         ];
     }
+
+    public function getCursorPaginationParams()
+    {
+        return [
+            'perPage'    => $this->perPage,
+            'sorting'    => $this->sorting,
+            'columns'    => $this->columns,
+            'cursor'     => $this->cursor,
+            'cursorName' => $this->cursorName,
+        ];
+    }
+
+    /**
+     * Set the cursor for cursor-based pagination.
+     *
+     * @param  string|null  $cursor
+     * @return $this
+     */
+    public function cursor($cursor)
+    {
+        $this->cursor = $cursor;
+
+        return $this;
+    }
+
+    /**
+     * Set cursor pagination parameters.
+     *
+     * @return $this
+     */
+    public function setCursorPaginationParams($params)
+    {
+        foreach ($params as $key => $value) {
+            if (property_exists($this, $key)) {
+                $this->{$key} = $value;
+            }
+        }
+
+        return $this;
+    }
 }