Rename Laravel Collection Keys: Modifying Pagination Results

Is there a way I can rename the data key in Laravel collection results from pagination? At the moment, when using methods like DB::table()->paginate(), the results automatically return a structure where the actual items are nested under the top-level data key. While this is convenient for basic database retrieval, often in API development or presentation layers, we need to rename these keys to match external expectations—for instance, changing "data" to "parties".

This is a very common requirement when building RESTful APIs or structuring data for front-end consumption. The good news is that because Laravel heavily leverages the powerful Eloquent ORM and its collection capabilities, renaming this structure is straightforward. The key is understanding where the data transformation needs to occur: it happens in your controller or service layer, after the query executes but before the response is sent to the client.

Understanding the Challenge with Pagination

When you execute a paginated query using the Query Builder, PHP receives a standard associative array structure containing metadata (like current_page, total, next_page_url) and the actual results wrapped in the data key.

For example, your initial result looks like this:

{
  "current_page": 1,
  "data": [ /* array of items */ ],
  // ... pagination metadata
}

You want to transform this into:

{
  "current_page": 1,
  "parties": [ /* array of items */ ],
  // ... pagination metadata
}

The challenge is that the standard paginate() method doesn't natively support renaming collection keys directly within the query itself. Therefore, we must intercept the result and manipulate the resulting collection object.

The Solution: Transforming the Collection

The most effective way to achieve this transformation is by accessing the underlying collection returned by the pagination method and manually restructuring it before returning it. This approach keeps your database query clean while giving you full control over the output format.

Here is a practical example demonstrating how to rename the data key to parties:

use Illuminate\Support\Facades\DB;

class ContractController extends Controller
{
    public function index()
    {
        $contracts = DB::table('contracts AS C')->paginate(1);

        // 1. Access the data collection
        $items = $contracts->data;

        // 2. Rename the key in the collection
        $renamedData = [
            'parties' => $items,
            // You can keep or modify other pagination keys as needed
            'current_page' => $contracts->current_page,
            'total' => $contracts->total,
            // ... include other necessary metadata
        ];

        // 3. Return the restructured data
        return response()->json($renamedData);
    }
}

Explanation of the Approach

1. Execute Pagination: We first run the standard pagination query using DB::table('contracts')->paginate(1). This gives us a standard Laravel Paginator object.
2. Extract Data: We access the actual results via $contracts->data. This is an instance of a standard PHP Collection.
3. Restructure Manually: We create a new associative array ($renamedData) where we manually assign the content of the original data key to our desired new key, parties. We also selectively copy other necessary pagination metadata.

This method is robust because it decouples the data retrieval (the database query) from the data presentation (the JSON response). This pattern is fundamental in building clean APIs, a principle strongly encouraged by the architecture of Laravel. For more complex data transformations, exploring tools like Eloquent Collections methods can further simplify this process.

Conclusion

Renaming collection keys in Laravel pagination results is not a feature built directly into the query builder but rather a matter of careful data orchestration in your application logic. By intercepting the result from paginate(), accessing the underlying collection, and manually restructuring the data before serialization, you gain complete control over the final JSON output. This practice ensures that your API responses are precisely tailored to the needs of your consuming clients, making your Laravel applications more flexible and maintainable.