buckets/app/Http/Resources/ProjectionResource.php

<?php

namespace App\Http\Resources;

use Illuminate\Http\Request;
use Illuminate\Http\Resources\Json\JsonResource;

class ProjectionResource extends JsonResource
{
    public function toArray(Request $request): array
    {
        return [
            'inflows' => InflowResource::collection($this->resource['inflows']),
            'outflows' => OutflowResource::collection($this->resource['outflows']),
            'draws' => DrawResource::collection($this->resource['draws']),
            'summary' => [
                'total_inflow' => $this->resource['inflows']->sum('amount_currency'),
                'total_outflow' => $this->resource['outflows']->sum('amount_currency'),
                'total_allocated' => $this->resource['draws']->sum('amount_currency'),
                'net_cashflow' => $this->resource['inflows']->sum('amount_currency') - $this->resource['outflows']->sum('amount_currency'),
            ],
        ];
    }
}