invoiceninja/app/Ninja/Transformers/ExpenseTransformer.php

<?php namespace App\Ninja\Transformers;

use App\Models\Expense;

class ExpenseTransformer extends EntityTransformer
{
    public function __construct($account = null, $serializer = null, $client = null)
    {
        parent::__construct($account, $serializer);

        $this->client = $client;
    }

    public function transform(Expense $expense)
    {
        return array_merge($this->getDefaults($expense), [
            'id' => (int) $expense->public_id,
            'private_notes' => $expense->private_notes,
            'public_notes' => $expense->public_notes,
            'should_be_invoiced' => (bool) $expense->should_be_invoiced,
            'updated_at' => $this->getTimestamp($expense->updated_at),
            'archived_at' => $this->getTimestamp($expense->deleted_at),
            'transaction_id' => $expense->transaction_id,
            'bank_id' => $expense->bank_id,
            'expense_currency_id' => (int) $expense->expense_currency_id,
            'expense_category_id' => $expense->expense_category ? (int) $expense->expense_category->public_id : null,
            'amount' => (float) $expense->amount,
            'expense_date' => $expense->expense_date,
            'exchange_rate' => (float) $expense->exchange_rate,
            'invoice_currency_id' => (int) $expense->invoice_currency_id,
            'is_deleted' => (bool) $expense->is_deleted,
            'tax_name1' => $expense->tax_name1,
            'tax_name2' => $expense->tax_name2,
            'tax_rate1' => $expense->tax_rate1,
            'tax_rate2' => $expense->tax_rate2,
            'client_id' => $this->client ? $this->client->public_id : (isset($expense->client->public_id) ? (int) $expense->client->public_id : null),
            'invoice_id' => isset($expense->invoice->public_id) ? (int) $expense->invoice->public_id : null,
            'vendor_id' => isset($expense->vendor->public_id) ? (int) $expense->vendor->public_id : null,
        ]);
    }
}