invoiceninja/app/ninja/repositories/CreditRepository.php

<?php namespace ninja\repositories;

use Credit;
use Client;
use Invoice;
use Utils;

class CreditRepository
{
	public function find($clientPublicId = null, $filter = null)
	{
	    $query = \DB::table('credits')
	                ->join('clients', 'clients.id', '=','credits.client_id')
	                ->join('contacts', 'contacts.client_id', '=', 'clients.id')
	                ->where('clients.account_id', '=', \Auth::user()->account_id)
	                ->where('clients.deleted_at', '=', null)
	                ->where('credits.deleted_at', '=', null)
	                ->where('contacts.is_primary', '=', true)   
	                ->select('credits.public_id', 'clients.name as client_name', 'clients.public_id as client_public_id', 'credits.amount', 'credits.credit_date', 'credits.currency_id', 'contacts.first_name', 'contacts.last_name', 'contacts.email');        

	    if ($clientPublicId) 
	    {
	        $query->where('clients.public_id', '=', $clientPublicId);
	    }

	    if ($filter)
	    {
	        $query->where(function($query) use ($filter)
	        {
	            $query->where('clients.name', 'like', '%'.$filter.'%');
	        });
	    }

	    return $query;
	}

	public function save($publicId = null, $input)
	{
        if ($publicId) 
        {
            $credit = Credit::scope($publicId)->firstOrFail();
        } 
        else 
        {
            $credit = Credit::createNew();
        }
        
        $credit->client_id = Client::getPrivateId($input['client']);
        $credit->credit_date = Utils::toSqlDate($input['credit_date']);
        $credit->invoice_id = isset($input['invoice']) && $input['invoice'] != "-1" ? Invoice::getPrivateId($input['invoice']) : null;
        $credit->amount = floatval($input['amount']);
        $credit->currency_id = $input['currency_id'] ? $input['currency_id'] : null;
        $credit->save();

        return $credit;
	}

	public function bulk($ids, $action)
	{
       	$credits = Credit::scope($ids)->get();

        foreach ($credits as $credit) 
        {
            if ($action == 'delete') 
            {
                $credit->is_deleted = true;
                $credit->save();
            } 
            
            $credit->delete();
        }

        return count($credits);
	}
}