project-manager/api/app/common/service/ContractService.php

<?php

namespace app\common\service;
use app\common\model\Contract;

class ContractService extends Service
{
    public function create($param = [])
    {
        $this->autoParams($param);

        return Contract::create($param);
    }

    public function update($param = [])
    {
        $this->autoParams($param);

        return Contract::update($param);
    }

    public function delete($param = [])
    {
        $this->autoParams($param);

        $contract = $this->one(Contract::class);

        return $contract->delete();
    }
}