Creating an install data script (InstallData.php)

An install data script is what gets run immediately after upgrade schema. We define install data schema within the app/code/Foggyline/Office/Setup/InstallData.php file with (partial) content as follows:

namespace Foggyline\Office\Setup;

use Magento\Framework\Setup\InstallDataInterface;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;

class InstallData implements InstallDataInterface
{
    private $employeeSetupFactory;

    public function __construct(
        \Foggyline\Office\Setup\EmployeeSetupFactory $employeeSetupFactory
    )
    {
        $this->employeeSetupFactory = $employeeSetupFactory;
    }

    public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
    {
        $setup->startSetup();
        /* #snippet1 */
        $setup->endSetup();
    }
}

InstallData conforms to InstallDataInterface, which requires the implementation of the...