<?php

namespace IAWPSCOPED\Illuminate\Database\Eloquent\Relations\Concerns;

use BackedEnum;
use IAWPSCOPED\Doctrine\Instantiator\Exception\InvalidArgumentException;
/** @internal */
trait InteractsWithDictionary
{
    /**
     * Get a dictionary key attribute - casting it to a string if necessary.
     *
     * @param  mixed  $attribute
     * @return mixed
     *
     * @throws \Doctrine\Instantiator\Exception\InvalidArgumentException
     */
    protected function getDictionaryKey($attribute)
    {
        if (\is_object($attribute)) {
            if (\method_exists($attribute, '__toString')) {
                return $attribute->__toString();
            }
            if (\function_exists('enum_exists') && $attribute instanceof BackedEnum) {
                return $attribute->value;
            }
            throw new InvalidArgumentException('Model attribute value is an object but does not have a __toString method.');
        }
        return $attribute;
    }
}
