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vendor/illuminate/database/Eloquent/Relations/Concerns/InteractsWithDictionary.php

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+<?php
+
+namespace Illuminate\Database\Eloquent\Relations\Concerns;
+
+use BackedEnum;
+use Doctrine\Instantiator\Exception\InvalidArgumentException;
+use UnitEnum;
+
+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 UnitEnum) {
+                return $attribute instanceof BackedEnum ? $attribute->value : $attribute->name;
+            }
+
+            throw new InvalidArgumentException('Model attribute value is an object but does not have a __toString method.');
+        }
+
+        return $attribute;
+    }
+}