暂存

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

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+<?php
+
+namespace Illuminate\Database\Eloquent\Relations\Concerns;
+
+use InvalidArgumentException;
+use UnitEnum;
+
+use function Illuminate\Support\enum_value;
+
+trait InteractsWithDictionary
+{
+    /**
+     * Get a dictionary key attribute - casting it to a string if necessary.
+     *
+     * @param  mixed  $attribute
+     * @return string|int|null
+     *
+     * @throws \InvalidArgumentException
+     */
+    protected function getDictionaryKey($attribute)
+    {
+        if (is_null($attribute) || is_string($attribute) || is_int($attribute)) {
+            return $attribute;
+        }
+
+        if (is_object($attribute)) {
+            if (method_exists($attribute, '__toString')) {
+                return $attribute->__toString();
+            }
+
+            if ($attribute instanceof UnitEnum) {
+                return enum_value($attribute);
+            }
+
+            throw new InvalidArgumentException('Model attribute value is an object but does not have a __toString method.');
+        }
+
+        return (string) $attribute;
+    }
+}