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vendor/illuminate/database/Eloquent/Casts/AsCollection.php

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+<?php
+
+namespace Illuminate\Database\Eloquent\Casts;
+
+use Illuminate\Contracts\Database\Eloquent\Castable;
+use Illuminate\Contracts\Database\Eloquent\CastsAttributes;
+use Illuminate\Support\Collection;
+use InvalidArgumentException;
+
+class AsCollection implements Castable
+{
+    /**
+     * Get the caster class to use when casting from / to this cast target.
+     *
+     * @param  array  $arguments
+     * @return \Illuminate\Contracts\Database\Eloquent\CastsAttributes<\Illuminate\Support\Collection<array-key, mixed>, iterable>
+     */
+    public static function castUsing(array $arguments)
+    {
+        return new class($arguments) implements CastsAttributes
+        {
+            public function __construct(protected array $arguments)
+            {
+            }
+
+            public function get($model, $key, $value, $attributes)
+            {
+                if (! isset($attributes[$key])) {
+                    return;
+                }
+
+                $data = Json::decode($attributes[$key]);
+
+                $collectionClass = $this->arguments[0] ?? Collection::class;
+
+                if (! is_a($collectionClass, Collection::class, true)) {
+                    throw new InvalidArgumentException('The provided class must extend ['.Collection::class.'].');
+                }
+
+                return is_array($data) ? new $collectionClass($data) : null;
+            }
+
+            public function set($model, $key, $value, $attributes)
+            {
+                return [$key => Json::encode($value)];
+            }
+        };
+    }
+
+    /**
+     * Specify the collection for the cast.
+     *
+     * @param  class-string  $class
+     * @return string
+     */
+    public static function using($class)
+    {
+        return static::class.':'.$class;
+    }
+}