[8.x] Custom cast string into Stringable (#39410)

* custom cast string to stringable

* fix ci style

* styleci

src/Illuminate/Database/Eloquent/Casts/AsStringable.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Illuminate\Database\Eloquent\Casts;
+
+use Illuminate\Contracts\Database\Eloquent\Castable;
+use Illuminate\Contracts\Database\Eloquent\CastsAttributes;
+use Illuminate\Support\Str;
+
+class AsStringable implements Castable
+{
+    /**
+     * Get the caster class to use when casting from / to this cast target.
+     *
+     * @param  array  $arguments
+     * @return object|string
+     */
+    public static function castUsing(array $arguments)
+    {
+        return new class implements CastsAttributes
+        {
+            public function get($model, $key, $value, $attributes)
+            {
+                return isset($value) ? Str::of($value) : null;
+            }
+
+            public function set($model, $key, $value, $attributes)
+            {
+                return isset($value) ? (string) $value : null;
+            }
+        };
+    }
+}

tests/Database/DatabaseEloquentModelTest.php

@@ -16,6 +16,7 @@
 use Illuminate\Database\Eloquent\Casts\ArrayObject;
 use Illuminate\Database\Eloquent\Casts\AsArrayObject;
 use Illuminate\Database\Eloquent\Casts\AsCollection;
+use Illuminate\Database\Eloquent\Casts\AsStringable;
 use Illuminate\Database\Eloquent\Collection;
 use Illuminate\Database\Eloquent\JsonEncodingException;
 use Illuminate\Database\Eloquent\MassAssignmentException;
@@ -28,6 +29,8 @@
 use Illuminate\Support\Carbon;
 use Illuminate\Support\Collection as BaseCollection;
 use Illuminate\Support\InteractsWithTime;
+use Illuminate\Support\Str;
+use Illuminate\Support\Stringable;
 use InvalidArgumentException;
 use LogicException;
 use Mockery as m;
@@ -194,6 +197,24 @@ public function testDirtyOnCastedCollection()
         $this->assertTrue($model->isDirty('ascollectionAttribute'));
     }
 
+    public function testDirtyOnCastedStringable()
+    {
+        $model = new EloquentModelCastingStub;
+        $model->setRawAttributes([
+            'asStringableAttribute' => 'foo bar',
+        ]);
+        $model->syncOriginal();
+
+        $this->assertInstanceOf(Stringable::class, $model->asStringableAttribute);
+        $this->assertFalse($model->isDirty('asStringableAttribute'));
+
+        $model->asStringableAttribute = Str::of('foo bar');
+        $this->assertFalse($model->isDirty('asStringableAttribute'));
+
+        $model->asStringableAttribute = Str::of('foo baz');
+        $this->assertTrue($model->isDirty('asStringableAttribute'));
+    }
+
     public function testCleanAttributes()
     {
         $model = new EloquentModelStub(['foo' => '1', 'bar' => 2, 'baz' => 3]);
@@ -2611,6 +2632,7 @@ class EloquentModelCastingStub extends Model
         'timestampAttribute' => 'timestamp',
         'asarrayobjectAttribute' => AsArrayObject::class,
         'ascollectionAttribute' => AsCollection::class,
+        'asStringableAttribute' => AsStringable::class,
     ];
 
     public function jsonAttributeValue()

tests/Integration/Database/DatabaseArrayObjectAndCollectionCustomCastTest.php → tests/Integration/Database/DatabaseCustomCastsTest.php

@@ -4,37 +4,45 @@
 
 use Illuminate\Database\Eloquent\Casts\AsArrayObject;
 use Illuminate\Database\Eloquent\Casts\AsCollection;
+use Illuminate\Database\Eloquent\Casts\AsStringable;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Schema\Blueprint;
 use Illuminate\Support\Facades\Schema;
+use Illuminate\Support\Str;
 
-class DatabaseArrayObjectAndCollectionCustomCastTest extends DatabaseTestCase
+/**
+ * @group integration
+ */
+class DatabaseCustomCastsTest extends DatabaseTestCase
 {
     protected function setUp(): void
     {
         parent::setUp();
 
-        Schema::create('test_eloquent_model_with_custom_array_object_casts', function (Blueprint $table) {
+        Schema::create('test_eloquent_model_with_custom_casts', function (Blueprint $table) {
             $table->increments('id');
             $table->text('array_object');
             $table->text('collection');
+            $table->string('stringable');
             $table->timestamps();
         });
     }
 
-    public function test_array_object_and_collection_casting()
+    public function test_custom_casting()
     {
-        $model = new TestEloquentModelWithCustomArrayObjectCast;
+        $model = new TestEloquentModelWithCustomCasts;
 
         $model->array_object = ['name' => 'Taylor'];
         $model->collection = collect(['name' => 'Taylor']);
+        $model->stringable = Str::of('Taylor');
 
         $model->save();
 
         $model = $model->fresh();
 
         $this->assertEquals(['name' => 'Taylor'], $model->array_object->toArray());
         $this->assertEquals(['name' => 'Taylor'], $model->collection->toArray());
+        $this->assertEquals('Taylor', (string) $model->stringable);
 
         $model->array_object['age'] = 34;
         $model->array_object['meta']['title'] = 'Developer';
@@ -51,7 +59,7 @@ public function test_array_object_and_collection_casting()
     }
 }
 
-class TestEloquentModelWithCustomArrayObjectCast extends Model
+class TestEloquentModelWithCustomCasts extends Model
 {
     /**
      * The attributes that aren't mass assignable.
@@ -68,5 +76,6 @@ class TestEloquentModelWithCustomArrayObjectCast extends Model
     protected $casts = [
         'array_object' => AsArrayObject::class,
         'collection' => AsCollection::class,
+        'stringable' => AsStringable::class,
     ];
 }