[10.x] Get value attribute when default value is an enum (#48452)

* feat: get value attribute when default value is an enum

* Update Grammar.php

---------

Co-authored-by: Taylor Otwell <taylor@laravel.com>

Author: squiaios

src/Illuminate/Database/Schema/Grammars/Grammar.php

@@ -2,6 +2,7 @@
 
 namespace Illuminate\Database\Schema\Grammars;
 
+use BackedEnum;
 use Doctrine\DBAL\Schema\AbstractSchemaManager as SchemaManager;
 use Doctrine\DBAL\Schema\TableDiff;
 use Illuminate\Contracts\Database\Query\Expression;
@@ -309,6 +310,10 @@ protected function getDefaultValue($value)
             return $this->getValue($value);
         }
 
+        if ($value instanceof BackedEnum) {
+            return "'{$value->value}'";
+        }
+
         return is_bool($value)
                     ? "'".(int) $value."'"
                     : "'".(string) $value."'";

tests/Database/DatabaseMySqlSchemaGrammarTest.php

@@ -7,6 +7,7 @@
 use Illuminate\Database\Schema\Blueprint;
 use Illuminate\Database\Schema\ForeignIdColumnDefinition;
 use Illuminate\Database\Schema\Grammars\MySqlGrammar;
+use Illuminate\Tests\Database\Fixtures\Enums\Foo;
 use Mockery as m;
 use PHPUnit\Framework\TestCase;
 
@@ -623,6 +624,13 @@ public function testAddingString()
 
         $this->assertCount(1, $statements);
         $this->assertSame('alter table `users` add `foo` varchar(100) null default CURRENT TIMESTAMP', $statements[0]);
+
+        $blueprint = new Blueprint('users');
+        $blueprint->string('foo', 100)->nullable()->default(Foo::BAR);
+        $statements = $blueprint->toSql($this->getConnection(), $this->getGrammar());
+
+        $this->assertCount(1, $statements);
+        $this->assertSame('alter table `users` add `foo` varchar(100) null default \'bar\'', $statements[0]);
     }
 
     public function testAddingText()

tests/Database/Fixtures/Enums/Foo.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace Illuminate\Tests\Database\Fixtures\Enums;
+
+enum Foo: string
+{
+    case BAR = 'bar';
+}