From ca430e6fa19ee703a4238cc8fe6f5aee91f57e7d Mon Sep 17 00:00:00 2001
From: Wendell Adriel <wendelladriel.ti@gmail.com>
Date: Mon, 4 Sep 2023 16:25:36 +0100
Subject: [PATCH] Add ability to cast array items with ArrayCast

---
 README.md                    | 14 ++++++++++++++
 src/Casting/ArrayCast.php    | 10 +++++++++-
 tests/Unit/ArrayCastTest.php | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 56 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index b74a866..f78590d 100644
--- a/README.md
+++ b/README.md
@@ -667,6 +667,20 @@ protected function casts(): array
 }
 ```
 
+If you want to cast all the elements inside the array, you can pass a `Castable` to the `ArrayCast`
+constructor. Let's say that you want to convert all the items inside the array into integers:
+
+```php
+protected function casts(): array
+{
+    return [
+        'property' => new ArrayCast(new IntegerCast()),
+    ];
+}
+```
+
+This works with all `Castable`, including `DTOCast` and `ModelCast` for nested data.
+
 ### Boolean
 
 For string values, this uses the `filter_var` function with the `FILTER_VALIDATE_BOOLEAN` flag.
diff --git a/src/Casting/ArrayCast.php b/src/Casting/ArrayCast.php
index 85bbb43..44f9dbb 100644
--- a/src/Casting/ArrayCast.php
+++ b/src/Casting/ArrayCast.php
@@ -6,6 +6,10 @@
 
 final class ArrayCast implements Castable
 {
+    public function __construct(private ?Castable $type = null)
+    {
+    }
+
     public function cast(string $property, mixed $value): array
     {
         if (is_string($value)) {
@@ -14,6 +18,10 @@ public function cast(string $property, mixed $value): array
             return is_array($jsonDecoded) ? $jsonDecoded : [$value];
         }
 
-        return is_array($value) ? $value : [$value];
+        $result = is_array($value) ? $value : [$value];
+
+        return blank($this->type)
+            ? $result
+            : array_map(fn ($item) => $this->type->cast($property, $item), $result);
     }
 }
diff --git a/tests/Unit/ArrayCastTest.php b/tests/Unit/ArrayCastTest.php
index 6f2b2f4..98762e0 100644
--- a/tests/Unit/ArrayCastTest.php
+++ b/tests/Unit/ArrayCastTest.php
@@ -3,6 +3,10 @@
 declare(strict_types=1);
 
 use WendellAdriel\ValidatedDTO\Casting\ArrayCast;
+use WendellAdriel\ValidatedDTO\Casting\BooleanCast;
+use WendellAdriel\ValidatedDTO\Casting\DTOCast;
+use WendellAdriel\ValidatedDTO\Casting\IntegerCast;
+use WendellAdriel\ValidatedDTO\Tests\Datasets\ValidatedDTOInstance;
 
 it('properly casts from json string to array')
     ->expect(fn () => new ArrayCast())
@@ -23,3 +27,32 @@
     ->expect(fn () => new ArrayCast())
     ->cast(test_property(), ['a', 'A', 1])
     ->toBe(['a', 'A', 1]);
+
+it('properly casts a BooleanCast to array')
+    ->expect(fn () => new ArrayCast(new BooleanCast()))
+    ->cast(test_property(), [1, 'true', 'yes'])
+    ->toBe([true, true, true]);
+
+it('properly casts an IntegerCast to array')
+    ->expect(fn () => new ArrayCast(new IntegerCast()))
+    ->cast(test_property(), ['1', '5', '10'])
+    ->toBe([1, 5, 10]);
+
+it('properly casts an DTOCast', function () {
+    $castable = new ArrayCast(new DTOCast(ValidatedDTOInstance::class));
+
+    $johnDto = new ValidatedDTOInstance(['name' => 'John Doe', 'age' => 30]);
+    $maryDto = new ValidatedDTOInstance(['name' => 'Mary Doe', 'age' => 25]);
+
+    $dataToCast = [
+        ['name' => 'John Doe', 'age' => 30],
+        ['name' => 'Mary Doe', 'age' => 25],
+    ];
+
+    $result = $castable->cast(test_property(), $dataToCast);
+
+    expect($result)->each->toBeInstanceOf(ValidatedDTOInstance::class);
+
+    expect($result[0]->toArray())->toEqual($johnDto->toArray())
+        ->and($result[1]->toArray())->toEqual($maryDto->toArray());
+});