CollectionOfCaster

README.md

@@ -16,6 +16,17 @@ composer require "fab2s/laravel-dt0"
 
 `Laravel Dt0` only adds Validation implementation and model attribute casting to `Dt0`. All other features will work exactly the same. Have a look at  [`Dt0`](https://github.com/fab2s/dt0) to find out more.
 
+## Caster
+
+In addition to [`Dt0 casters`](https://github.com/fab2s/dt0/tree/main/src/docs/casters.md), `Laravel Dt0` adds a [`CollectionOfCaster`](./src/Caster/CollectionOfCaster.php) which can be used to strongly type a Laravel `Collection`:
+
+````php
+    #[Cast(in: new CollectionOfCaster(MyDt0::class))] // Dt0|UnitEnum|ScalarType|string
+    public readonly Collection $prop;
+````
+
+It can be used as an inspiration to cast into more types.
+
 ## Validation
 
 `Laravel Dt0` is able to leverage the full power of Laravel validation on each of its public properties. The validation is performed on the input data prior to any property casting or instantiation.

composer.json

@@ -29,7 +29,7 @@
     ],
     "require": {
         "php": "^8.1",
-        "fab2s/dt0": "dev-main",
+        "fab2s/dt0": "v0.x-dev",
         "illuminate/translation": "^10.0|^11.0",
         "illuminate/validation": "^10.0|^11.0"
     },

src/Caster/CollectionOfCaster.php

@@ -15,8 +15,10 @@
 use fab2s\Dt0\Caster\ScalarType;
 use fab2s\Dt0\Dt0;
 use fab2s\Dt0\Exception\CasterException;
+use fab2s\Dt0\Exception\Dt0Exception;
 use fab2s\Dt0\Property\Property;
 use Illuminate\Support\Collection;
+use JsonException;
 
 class CollectionOfCaster implements CasterInterface
 {
@@ -41,13 +43,17 @@ public function __construct(
         }
 
         if (! $logicalType) {
-            throw new CasterException('[' . Dt0::classBasename(static::class) . "] $type is not an ArrayType nor a ScalarType");
+            throw new CasterException('[' . Dt0::classBasename(static::class) . "] $type is not a supported type");
         }
 
         $this->logicalType  = $logicalType;
         $this->scalarCaster = $this->logicalType instanceof ScalarType ? new ScalarCaster($this->logicalType) : null;
     }
 
+    /**
+     * @throws Dt0Exception
+     * @throws JsonException
+     */
     public function cast(mixed $value): ?Collection
     {
         if (! is_iterable($value)) {
@@ -58,9 +64,11 @@ public function cast(mixed $value): ?Collection
 
         foreach ($value as $item) {
             $result->push(match ($this->logicalType) {
-                ArrayType::DT0  => $this->type::tryFrom($item),
-                ArrayType::ENUM => Property::tryEnum($this->type, $item),
-                default         => $this->scalarCaster->cast($item),
+                ArrayType::DT0  => $this->type::from($item),
+                ArrayType::ENUM => Property::enumFrom($this->type, $item),
+                default         => $this->scalarCaster->cast($item) ?? throw (new CasterException('Could not cast array item to scalar type ' . $this->logicalType->value))->setContext([
+                    'item' => $item,
+                ]),
             });
         }
 

tests/Caster/CollectionOfCasterTest.php

@@ -12,6 +12,7 @@
 use Exception;
 use fab2s\Dt0\Caster\ScalarType;
 use fab2s\Dt0\Exception\CasterException;
+use fab2s\Dt0\Exception\Dt0Exception;
 use fab2s\Dt0\Laravel\Caster\CollectionOfCaster;
 use fab2s\Dt0\Laravel\Tests\Artifacts\DumbDt0;
 use fab2s\Dt0\Laravel\Tests\TestCase;
@@ -37,6 +38,13 @@ public function test_exception(): void
         new CollectionOfCaster('NotAType');
     }
 
+    public function test_scalar_exception(): void
+    {
+        $this->expectException(Dt0Exception::class);
+        $caster = new CollectionOfCaster(ScalarType::bool);
+        $caster->cast([[]]);
+    }
+
     public static function castProvider(): array
     {
         return [