Allow id to be set/get using magic methods

This allows you to set/get the id just like any other attribute. This is useful for example if you want to pluck all ids of a collection of items.

src/Item.php

@@ -15,6 +15,9 @@
 use Swis\JsonApi\Client\Traits\HasMeta;
 use Swis\JsonApi\Client\Traits\HasType;
 
+/**
+ * @property string|null id
+ */
 class Item extends Model implements ItemInterface
 {
     use HasLinks;
@@ -219,6 +222,20 @@ public function canBeIncluded(): bool
         return true;
     }
 
+    /**
+     * @param string $key
+     *
+     * @return mixed
+     */
+    public function __get($key)
+    {
+        if ($key === 'id') {
+            return $this->getId();
+        }
+
+        return parent::__get($key);
+    }
+
     /**
      * @param string $key
      *
@@ -243,6 +260,21 @@ public function hasAttribute($key): bool
         return array_key_exists($key, $this->attributes);
     }
 
+    /**
+     * @param string $key
+     * @param mixed  $value
+     */
+    public function __set($key, $value)
+    {
+        if ($key === 'id') {
+            $this->setId($value);
+
+            return;
+        }
+
+        parent::__set($key, $value);
+    }
+
     /**
      * Get the relationship data.
      *
@@ -277,6 +309,10 @@ public function getRelationValue($key)
      */
     public function __isset($key)
     {
+        if ($key === 'id') {
+            return $this->hasId();
+        }
+
         return parent::__isset($key) || $this->hasRelationship($key) || $this->hasRelationship(snake_case($key));
     }
 

tests/ItemTest.php

@@ -103,6 +103,40 @@ public function it_returns_id_when_id_isset()
         $this->assertEquals(1234, $item->getId());
     }
 
+    /**
+     * @test
+     */
+    public function it_can_set_the_id_using_the_magic_method()
+    {
+        $item = new Item();
+
+        $item->id = 1234;
+        $this->assertEquals(1234, $item->getId());
+    }
+
+    /**
+     * @test
+     */
+    public function it_can_get_the_id_using_the_magic_method()
+    {
+        $item = new Item();
+        $item->setId(1234);
+
+        $this->assertEquals(1234, $item->id);
+    }
+
+    /**
+     * @test
+     */
+    public function it_can_check_if_the_id_is_set_using_the_magic_method()
+    {
+        $item = new Item();
+
+        $this->assertFalse(isset($item->id));
+        $item->setId(1234);
+        $this->assertTrue(isset($item->id));
+    }
+
     /**
      * @test
      */