- First draft of current WIP

src/Annotation/Property/Field/CreatedAt.php

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+<?php
+
+namespace Ulmus\Annotation\Property\Field;
+
+class CreatedAt extends \Ulmus\Annotation\Property\Field {
+
+    public function __construct()
+    {
+        $this->nullable = false;
+        $this->type = "timestamp";
+        $this->attributes['default'] = "CURRENT_TIMESTAMP";
+    }
+}

src/Annotation/Property/Field/ForeignKey.php

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+<?php
+
+namespace Ulmus\Annotation\Property\Field;
+
+/**
+ * Since we need consistancy between the declaration of our ID and FK fields, it
+ * was decided to extend the Id class instead of Field for this case.
+ */
+class ForeignKey extends Id {
+
+    public function __construct()
+    {
+        parent::__construct();
+
+        unset($this->nullable);
+        $this->attributes['primary_key'] = false;
+    }
+
+}

src/Annotation/Property/Field/Id.php

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+<?php
+
+namespace Ulmus\Annotation\Property\Field;
+
+class Id extends \Ulmus\Annotation\Property\Field {
+
+    public function __construct()
+    {
+        $this->nullable = false;
+        $this->type = "int";
+        $this->attributes['unsigned'] = true;
+        $this->attributes['primary_key'] = true;
+    }
+
+}

src/Annotation/Property/Field/UpdatedAt.php

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+<?php
+
+namespace Ulmus\Annotation\Property\Field;
+
+class UpdatedAt extends \Ulmus\Annotation\Property\Field {
+
+    public function __construct()
+    {
+        $this->nullable = true;
+        $this->type = "timestamp";
+        $this->attributes['update'] = "CURRENT_TIMESTAMP";
+        $this->attributes['default'] = null;
+    }
+}