API: allow date attributes to be added

src/Core/Models/Discussion.php

@@ -47,7 +47,6 @@ class Discussion extends Model
      *
      * @var array
      */
-    protected $dates = ['start_time', 'last_time'];
 
     /**
      * An array of posts that have been added during this request.
@@ -62,6 +61,7 @@ class Discussion extends Model
      * @var \Flarum\Core\Models\Post[]
      */
     public $removedPosts = [];
+    protected static $dates = ['start_time', 'last_time'];
 
     /**
      * The user for which the state relationship should be loaded.

src/Core/Models/Model.php

@@ -17,19 +17,26 @@ use LogicException;
  *
  * @todo Refactor out validation, either into a trait or into a dependency.
  *       The following requirements need to be fulfilled:
- *       - Ability for extensions to alter ruleset.
+ *       - Ability for extensions to alter ruleset (add, modify, remove).
  *       - Ability for extensions to add custom rules to the validator instance.
  *       - Use Flarum's translator with the validator instance.
  */
 abstract class Model extends Eloquent
 {
     /**
-     * Indicates if the model should be timestamped. Turn them off by default.
+     * Indicates if the model should be timestamped. Turn off by default.
      *
      * @var boolean
      */
     public $timestamps = false;
 
+    /**
+     * The attributes that should be mutated to dates.
+     *
+     * @var array
+     */
+    public static $dates = [];
+
     /**
      * The validation rules for this model.
      *
@@ -162,6 +169,26 @@ abstract class Model extends Eloquent
         return $rules;
     }
 
+    /**
+     * Get the attributes that should be converted to dates.
+     *
+     * @return array
+     */
+    public function getDates()
+    {
+        return static::$dates;
+    }
+
+    /**
+     * Add an attribute to be converted to a date.
+     *
+     * @param string $attribute
+     */
+    public static function addDate($attribute)
+    {
+        static::$dates[] = $attribute;
+    }
+
     /**
      * Get an attribute from the model. If nothing is found, attempt to load
      * a custom relation method with this key.