Test and readme update to show how to use ArrayObject to persist

README.md

@@ -86,6 +86,8 @@ dive on automatic `JOIN` mapping, ordering and limiting below, keep reading!
 
 ### Persisting
 
+#### Persist with stdClass
+
 You can insert a new author into the database using the following example. We're using
 `stdClass`, but you will see later on in this guide just how easy it is to use specific classes
 for each mapping.
@@ -106,6 +108,21 @@ keep the state in memory, flushing sends it all to the database.
 After a `flush()` if you `print $alexandre->id`, it will reflect the auto incremented
 value from the database.
 
+#### Persist with ArrayObject
+
+You can create a new author with `ArrayObject` too. Let's supose that you get a post 
+request from a form with the field _name_ to create an author. You can do something like this:
+
+```php
+<?php $alexandre = new \ArrayObject($_POST, \ArrayObject::STD_PROP_LIST);
+      $alexandre->created_at = date('Y-m-d H:i:s');
+
+      $mapper->author->persist($alexandre);
+      $mapper->flush();
+```
+
+This is just to show what you can do, ofcourse you have to validate the `$_POST` var first.
+
 ### Joining
 
 In the sample below we're going to get all the comments, from all the posts created

tests/library/Respect/Relational/MapperTest.php

@@ -806,6 +806,17 @@ public function test_typed_single() {
         $this->assertEquals('Title Changed', $result->title);
     }
 
+    public function test_persist_new_with_arrayobject()
+    {
+        $mapper = $this->mapper;
+        $arrayEntity = array('id' => 10, 'name' => 'array_object_category', 'category_id' => null);
+        $entity = new \ArrayObject($arrayEntity);
+        $mapper->category->persist($entity);
+        $mapper->flush();
+        $result = $this->conn->query('select * from category where id=10')->fetch(PDO::FETCH_OBJ);
+        $this->assertEquals('array_object_category', $result->name);
+    }
+
 }
 
 class Postcomment {