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CakePHP で Call to a member function save() on null

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CakePHPのControllerでDBにsave()しようとしたらエラーが出ました。
環境はCakePHP2.6です。

error
Fatal Error
Error: Call to a member function save() on null 
File: /home/test/Test/App/Controller/TestController.php 
Line: 6

Notice: If you want to customize this error message, create App/View/Errors/fatal_error.ctp

save()が無いって言ってます。
ソースはこんな感じで書いていました。

App/Controller/TestController.php
<?php
class TestController extends AppController {
    public function test() {
        if ($this->request->is('post'))
        {
            $this->Test->save($this->request->data);
        }
    }
}
?>
App/View/Test/test.ctp
<?php
  echo $this->Form->create('Test');
  echo $this->Form->input('Test', array('type' => 'text'));
  echo $this->Form->end('submit');
?>
App/Model/Test.ctp
<?php
App::uses('AppModel', 'Model');

class Test extends AppModel {
  public $useTable = 'test';
}
?>

ControllerでloadModelする必要がありました。

App/Controller/testController.php
<?php
class TestController extends AppController {
    public function test() {
        if ($this->request->is('post'))
        {
            $this->loadModel('Test');
            $this->Test->save($this->request->data);
        }
    }
}
?>

Formのcreate()でModelのクラスを指定すればControllerでも勝手に読み込んでくれてるのかと思ってましたが、そんなことは無いみたいですね。

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