当'post'替换为'get'时，为什么CakePHP会添加新行？

Question

I edit a row on the Post table or add a new row to it from edit() function in PostsController. The function looks like this:

public function edit($id = null) {
// Has any form data been POSTed?
if ($this->request->is('post')) { //Replaced 'post' by 'get' in this line

    // If the form data can be validated and saved...
    if ($this->Post->save($this->request->data)) {

        // Set a session flash message and redirect.
        $this->Session->setFlash('Updated the Post!');
        return $this->redirect('/posts');
    }
}

// If no form data, find the post to be edited
// and hand it to the view.
$this->set('post', $this->Post->findById($id));

}

I simply replaced 'post' by 'get' to see what would happen and it went on creating new rows without even taking me to the form. I still get the flash message 'Updated the Post!', but without taking any form data.

If the code in edit.ctp is required, here it is:

<?php
echo $this->Form->Create('Post');
echo $this->Form->input('id', array('type' => 'hidden','default'=>$post['Post' ['id']));
    echo $this->Form->input('title',array('default'=>$post['Post']['title']));
    echo $this->Form->input('body',array('default'=>$post['Post']['body']));
    echo $this->Form->end('Update');
    ?>

Any thoughts on why this might be happening?

Edit: Added CakePHP Version

I am using CakePHP 2.4.5

Answer 1

What you are doing makes no sense. Why would you want to switch the "post" by "get" here? Of course it will then generate new rows, as you effectively trigger a save on each page load (GET). Don't do that. The code you had there was just fine - IF you also took PUT into consideration. For edit forms, it is not a post, but:

if ($this->request->is('put')) {}

PS: If you want to make sure it always works for both add/edit, use

 if ($this->request->is(array('post', 'put')) {}

But NEVER replace it with "get".