Insert data inner join Cakephp 3.0 - mysql

Question

I'm new to CakePHP, I just finished the blog/article tutorial and now I am trying to add the comment system to it.
In my comments table I have, Id, article_Id, name, email, text and created. In my articles table I have Id, user_id, title, text, created.
I'm trying to add the comment according to the article ID by using Insert Inner join Query. So let's say a user views a specific article like /view/1, before he add comments, the article ID is already passed so he can comment accordingly to that specific article ID he is viewing. How can I do that? I hope I'm clear.
This is my add function for my comment:
public function leavemessage()
{
$comment = $this->Comments->newEntity();
$articles = $this->loadModel('Articles');
$leavemessage = $articles->find()
->hydrate(false)
->join([
'table' => 'comments',
'alias' => 'c',
'type' => 'LEFT',
'conditions' => 'c.article_id = articles.id',
])
->insert(['id'])
->where(['c.article_id = articles.id'])
->execute();
if ($this->request->is('post')) {
$comment = $this->Comments->patchEntity($comment, $this->request->data);
if ($this->Comments->save($comment)) {
$this->Flash->success('The comment has been saved.');
return $this->redirect([
'controller' => 'Articles',
'action' => 'index',
'c.article_id'
]);
} else {
$this->Flash->error('The comment could not be saved. Please, try again.');
}
}
$articles = $this->Comments->Articles->find('list', ['limit' => 200]);
$this->set(compact('comment', 'articles'));
$this->set('_serialize', ['comment']);
}
My add comments view
<div class="comments form large-10 medium-9 columns">
<?= $this->Form->create($comment); ?>
<fieldset>
<legend><?= __('Add Comment') ?></legend>
<?php
echo $this->Form->input('article_id', ['value' => $articleId]);
echo $this->Form->input('name');
echo $this->Form->input('email');
echo $this->Form->input('text');
?>
</fieldset>
<?= $this->Form->button(__('Submit')) ?>
<?= $this->Form->end() ?>
</div>