Can't seem to get simple HABTM to save...

So I have 2 models, Posts and Events.

Model Post.php looks like this: 

<?php

App::uses('AppModel','Model');

class Post extends AppModel{

...took out variables for brevity sake

public $hasAndBelongsToMany = array(

"Events"=>array(

"className"=>"Event",

"joinTable"=>"events_posts",

"foreignKey"=>"post_id",

"associationForeignKey"=>"event_id",

"unique"=>true

)

);

}

?>

Model Event.php has this: 

    public $hasAndBelongsToMany = array(

            "Posts"=>array(

                "className"=>"Post",

                "joinTable"=>"events_posts",

                "foreignKey"=>"event_id",

                "associationForeignKey"=>"post_id",

                "unique"=>true

            )

        );

In the database there's a table called events_posts with 2 fields: event_id & post_id

And finally, in a different controller, where I need to manually save stuff.... I have this code: 

                    $post_data = array(

                            "Post"=>array(

                                "image_id"=>$entry['id'],

                                "image_url"=>$entry['images']['standard_resolution']['url'],

                                "image_thumb"=>$entry['images']['low_resolution']['url'],

                                "image_text"=>$entry['caption']['text'],

                                "status"=>'1',

                                "created_on"=>$entry['created_time'],

                                "instagram_user_id"=>$user_id

                            ),

                            "Event"=>array(

                                "id"=>$event['Event']['id']

                            )

                        );

                    $this->Post->saveAll($post_data); 

And I've tried saveAll, save, and saveAssociated. The Post information saves, but nothing shows up in the events_posts table. What am I doing wrong? I'm sure it's gotta be some kind of alias mistake...

Thanks in advance for taking the time to read and help me!

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