How to remove the images from "Uploaded to this post"?

Question

I was wondering if there's a simple way to deselect images from uploaded to this post, but still have the images in the image library?

I uploaded some images while i was editing a post and this isn't the same as uploading images with Media > Upload.

For example, I make a post with 4 images, but overtime I don't like to use the 4 images as this particular theme auto creates a gallery from the images. When selecting insert media these images are "Uploaded to this post".

How to deselect some of these images from Uploaded to this post?

Answer 1

You have to unattach the images from the post.
And that means setting their 'post_parent' => 0 in wp_posts database table.

The plugin Unattach and Re-attach Media Attachments does exactly this, and it uses the following command to this end:

$wpdb->update(
    $wpdb->posts, 
    array( 'post_parent' => 0 ),
    array(
        'id' => (int)$_REQUEST['post_id'], 
        'post_type' => 'attachment'
    )
);