restrict attachment to specific post categories

Hello @pauldewin,

I’m glad that the plugin was useful to you.

You can try this snippet:
(adding attachment will be allowed only for category with ID 56)

function custom_dco_ca_disable_attachment_field() {
	$url = "//{$_SERVER['HTTP_HOST']}{$_SERVER['REQUEST_URI']}";
	$post_id = url_to_postid( $url );
	$cats = wp_get_post_categories( $post_id, array( 'fields' => 'ids' ) );
	$allow_cat_id = 56;
	if ( in_array( $allow_cat_id, $cats ) ) {
		return false;
	}
		
	return true;
}

add_filter( 'dco_ca_disable_attachment_field', 'custom_dco_ca_disable_attachment_field' );

I just used this code and it worked seamlessly. Thanks so much, Denis!

Well, I spoke too soon. While this code does restrict the upload option to a particular category, it also breaks the attachment upload functionality. Now whenever I upload an image, it posts the comment, but it doesn’t upload/attach the image. Any suggestions?

Hmm, indeed, the upload stopped working after applying the code. At the moment, I don’t know how to fix it. I’ll try to come back to this later.

For a quick fix, you can try this snippet.

function disable_upload_field( $markup ) {
	if( ! in_category( 56 ) ) {
		return '';
	}
	
	return $markup;
}

add_filter( 'dco_ca_form_element_label', 'disable_upload_field' );
add_filter( 'dco_ca_form_element_input', 'disable_upload_field' );

It will not disable upload altogether, but will hide the upload field in all categories except the specified one.

Just tried that code and my site crashed. ?? I’m back online now, but unfortunately I’m not savvy enough to troubleshoot why it went down.

Any ideas or suggestions on why that code snippet above would cause a critical error?