Front-end acf_form() – Hooks Using Global $post

• Howdy_McGee

• July 26, 2018 at 7:57 am

I’m running into an issue with acf_form() where the hooks that are being passed $post_id are using the global $post. Is there a hook where I can modify this functionality?

For example, I have an hook that given the name post_content will display the post content based on the passed ID.

function themeprefix_acf_post_content( $value, $post_id ) {
	
	if( ! empty( $value ) ) {
		return $value;
	}
	
	return get_post_field( 'post_content', $post_id, 'edit' );
	
}
add_filter( 'acf/load_value/name=post_content', 'themeprefix_acf_post_content', 10, 2 );

The problem is on my front-end form if I have a field called post_content which I expect to be empty is instead filled with content from the actual page the form is on via global $post.

The only solution to this I can think of is to overwrite the global $post object with an empty post object before calling acf_form() and then converting it back at the end of the call. I’m hoping there’s a hook or alternative to this so acf_form() field hooks aren’t using the global $post ID.

• Howdy_McGee

• August 24, 2018 at 9:03 am

What I had was an ACF form on a frontend page where the user could create new posts. Something like this:

acf_form( array(
	'form'			=> true,
	'id'			=> 'prefix-acf-form',
	'post_id'		=> 'new_post',
	'new_post'		=> array(
		'post_type'		=> 'post_type_here',
		'post_status'	=> 'publish',
	),
	'field_groups'	=> array( Class_Here::get_acf_key( 'edit' ) ),
	'honeypot'		=> false,
) );

The idea being that I would save post_content field as the actual post content for the post.

The problem was that I was using global $post, so the pages content was being displayed instead of the expected nothing.

The solution was to check if the passed $post_id is either empty or new_post and if it is, return the value early before attempting to get the post content.

/**
 * Return post content if possible
 *
 * @param String $value - Field content
 * @param Mixed $post_id - Post ID, Empty, or 'new_post'
 *
 * @return String - Post content for given post ID
 */
function themeprefix_acf_post_content( $value, $post_id ) {
	
	// We already have a value for some reason, return it.
	if( ! empty( $value ) ) {
		return $value;
	}

	// We do not have a $post_id to pull from, return early.
	if( empty( $post_id ) || 'new_post' == $post_id ) {
		return $value;
	}
	
	return get_post_field( 'post_content', $post_id, 'edit' );
	
}
add_filter( 'acf/load_value/name=post_content', 'themeprefix_acf_post_content', 10, 2 );