Adds the title of the idea to the BuddyPress activity action string

wp-idea-stream-custom.php

<?php
/**
 * See https://wordpress.org/support/topic/adding-idea-title-to-buddypress-activity-stream
 */ 
 
function jasonverdelli_set_wp_idea_stream_activity_actions( $wp_idea_stream_activity_actions = array() ) {
	if ( ! empty( $wp_idea_stream_activity_actions['new_' . wp_idea_stream_get_post_type() ] ) ) {
		$wp_idea_stream_activity_actions['new_' . wp_idea_stream_get_post_type() ]->action_callback = 'jasonverdelli_format_idea_activity_action';
	}

	return $wp_idea_stream_activity_actions;
}
add_filter( 'wp_idea_stream_buddypress_get_activity_actions', 'jasonverdelli_set_wp_idea_stream_activity_actions', 10, 1 );

function jasonverdelli_format_idea_activity_action( $action = '', $activity = null ) {
	if ( ! is_object( $activity ) ) {
		return false;
	}

	if ( isset( $activity->post_title ) ) {
		$idea_title = $activity->post_title;
	} elseif ( ! empty( $activity->id ) ) {
		$idea_title = bp_activity_get_meta( $activity->id, 'wp_idea_stream_idea_title' );
	}

	/**
	 * In case the idea was published without a title
	 * or the activity meta was not found.
	 */
	if ( empty( $idea_title ) ) {
		// Defaults to no title.
		$idea_title = esc_html( '(no title)' );

		switch_to_blog( $activity->item_id );

		$post = get_post( $activity->secondary_item_id );
		if ( is_a( $post, 'WP_Post' ) ) {
			// Does the post have a title ?
			if ( ! empty( $post->post_title ) ) {
				$idea_title = $post->post_title;
			}

			// Make sure the activity exists before saving the post title in activity meta.
			if ( ! empty( $activity->id ) ) {
				bp_activity_update_meta( $activity->id, 'wp_idea_stream_idea_title', $idea_title );
			}
		}

		restore_current_blog();
	}

	$post_type_object = get_post_type_object( wp_idea_stream_get_post_type() );

	$action = sprintf( '%1$s wrote a new %2$s, %3$s',
		bp_core_get_userlink( $activity->user_id ),
		esc_html( mb_strtolower( $post_type_object->labels->singular_name, 'UTF-8' ) ),
		'<a href="' . esc_url( $activity->primary_link ) . '">' . esc_html( $idea_title ) . '</a>'
	);

	return apply_filters( 'jasonverdelli_format_idea_activity_action', $action );
}