BuddyPress.org

Hi,

if you can code, it won’t be a big work.

Perhaps taking the problem from another side would be a better solution ?

Each blog post has an author. Presuming you want to show the author’s favorites ? In this case, instead of re-building the fav list on the blog template, you could link to this author profile, directly on his fav tab.

I have a shortcode ready for this, in case of you want use that solution.

Hummm, now it’s me who doesn’t understand !

You asked first
is there any way we can add the existing buddypress favorites to the blog posts

and now you say
I wish to have it in blogs – so […] I can press Favorite

Sorry if i misunderstand your request, english is not my mother language… Do you want to add a [favorite] button to each blog post ? Or do you want to remove some filters from activity favorites ?

Activity → Favorites

Sorry, I haven’t tested the plugin i mentionned. You’re right it doesn’t show a button but simply display favorites differently.

OK, here is a snippet you can add to bp-custom.php which will add a Favorite button to blog posts.

Note
the function works with currrent BP version (2.6.2).
The grey side of this solution is that you have to use a child-theme and to tweak a little the way the button will show. This is very theme dependant and would not be used the same way if you use ie. Twenty Sixteen or ie. Graphene.

While using 2016, you can simply echo the button on the template.
If you use a more complex theme, you could probably use an existing action hook of the theme. This means that you need a function who hooks into such a predefined placeholder.

In any case, the file to modify is your theme’s single.php. Copy it into the child theme to get:
/wp-content/themes/child-theme/single.php

If you don’t see any do_action( ‘something’ ), you add the following in an appropriate place:

echo get_fav_or_unfav_button_for_post( $post );
Certainly inside the post loop, and probably below the post and before the comments.

If you see some action hooks in single.php, you add this function to bp-custom:

function fav_buttons() {
  echo get_fav_or_unfav_button_for_post( $post );
}
add_action( 'graphene_before_comment_template', 'fav_buttons' );

You need to change graphene_before_comment_template to the action name used by your theme.

add_action( 'graphene_before_comment_template'

Hope to be clear.

And here the function for the button:

function get_fav_or_unfav_button_for_post( $post ) {
global $bp, $activities_template, $post;

	// only show the button to logged-in users
	if ( ! is_user_logged_in() ) {
	return '';
	}
	
	$activity_id = bp_activity_get_activity_id( array(
		'user_id' => $post->post_author,
		'type' => 'new_blog_post',
		'component' => 'blogs',
		'item_id' => 1,  // blog_ID
		'secondary_item_id' => $post->ID // post_ID
		) );
	
	if ( ! $activity_id ) {
	return '';
	}

	bp_has_activities(); // update $activities_template with user's favs
	$old_value = false;
		
	if ( isset( $activities_template->activity->id ) ) {
		$old_value = $activities_template->activity->id;
		$activities_template->activity->id = $activity_id;
	} else {
		$activities_template->activity = (object) array( 'id' => $activity_id );
	}
	
	// build the template
	$code = '';
	$code .= '<div class="activity-meta">'."\n";

		if ( ! bp_get_activity_is_favorite() ) {
		// if not favorited, add a "Favorite" button
		$code .= ' <a href="'.bp_get_activity_favorite_link( ).'" class="button fav bp-secondary-action" title="Add to my favorites">Favorite</a>'."\n";
		
		} else {
		
		// else, add "Unfavorite" button
		$code .= ' <a href="'.bp_get_activity_unfavorite_link( ).'" class="button unfav bp-secondary-action" title="Remove from my favorites">Unfavorite</a>'."\n";
		
		// Bonus button: "View all my favorites"
		$code .= ' <a href="'.bp_loggedin_user_domain() . 'activity/favorites/" class="button unfav bp-secondary-action">View all my favs</a>'."\n";
		}
		
	// closing .activity-meta
	$code .= '</div>'."\n"; 

	if ( false !== $old_value ) {
		$activities_template->activity->id = $old_value;
	} else {
		//$activities_template->activity = null;
$activities_template->activity = (object) array( 'id' => $activity_id );
	}
	return $code;

}

And voila !

There a plugin that does Favourite notifications:

https://wordpress.org/plugins/bp-favorite-notification/