BuddyPress.org

Hello,

I want to restrict memberships to only one private group and multiple public groups. I was thinking of using the hook groups_member_before_save to do that validation. Is that the correct place?

This is how i researched..

in groups_join_group we have

$new_member                = new BP_Groups_Member;
	$new_member->group_id      = $group_id;
	$new_member->user_id       = $user_id;
	$new_member->inviter_id    = 0;
	$new_member->is_admin      = 0;
	$new_member->user_title    = '';
	$new_member->date_modified = bp_core_current_time();
	$new_member->is_confirmed  = 1;

	if ( !$new_member->save() )
		return false;

and in BP_Groups_Member we have

public function save() {
		global $wpdb;

		$bp = buddypress();

		$this->user_id       = apply_filters( 'groups_member_user_id_before_save',       $this->user_id,       $this->id );
		$this->group_id      = apply_filters( 'groups_member_group_id_before_save',      $this->group_id,      $this->id );
		$this->inviter_id    = apply_filters( 'groups_member_inviter_id_before_save',    $this->inviter_id,    $this->id );
		$this->is_admin      = apply_filters( 'groups_member_is_admin_before_save',      $this->is_admin,      $this->id );
		$this->is_mod        = apply_filters( 'groups_member_is_mod_before_save',        $this->is_mod,        $this->id );
		$this->is_banned     = apply_filters( 'groups_member_is_banned_before_save',     $this->is_banned,     $this->id );
		$this->user_title    = apply_filters( 'groups_member_user_title_before_save',    $this->user_title,    $this->id );
		$this->date_modified = apply_filters( 'groups_member_date_modified_before_save', $this->date_modified, $this->id );
		$this->is_confirmed  = apply_filters( 'groups_member_is_confirmed_before_save',  $this->is_confirmed,  $this->id );
		$this->comments      = apply_filters( 'groups_member_comments_before_save',      $this->comments,      $this->id );
		$this->invite_sent   = apply_filters( 'groups_member_invite_sent_before_save',   $this->invite_sent,   $this->id );

		/**
		 * Fires before the current group membership item gets saved.
		 *
		 * Please use this hook to filter the properties above. Each part will be passed in.
		 *
		 * @since 1.0.0
		 *
		 * @param BP_Groups_Member $this Current instance of the group membership item being saved. Passed by reference.
		 */
		do_action_ref_array( 'groups_member_before_save', array( &$this ) );

		// The following properties are required; bail if not met.
		if ( empty( $this->user_id ) || empty( $this->group_id ) ) {
			return false;
		}