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;
		}

		if ( !empty( $this->id ) ) {
			$sql = $wpdb->prepare( "UPDATE {$bp->groups->table_name_members} SET inviter_id = %d, is_admin = %d, is_mod = %d, is_banned = %d, user_title = %s, date_modified = %s, is_confirmed = %d, comments = %s, invite_sent = %d WHERE id = %d", $this->inviter_id, $this->is_admin, $this->is_mod, $this->is_banned, $this->user_title, $this->date_modified, $this->is_confirmed, $this->comments, $this->invite_sent, $this->id );
		} else {
			// Ensure that user is not already a member of the group before inserting.
			if ( $wpdb->get_var( $wpdb->prepare( "SELECT id FROM {$bp->groups->table_name_members} WHERE user_id = %d AND group_id = %d AND is_confirmed = 1 LIMIT 1", $this->user_id, $this->group_id ) ) ) {
				return false;
			}

			$sql = $wpdb->prepare( "INSERT INTO {$bp->groups->table_name_members} ( user_id, group_id, inviter_id, is_admin, is_mod, is_banned, user_title, date_modified, is_confirmed, comments, invite_sent ) VALUES ( %d, %d, %d, %d, %d, %d, %s, %s, %d, %s, %d )", $this->user_id, $this->group_id, $this->inviter_id, $this->is_admin, $this->is_mod, $this->is_banned, $this->user_title, $this->date_modified, $this->is_confirmed, $this->comments, $this->invite_sent );
		}

		if ( !$wpdb->query( $sql ) )
			return false;

		$this->id = $wpdb->insert_id;

		// Update the user's group count.
		self::refresh_total_group_count_for_user( $this->user_id );

		// Update the group's member count.
		self::refresh_total_member_count_for_group( $this->group_id );

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

		return true;
	}