Hi Daria,
Thank you for sharing more details and the patience.

1. I am sorry but the above is not doable with BuddyPress Member Types alone( May be we can use a 3rd member type called international? I will be thinking a bit more about it today).

2. The opposite of it(which member types a user want to see is easily doable).

The member type is like category so we can include whole category or exclude whole category but can not do the same for individuals.

It is possible to implement it as non member type solution though.

PS:- I will share the code for member type by Sunday evening.

Thank you
Brajesh

Hi Daria,
Thank you. Yes, we can do that in future.

Here I am going to show two approaches( I will prefer second if feasible).

Strategy 1 :- Using member_type__in like this

/**
 * Restrict members list by member type.
 *
 * @param array $args args.
 *
 * @return array
 */
function buddydev_filter_by_opposite_member_type( $args ) {

	//  No need to change members listing if the user is not logged in.
	if ( ! is_user_logged_in() ) {
		return $args;
	}

	// Map of visible member types based on the member type.
	// 'male', 'female' are member type names.
	$visible_types_map = array(
		'male'   => array( 'international', 'female' ),
		'female' => array( 'canada',  'male' ),
	);

	$member_types = bp_get_member_type( get_current_user_id(), false );
	$member_type = '';
	// check if the user has a member type that may trigger the selection.
	foreach ( $member_types as $member_type_name ) {
		if ( isset( $visible_types_map[ $member_type_name ] ) ) {
			$member_type = $member_type_name; //found.
			break;
		}
	}

	// If the user does not have a member type
	// or if the user does not need the restriction.
	if ( empty( $member_type ) || empty( $visible_types_map[ $member_type ] ) ) {
		return $args;
	}

	$args['member_type__in'] = $visible_types_map[ $member_type ];
	return $args;

}

add_filter( 'bp_after_has_members_parse_args', 'buddydev_filter_by_opposite_member_type' );

The problem with this approach is that instead of “AND”ing the coditions are “OR”ed. Eg. Instead of ‘international’ AND ‘female’ it becomes ‘international’ OR ‘female’ and it does not server our purpose.

Strategy 2: Use member_type__not_in to exclude member types. It only works if all the members have atleast one member type assigned(It does not matter which member type)

/**
 * Restrict members list by member type.
 *
 * @param array $args args.
 *
 * @return array
 */
function buddydev_filter_by_opposite_member_type2( $args ) {

	//  No need to change members listing if the user is not logged in.
	if ( ! is_user_logged_in() ) {
		return $args;
	}

	// Map of visible member types based on the member type.
	// 'male', 'female' are member type names.
	$visible_types_map = array(
		'male'   => array( 'international', 'female' ),
		'female' => array( 'canada',  'male' ),
	);

	$member_types = bp_get_member_type( get_current_user_id(), false );
	$member_type = '';
	// check if the user has a member type that may trigger the selection.
	foreach ( $member_types as $member_type_name ) {
		if ( isset( $visible_types_map[ $member_type_name ] ) ) {
			$member_type = $member_type_name; //found.
			break;
		}
	}

	// If the user does not have a member type
	// or if the user does not need the restriction.
	if ( empty( $member_type ) || empty( $visible_types_map[ $member_type ] ) ) {
		return $args;
	}
	// Find all registered types and deduce the types which are invisible.
	$all_types = bp_get_member_types(array(), 'names' );
	$invisible_types = array_diff( $all_types, (array) $visible_types_map[ $member_type ] );

	$args['member_type__not_in'] = $invisible_types;
	return $args;

}

add_filter( 'bp_after_has_members_parse_args', 'buddydev_filter_by_opposite_member_type2' );

You only specify which member types will be visible. We calculate the invisible types automatically. This works to AND our conditions but there is an issue. If a user does not have any member type, they will show up in the list. In other words, if all uses are guaranteed to have at least 1 member type, it works.

Regards
Brajesh

Hi Daria,
Sure, please do let me know how it goes.

About the global members options, It will be nice if we can discuss after 1st Nov. I have some urgent tasks that need attention till then and I will be glad to take over it after that.

I am sharing my email in next private reply.

Thank you
Brajesh