bp-xprofile-field-for-member-types : Alternative patch to get along with 5192.bp_xprofile_get_hidden_fields_for_user.patch one. see https://github.com/lmoffereins/bp-xprofile-field-for-member-types/issues/1 & https://buddypress.trac.wordpress.org/ticket/5192

1.02.patch

diff --git bp-xprofile-field-for-member-types.php bp-xprofile-field-for-member-types.php
index 6926728..c129368 100644
--- bp-xprofile-field-for-member-types.php
+++ bp-xprofile-field-for-member-types.php
@@ -115,6 +115,12 @@ final class BP_XProfile_Field_For_Member_Types {
 		// Admin: Profile Fields
 		add_action( 'xprofile_admin_field_name_legend', array( $this, 'admin_field_legend' ) );
 
+		// Custom registration page ?
+		add_action( 'bp_screens', array( $this, 'signup_for_member_type' ), 9 );
+
+		// Save the member type for a signup if needed
+		add_action( 'bp_core_activated_user', array( $this, 'signup_set_member_type' ), 10, 3 );
+
 		// Fire plugin loaded hook
 		do_action( 'bp_xprofile_field_for_member_types_loaded' );
 	}
@@ -169,6 +175,18 @@ final class BP_XProfile_Field_For_Member_Types {
 	public function filter_hidden_fields( $hidden_fields, $displayed_user_id, $current_user_id ) {
 		global $wpdb, $bp;
 
+		$current_screen = false;
+
+		// get_current_screen() is only available in Admin
+		if ( is_admin() ) {
+			$current_screen = get_current_screen();
+		}
+
+		// Make sure all fields are listed within the xProfile fields administration screen
+		if ( isset( $current_screen->id ) && false !== strpos( $current_screen->id, 'users_page_bp-profile-setup' ) ) {
+			return $hidden_fields;
+		}
+
 		// Hidden = All - Visible for displayed user AND current user
 		$all_fields = array_map( 'intval', (array) $wpdb->get_col( "SELECT id FROM {$bp->profile->table_name_fields}" ) );
 
@@ -207,8 +225,9 @@ final class BP_XProfile_Field_For_Member_Types {
 		}
 
 		// The primary field is for all, so bail
-		if ( 1 === (int) $field_id )
+		if ( 1 === (int) $field_id ) {
 			return true;
+		}
 
 		// Default to displayed user
 		if ( ! is_numeric( $user_id ) ) {
@@ -218,8 +237,12 @@ final class BP_XProfile_Field_For_Member_Types {
 		// Get the field's member types
 		if ( $member_types = $this->get_xprofile_member_types( $field_id, 'field' ) ) {
 
+			// Specific Registration page eg: site.url/register/member_type_slug
+			if ( empty( $user_id ) && bp_get_current_member_type() ) {
+				$u_member_types = array( bp_get_current_member_type() );
+
 			// Default to 'none' when the user has no member type(s)
-			if ( ! $u_member_types = bp_get_member_type( $user_id, false ) ) {
+			} elseif ( ! $u_member_types = bp_get_member_type( $user_id, false ) ) {
 				$u_member_types = array( 'none' );
 			}
 
@@ -416,6 +439,65 @@ final class BP_XProfile_Field_For_Member_Types {
 		// Output legend <span>
 		echo '<span class="member-types">(' . $legend . ')</span>';
 	}
+
+	/**
+	 * Checks if the registration form is a specific one
+	 * eg: site.url/register/member_type_slug 
+	 * 
+	 * @since ?
+	 */ 
+	public function signup_for_member_type() {
+		if ( ! bp_is_register_page() || ! bp_current_action() ) {
+			return;
+		}
+
+		// Get BuddyPress instance
+		$bp = buddypress();
+
+		// Is the current action a member type slug ? 
+		$matched_types = bp_get_member_types( array(
+			'has_directory'  => true,
+			'directory_slug' => bp_current_action(),
+		) );
+
+		if ( ! empty( $matched_types ) ) {
+			// Set the current member type
+			$bp->current_member_type = reset( $matched_types );
+
+			// Reset the current action to make sure the form is showing
+			$bp->current_action = '';
+
+			// Filter the signup usermeta to set the member type once the
+			// User has activated his account
+			add_filter( 'bp_signup_usermeta', array( $this, 'signup_usermeta' ), 10, 1 );
+		}
+	}
+
+	/**
+	 * Add a signup usermeta containing the member type for the future user 
+	 * 
+	 * @since ?
+	 */ 
+	public function signup_usermeta( $usermeta = array() ) {
+		if ( bp_get_current_member_type() ) {
+			$usermeta['bp_member_type'] = bp_get_current_member_type();
+		}
+
+		return $usermeta;
+	}
+
+	/**
+	 * Set the member type for the activated account 
+	 * 
+	 * @since ?
+	 */ 
+	public function signup_set_member_type( $user_id = 0, $key = '', $user = array() ) {
+		if ( empty( $user_id ) || empty( $user['meta']['bp_member_type'] ) ) {
+			return;
+		}
+
+		bp_set_member_type( $user_id, sanitize_key( $user['meta']['bp_member_type'] ) );
+	}
 }
 
 /**