Group Manager changes, remove old manager and add new manager to the group

Server-Side Components/Business Rules/Group Manager changes, remove old manager & add new manager/Code.js

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+(function executeRule(current, previous /*null when async*/) {
+
+    // Run only when the Manager field changes
+    if (current.manager.changes()) {
+
+        var groupID = current.sys_id.toString();
+
+        // Remove old manager from group membership
+        if (!gs.nil(previous.manager)) { 
+            var oldMember = new GlideRecord('sys_user_grmember');
+            oldMember.addQuery('group', groupID);
+            oldMember.addQuery('user', previous.manager);
+            oldMember.query();
+            while (oldMember.next()) {
+                oldMember.deleteRecord();
+            }
+        }
+
+        // Add new manager to group membership
+        if (!gs.nil(current.manager)) {
+            var newMember = new GlideRecord('sys_user_grmember');
+            newMember.initialize();
+            newMember.group = groupID;
+            newMember.user = current.manager;
+            newMember.insert();
+        }
+    }
+
+})(current, previous);

Server-Side Components/Business Rules/Group Manager changes, remove old manager & add new manager/ReadMe.md

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+When the Manager field changes on the Group table (sys_user_group), the system should automatically:
+
+Remove the previous manager from the group’s membership.
+
+Add the new manager as a member of the same group.