How to add users to Public Group using Apex in Salesforce?

How to add users to Public Group using Apex in Salesforce?

To add users to Public Group using Apex, we have to insert the entries in GroupMember entity.

As per the following trigger, when a user record is created, the created user is assigned to the hard coded public group id.

Sample Trigger:

trigger AddToPG on User (after insert) {
    List<GroupMember> GMlist = new List<GroupMember>();
    for(User U : Trigger.New) {
        if(U.isActive) {
            GroupMember GM = new GroupMember();
            GM.GroupId = '00GU0000001Zjeq';
            GM.UserOrGroupId = U.Id;
            GMList.add(GM);        
        }
    }
    if(!GMList.isEmpty()) {
        System.debug('Group Member List is ' + GMList);
        insert GMList;
    }
}

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