Adding list values to apex map<String,List<Sobject>>

Group Information in a Map

Map<Id, List<Id>> userRoleToUsers = new Map<Id, List<Id>>();

for(User newUser : [SELECT UserRoleId FROM User LIMIT 50000]) {
	if(userRoleToUsers.containsKey(newUser.UserRoleId)) {
		List<Id> usersId = userRoleToUsers.get(newUser.UserRoleId);
		usersId.add(newUser.Id);
		userRoleToUsers.put(newUser.UserRoleId, usersId);
	} else {
		userRoleToUsers.put(newUser.UserRoleId, new List<Id> { newUser.Id });
	}
}

Is it the same?

Hi @emoran, can you please elaborate as of how can we use the list values in Map<Id, List> to create a new record for each id in the List in the Map?

Hi @Lorenzo8912 @pathakarchit, sorry for leaving this, I will create a small sample and comment the code for better undesrtanding.

I think we can write above code as below:

    Map<Id, List<Id>> userRoleToUsers = new Map<Id, List<Id>>();
    for(User newUser : [SELECT UserRoleId FROM User LIMIT 50000]) {
        if(userRoleToUsers.containsKey(newUser.UserRoleId)) {
            userRoleToUsers.get(newUser.UserRoleId).add(newUser.Id);
        } else {
            userRoleToUsers.put(newUser.UserRoleId, new List<Id> { newUser.Id });
        }
    }