How can I change this method to query my master detail object?

Question

I am new to Apex trying to do some practice assignments and have gotten stuck on this junction object query.

Task: Edit the current getUser() method to do the following:

Return a custom object (that you define in the class) with the current getUser method's query data, and the list of teams the person belongs to (by querying the team assignments).

• Parent Object 1: User (Standard Object)
• Parent Object 2: Team (Custom Object)
• Junction Object: Team Assignments (Custom Object)

**Original Class & getUser Method**
global class CTI {
    global class CTIException extends Exception {}

    global static User getUser() { 
        return [SELECT Id, Name, ProfileId, Profile.Name, UserRoleId, UserRole.Name, Username 
                FROM User WHERE Id = :UserInfo.getUserId() ];
    }
}

Answer 1

Approach 1, return a User SObject with children that identify Teams

public static User getUdserData() {
   return [SELECT Id, UserName, ...,
            (SELECT Team__r.Name 
               FROM Team_Relationships__r)
            FROM User
            WHERE Id = UserInfo.getUserId()];
}

Approach 2 - return a custom type

public class UserData {
   public User u;
   public Team__c[] userTeams = new List<Team__c>();
}

public static UserData getUser() { 
    UserData ud = new UserData();
    ud.u = [SELECT Id, Name, ProfileId, Profile.Name, UserRoleId, UserRole.Name, Username 
            FROM User WHERE Id = :UserInfo.getUserId() ];
    for (Team_Assignment__c ta: 
      [SELECT Team__r.Name FROM Team_Assignment__c
         WHERE User.Id = :UserInfo.getUserId()]) {
      ud.userTeams.add(ta.Team__r.Name);
    }
    return ud;
}

So, a custom type is returned with the User and a list of Team__c