discourse/app/serializers/admin_user_serializer.rb

class AdminUserSerializer < BasicUserSerializer

  attributes :email, 
             :active, 
             :admin, 
             :last_seen_age, 
             :days_visited,
             :last_emailed_age,
             :created_at_age, 
             :username_lower,
             :trust_level,
             :flag_level,
             :username, 
             :avatar_template,
             :topics_entered,
             :posts_read_count,
             :time_read,
             :can_approve,
             :approved,
             :banned_at,
             :banned_till,
             :is_banned,
             :ip_address

  def is_banned
    object.is_banned?
  end

  def can_impersonate
    scope.can_impersonate?(object)
  end

  def last_emailed_age
    return nil if object.last_emailed_at.blank?
    AgeWords.age_words(Time.now - object.last_emailed_at)
  end

  def last_seen_age
    return nil if object.last_seen_at.blank?
    AgeWords.age_words(Time.now - object.last_seen_at)
  end

  def time_read
    return nil if object.time_read.blank?
    AgeWords.age_words(object.time_read)
  end

  def created_at_age
    AgeWords.age_words(Time.now - object.created_at)
  end

  def can_approve
    scope.can_approve?(object)
  end

  def include_can_approve?
    SiteSetting.must_approve_users
  end

  def include_approved?
    SiteSetting.must_approve_users
  end

end