```ruby
class TreeBuilderRolesByServer < TreeBuilderDiagnostics
  has_kids_for MiqServer, [:x_get_tree_miq_server_kids]

  private

  def x_get_tree_roots(_count_only, _options)
    x_get_tree_miq_servers
  end

  def override(node, _object)
    if @sb[:diag_selected_id] && node[:key] == "svr-#{@sb[:diag_selected_id]}"
      node[:highlighted] = true
    end
  end

  def x_get_tree_miq_servers
    @root.miq_servers.sort_by { |s| s.name.to_s }.each_with_object([]) do |server, objects|
      unless @sb[:diag_selected_id] # Set default selected record vars
        @sb[:diag_selected_model] = server.class.to_s
        @sb[:diag_selected_id] = server.id
      end
      objects.push(server)
    end
  end

  def x_get_tree_miq_server_kids(parent, _count_only)
    parent.assigned_server_roles.sort_by { |asr| asr.server_role.description }.each_with_object([]) do |asr, objects|
      next if parent.kind_of?(MiqRegion) && !asr.server_role.regional_role? # Only regional roles under Region
      next if asr.server_role.name == "database_owner"
      objects.push(asr)
    end
  end
end
```

Build the selected node key from the session stored model in RBS 🌳🐞
user
```ruby
class TreeBuilderRolesByServer < TreeBuilderDiagnostics
  has_kids_for MiqServer, [:x_get_tree_miq_server_kids]

  private

  def x_get_tree_roots(_count_only, _options)
    x_get_tree_miq_servers
  end

  def override(node, _object)
    if @sb[:diag_selected_id] && node[:key] == "#{self.class.get_prefix_for_model(@sb[:diag_selected_model]) || 'svr'}-#{@sb[:diag_selected_id]}"
      node[:highlighted] = true
    end
  end

  def x_get_tree_miq_servers
    @root.miq_servers.sort_by { |s| s.name.to_s }.each_with_object([]) do |server, objects|
      unless @sb[:diag_selected_id] # Set default selected record vars
        @sb[:diag_selected_model] = server.class.to_s
        @sb[:diag_selected_id] = server.id
      end
      objects.push(server)
    end
  end

  def x_get_tree_miq_server_kids(parent, _count_only)
    parent.assigned_server_roles.sort_by { |asr| asr.server_role.description }.each_with_object([]) do |asr, objects|
      next if parent.kind_of?(MiqRegion) && !asr.server_role.regional_role? # Only regional roles under Region
      next if asr.server_role.name == "database_owner"
      objects.push(asr)
    end
  end
end
```
assistant