comments.rb

# We use includes(:member) to solve one of the N+1 issues by loading
# all of the members in a single query.
serialized_comments = article.
  comments.
  includes(:member).
  arrange_serializable do |comment, children|
    # This block is invoked for every node in the tree, which lets us
    # build out a tree of serialized comments.
    Api::V1::CommentSerializer.new(comment, children: children)
  end