app/lib/comment_tree.rb
class CommentTree
ROOT_COMMENTS_PER_PAGE = 10
attr_reader :commentable, :page, :order
def initialize(commentable, page, order = "confidence_score", valuations: false)
@commentable = commentable
@page = page
@order = order
@valuations = valuations
end
def comments
@comments ||= root_comments + root_descendants
end
def root_comments
base_comments.roots.send("sort_by_#{order}").page(page).per(ROOT_COMMENTS_PER_PAGE).for_render
end
def base_comments
if @valuations && commentable.respond_to?(:valuations)
commentable.valuations
else
commentable.comments
end
end
def root_descendants
root_comments.each_with_object([]) do |root, array|
array.concat(Comment.descendants_of(root).send("sort_descendants_by_#{order}").for_render.to_a)
end
end
def ordered_children_of(parent)
comments_by_parent_id[parent.id] || []
end
def comments_by_parent_id
comments.each_with_object({}) do |comment, array|
(array[comment.parent_id] ||= []) << comment
end
end
def comment_authors
comments.map(&:author)
end
end