Allows for threaded comments to be added to different models while comment hierarchy is handled via the ancestry gem (uses a materialised path pattern).

In your Gemfile, add:

gem 'threadable_comments'

and run bundle install.

• To install:

    rails generate threadable_comments:migration
  

  This will generate the migration script necessary for the table

class Article < ActiveRecord::Base
  has_threadable_comments
end

• Add a comment to a model instance, for example an Article:

    @user_who_commented = @current_user
    @article.add_comment "This is my comment!", @user_who_commented
  

• To reply to a comment:

    @comment.reply = "This is a reply!", @user_who_commented
  

• To retrieve all comments for an article, including child comments:

    @all_comments = @article.comments
  

• To retrieve only the root comments without their child comments:

    @root_comments = @article.root_comments
  

• To check if a comment has children:

    @comment.has_children?
  

• To get a comment's parent:

    @comment.parent
  

• To verify the number of direct children a comment has:

    @comment.children.count
  

• To verify the number of children and grand-children a comment has:

    @comment.descendants.count
  

• To retrieve a comment's children:

    @comment.children
  

Once you have a comment in your hands, you can use all the methods and scope of the ancestry gem to access children and parents of the comment.

• Inspired from act_as_commentable_with_threading