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POActs as commentable with threading example
 

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  1. POActs as commentable with threading example
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    <p>I'm new to Rails and am currently developing a blog. I want to know if there is a tutorial on how to use Acts as commentable with threading, since the only instructions to use from the GitHub are to add <code>acts_as_commentable</code> to your model.</p> <ol> <li>How should I create the form for new comments?</li> <li>How can I retrieve all the comments from a model?</li> <li>How do I configure the routes in order to show comments?</li> <li>How do I modify my controllers to make this feature available?</li> </ol> <p></p> <pre><code>class Comment &lt; ActiveRecord::Base acts_as_nested_set :scope =&gt; [:commentable_id, :commentable_type] #attr_accessible :commentable, :body, :user_id validates :body, :presence =&gt; true validates :user, :presence =&gt; true # NOTE: install the acts_as_votable plugin if you # want user to vote on the quality of comments. #acts_as_votable belongs_to :commentable, :polymorphic =&gt; true # NOTE: Comments belong to a user belongs_to :user # Helper class method that allows you to build a comment # by passing a commentable object, a user_id, and comment text # example in readme def self.build_from(obj, user_id, comment) new \ :commentable =&gt; obj, :body =&gt; comment, :user_id =&gt; user_id end #helper method to check if a comment has children def has_children? self.children.any? end # Helper class method to lookup all comments assigned # to all commentable types for a given user. scope :find_comments_by_user, lambda { |user| where(:user_id =&gt; user.id).order('created_at DESC') } # Helper class method to look up all comments for # commentable class name and commentable id. scope :find_comments_for_commentable, lambda { |commentable_str, commentable_id| where(:commentable_type =&gt; commentable_str.to_s, :commentable_id =&gt; commentable_id).order('created_at DESC') } # Helper class method to look up a commentable object # given the commentable class name and id def self.find_commentable(commentable_str, commentable_id) commentable_str.constantize.find(commentable_id) end end </code></pre>
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