Use Redis to Make your Ruby objects Likeable
!¶ ↑
I no longer use this gem in production (it was written for Gowalla), if you do and want to help me maintain it, let me know @schneems.
You like this¶ ↑
Likeable
will allow your models to be liked by users, just drop a few lines of code into your model and you're good to go.
class Comment include Likeable # ... end class User include Likeable::UserMethods # ... end Likeable.setup do |likeable| likeable.redis = Redis.new end comment = Comment.find(15) comment.like_count # => 0 current_user.like!(comment) # => #<Likeable::Like ... > comment.like_count # => 1 comment.likes # => [#<Likeable::Like ... >] comment.likes.last.user # => #<User ... > comment.likes.last.created_at # => Wed Jul 27 19:34:32 -0500 2011 comment.liked_by?(current_user) # => true current_user.all_liked(Comment) # => [#<Comment ...>, ...] liked_comment = Likeable.find_by_resource_id("Comment", 15) liked_comment == comment # => true
This library doesn't do dislikes, if you want something with more flexibility check out opinions.
Screencast¶ ↑
You can view a screencast of likeable in action on youtube. There is also an example Likeable rails application that you can use to follow along.
Setup¶ ↑
Gemfile:
gem 'likeable'
Next set up your Redis connection in initializers/likeable.rb:
Likeable.setup do |likeable| likeable.redis = Redis.new end
Then add the Likeable::UserMethods
module to models/user.rb:
class User include Likeable::UserMethods end
Finally add Likeable
module to any model you want to be liked:
class Comment include Likeable end
Rails Info¶ ↑
If you're using Likeable
in Rails this should help you get started
controllers/likes_controller.rb
class LikesController < ApplicationController def create target = Likeable.find_by_resource_id(params[:resource_name], params[:resource_id]) current_user.like!(target) redirect_to :back, :notice => 'success' end def destroy target = Likeable.find_by_resource_id(params[:resource_name], params[:resource_id]) current_user.unlike!(target) redirect_to :back, :notice => 'success' end end
config/routes.rb
delete 'likes/:resource_name/:resource_id' => "likes#destroy", :as => 'like' post 'likes/:resource_name/:resource_id' => "likes#create", :as => 'like'
helpers/like_helper.rb
def like_link_for(target) link_to "like it!!", like_path(:resource_name => target .class, :resource_id => target.id), :method => :post end def unlike_link_for(target) link_to "unlike it!!", like_path(:resource_name => target.class, :resource_id => target.id), :method => :delete end
Then in any view you can simply call the helper methods to give your user a link
<%- if @user.likes? @comment -%> <%= unlike_link_for @comment %> <%- else -%> <%= like_link_for @comment %> <%- end -%>
Why¶ ↑
We chose Redis because it is screaming fast, and very simple to work with. By using redis for likeable we take load off of our relational database and speed up individual calls retrieve information about the “liked” state of an object. If you're not using redis in production, and don't want to, there are many other great liking/voting libraries out there such as thumbs up.
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Authors¶ ↑
Richard Schneeman for Gowalla <3
Contribution¶ ↑
Fork away. If you want to chat about a feature idea, or a question you can find me on the twitters @schneems. Put any major changes into feature branches. Make sure all tests stay green, and make sure your changes are covered.
licensed under MIT License Copyright © 2011 Schneems. See LICENSE.txt for further details.