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.
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 # => trueThis library doesn't do dislikes, if you want something with more flexibility check out opinions.
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.
Gemfile:
gem 'likeable'
Next set up your Redis connection in initializers/likeable.rb:
Likeable.setup do |likeable|
likeable.redis = Redis.new
endThen add the Likeable::UserMethods module to models/user.rb:
class User
include Likeable::UserMethods
endFinally add Likeable module to any model you want to be liked:
class Comment
include Likeable
endIf 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
endconfig/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
endThen 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 -%>
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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Richard Schneeman for Gowalla <3
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 (c) 2011 Schneems. See LICENSE.txt for further details.
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