Do your users want to add food, drinks, books, movies, and many other stuff to favorites?

— How should I name this table — users_foods or foods_users?
— Damn, I forget to add :id => false to migration again!
— Holy sh*t! I have to create a lot of tables for this relations!

Nope, you don't have to create relations or think about migrations — markable will handle this.

Should your users be able to add each other to friends? Or do you want to make a twitter-like followers system?

— Oh… Self-relation again…

Nope, markable can handle it too!

##Installation

Add to your Gemfile

gem 'markable'

Run

bundle install
rails generate markable:migration
rake db:migrate

##Upgrade

If you are upgrading from version 0.1.0 or less, run

rake markable:delete_orphan_marks

At first you should define markers — these are models which will mark other models.

If User can mark Food as favorite, then User — is a marker.

class User < ActiveRecord::Base
  acts_as_marker
end

Then you should define markables

class Food < ActiveRecord::Base
  markable_as :favorite
end

Thats it! Now you can mark pizza as a favorite food of your user

user.set_mark :favorite, pizza
# or
user.mark_as_favorite pizza
# or
user.favorite_foods << pizza

— Also I hate broccoli!

As you wish! Just a little change to your Food model

class Food < ActiveRecord::Base
  markable_as [ :hated, :favorite ]
  # or
  markable_as :hated, :favorite
end

and The World will know, what kind of food do you hate.

user.hated_foods << broccoli

You can easily get list of all food marked as favorite by your user

user.foods_marked_as :favorite
# or
user.foods_marked_as_favorite
# or
user.favorite_foods

Also you can get a list of all users, who loves pizza too!

pizza.users_have_marked_as :favorite
# or
pizza.users_have_marked_as_favorite

And all food loved by users

Food.marked_as :favorite
# or
Food.marked_as_favorite

— Hmm… What kind of food my friends likes?

Food.marked_as_favorite :by => [ user1, user2, user3 ]

— Hey! I have found a users who loves pizza too — I want to be friends with them!

No problem! Just make User markable as friendly!

class User < ActiveRecord::Base
  acts_as_marker
  markable_as :friendly, :by => :user
end

And now you can add all pizza-lovers to your friends

user.friendly_users << pizza.users_have_marked_as_favorite

Piece of cake!

class User < ActiveRecord::Base
  acts_as_marker
end
class Food < ActiveRecord::Base
  markable_as :favorite
end

# Getters
user.favorite_foods # => [food1, food2, …]
user.foods_marked_as :favorite # => [food1, food2, …]
user.foods_marked_as_favorite # => [food1, food2, …]

food.users_have_marked_as :favorite # => [user1, user2, …]
food.users_have_marked_as_favorite # => [user1, user2, …]

Food.marked_as :favorite # => [food1, food2, …]
Food.marked_as :favorite, :by => user1 # => [food1, food2, …]
Food.marked_as_favorite # => [food1, food2, …]
Food.marked_as_favorite :by => user1 # => [food1, food2, …]

# Setters
user.favorite_foods << [food1, food2]
user.foods_marked_as(:favorite) << [food1, food2]
user.foods_marked_as_favorite << [food1, food2]
user.mark_as_favorite [food1, food2]
user.set_mark :favorite, [food1, food2]

food.users_have_marked_as(:favorite) << [user1, user2]
food.users_have_marked_as_favorite << [user1, user2]
food.mark_as :favorite, [user1, user2]

# Removals
food.unmark :favorite
food.unmark :favorite, :by => user1
food.users_have_marked_as(:favorite).delete [food1, food2]
food.users_have_marked_as_favorite.delete [food1, food2]
user.remove_mark :favorite, [food1, food2]
user.favorite_foods.delete [food1, food2]

# Check
food.marked_as? :favorite
food.marked_as? :favorite, :by => user1
food.marked_as_favorite?
food.marked_as_favorite? :by => user1

##Usage examples

You can find some usage examples at wiki page: Usage examples

The MIT License

Copyright (c) 2012 Alex Chrome

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.