MostRelated

most_related returns models that have the most many to many associated models in common

Installation

Add this line to your application's Gemfile:

gem 'most_related'

And then execute:

$ bundle

Or install it yourself as:

$ gem install most_related

Usage

Post example

class Post < ActiveRecord::Base
  has_most_related :authors
  has_most_related :tags, as: :most_related_by_tags
  has_most_related [:authors, :tags], as: :most_related_by_author_or_tag

  has_many :author_posts
  has_many :authors, through: :author_posts
end

class Author < ActiveRecord::Base
  has_many :author_posts
end

class AuthorPosts < ActiveRecord::Base
  belongs_to :author
  belongs_to :post
end

To return the posts with the most authors in common with post, in descending order:

post.most_related

To return the posts with the most tags in common with post, in descending order:

post.most_related_by_tag

To return the posts with the most authors and tags in common with post, in descending order:

post.most_related_by_author_or_tag

The count of the many to many associated models in common is accessible on each returned model

post.most_related_count
post.most_related_by_tag_count
post.most_related_by_author_or_tag

If multiple many to many associations are used, the syntax is specific to MySql.

Because of the use of 'group', pagination is not supported.

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request