MostRelated

most_related returns models that have the most 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 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_count

Note multiple associations do not work with sqlite.

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