AssociationCount Build Status

A small gem for ActiveRecord that allows association counts to be included in your base query.

Installation

Add this line to your application's Gemfile:

gem 'association_count'

And then execute:

$ bundle

Or install it yourself as:

$ gem install association_count

Usage

Include in specific model

Simply add

class Post < ApplicationRecord
  extend AssociationCount

  # [...]
end

Include in all models

Rails 5, add it to ApplicationRecord

class ApplicationRecord < ActiveRecord::Base
  self.abstract_class = true
  # [...]
  extend AssociationCount
end

Rails 4, add it to ActiveRecord::Base

ActiveRecord::Base.extend AssociationCount

class Foo < ActiveRecord::Base
  has_many  :bars
  can_count :bars
end

class Bar < ActiveRecord::Base
  belongs_to  :foo
end

# Each Foo instance will come with a "preloaded" count method: bar_count
Foo.all.include_bar_count.map(&:bar_count) # only one SQL query executed

# you can also achieve the same with
foos = Foo.all.association_count(Bar)

This works for any has_many relationship even if it uses non standard foreign keys or is a has_many :x, through: y.

By default the count will be distinct, if this is not desired use:

class Foo < ActiveRecord::Base
  has_many  :bars
  can_count :bars, distinct: false
end

Development

After checking out the repo, run bin/setup to install dependencies. Then, run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release to create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

  1. Fork it ( https://github.com/buren/association_count/fork )
  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 a new Pull Request