Partisan is a Ruby library that allows ActiveRecord records to follow other records.

It’s heavily inspired by acts_as_follower. However, it’s not 100% compatible with acts_as_follower as I removed some “features”:

• Block a follower
• Methods that returned mixed types of followers/following
• *_count methods (see the new features list)

But I also added awesome new ones:

• You can use following_team_ids but also following_team_names (basically any following_team_<column>s). It takes advantage of the pluck method, so it doesn’t create an instance of each follower, it just return the relevant column values. (Go check pluck documentation, it’s simply awesome).
• The follows and followings methods now return an ActiveRecord::Relation for easy chaining, scoping, counting, pagination, etc.

Add this line to your application’s Gemfile:

gem 'partisan'

And then execute

$ bundle

Run the migration to add the follows table and the Follow model:

$ rails generate partisan:install

Create a couple of models.

class Fan < ActiveRecord::Base
  acts_as_follower
end

class Band < ActiveRecord::Base
  acts_as_followable
end

class Follow < ActiveRecord::Base
  acts_as_follow
end

And follow/unfollow other records!

fan = Fan.find(1)
band = Band.find(2)

fan.follow(band)
fan.following_bands
# => [<Band id=2>]

band.fan_followers
# => [<Fan id=1>]

fan.follows?(band)
# => true

fan.unfollow(band)
fan.follows?(band)
# => false

Most of the times, you would want to get a quick look at about how many fans follow a certain resource. That could be an expensive operation.

However, if the followed record has a followers_count column, Partisan will populate its value with how many followers the record has.

fan.follow(band)

band.followings.count
# SQL query that counts records and returns `1`

band.followers_count
# Quick lookup into the column and returns `1`

The same concept applies to followable with a followings_count column.

You can define callbacks that will be triggered before or after a following relationship is created.

If a before_follow callback returns false, it will halt the call and the relationship will be not be saved (much like ActiveRecords’s before_save callbacks).

class Fan < ActiveRecord::Base
  acts_as_follower
  after_follow :send_notification

  def send_notification
    puts "#{self} is now following #{self.just_followed}"
  end
end

class Band < ActiveRecord::Base
  acts_as_followable
  before_follow :ensure_active_fan

  def ensure_active_fan
    self.about_to_be_followed_by.active?
  end
end

The available callbacks are:

• @simonprev
• @remiprev
• @jdurand

Partisan is © 2013-2016 Mirego and may be freely distributed under the New BSD license. See the LICENSE.md file.

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