ActiveRecord::Denormalize

Denormalize fields in ActiveRecord.

Installation

Add this line to your application's Gemfile:

gem 'activerecord-denormalize'

And then execute:

$ bundle

Or install it yourself as:

$ gem install activerecord-denormalize

Usage

class Message < ActiveRecord::Base
  # sender_type:string, sender_id:integer, _sender:hstore

  belongs_to :sender, polymorphic: true
end

class User < ActiveRecord::Base
  # name:string

  has_many :messages, as: :sender, denormalize: {
    attributes: [:name]
  }
end

user    = User.create!(name: 'foo')
message = Message.create!(sender: user)

message.sender_name #=> 'foo'

user.update_attribute :name, 'bar'

message.reload
message.sender_name #=> 'bar'

Message.all.each do |msg|
  # no N+1 query
  msg.sender_name
end

Running the test

$ bundle exec rake appraisal spec

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