PROBLEM

• Merging 2 records is often needed
• Merging has many hidden & problematic aspects

SOLUTION

ActiveRecord extension that introduces a simple merging API.

• Specify associations/attributes you want to merge
• Protects from self-merges
• Keeps counters valid
• Removes merged record

INSTALL

Rails plugin

script/plugin install git://github.com/grosser/ar_merge.git

OR Gem

sudo gem install grosser-ar_merge
#require ar_merge after activerecord

USAGE

Merge from outside the model:

user.merge!(other,:attributes=>user.attributes.keys,:associations=>%w[movies friends])`

Merge from inside the model

User < ActiveRecord::Base
  def merge!(other)
    super(other,:attributes=>%w[email website])
  end
end

Merge duplicates

#merge all new users, that have the same email
User.merge_duplicates!(User.find_all_by_status('new')) , :compare=>:email)

AUTHOR

Michael Grosser
grosser dot michael ät gmail dot com