Module: ARMerge::InstanceMethods

Defined in:
lib/ar_merge.rb

Instance Method Summary collapse

Instance Method Details

#merge!(other, options = {}) ⇒ Object 



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# File 'lib/ar_merge.rb', line 6

def merge!(other, options={})
  raise "cannot merge wit a new record" if other.new_record?
  raise "cannot merge with myself" if other == self

  #merge associations
  (options[:associations]||[]).each do |association_name|
    send(association_name).concat other.send(association_name)

    if ActiveRecord::VERSION::MAJOR < 4
      #update counters, this is very basic/hacky/not secure for customized counters...
      counter = "#{association_name}_count"
      next unless other.respond_to?(counter) and respond_to?("#{counter}=")
      self.class.update_counters(id, counter => other.send(counter))
    end
  end

  #merge attributes
  (options[:attributes]||[]).each do |attr|
    send("#{attr}=", other.send(attr)) if send(attr).blank?
  end

  #cleanup
  other.reload.destroy
  save!
end