Module: AR_Merge::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 8

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|
    other.send(association_name).each do |object|
      send(association_name).concat object
    end
    
    #update counters, this is very basic/hacky/not secure for customized counters...
    counter = "#{association_name}_count"
    if other.respond_to?(counter)
      other.send(counter).times{self.class.increment_counter(counter, id)}
    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