Module: ModelHistory::Mixin::ClassMethods

Defined in:
lib/model_history/model_history_mixin.rb

Instance Method Summary collapse

Instance Method Details

#creates_model_history ⇒ Object

has_model_history



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# File 'lib/model_history/model_history_mixin.rb', line 62

def creates_model_history 
  # Mix in the module, but ensure to do so just once.
  metaclass = (class << self; self; end)
  return if metaclass.included_modules.include?(ModelHistory::Mixin::CreatorInstanceMethods)

  has_many :model_history_records, :as => :creator
  
  include ModelHistory::Mixin::CreatorInstanceMethods
end

#has_model_history(*args) ⇒ Object

pass an optional proc to assign a creator to the model_history object example usage: class User < ActiveRecord::Base

has_model_history :email, :first_name, :last_name, :creator => proc { User.current_user }

end



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# File 'lib/model_history/model_history_mixin.rb', line 25

def has_model_history *args 
  # Mix in the module, but ensure to do so just once.
  metaclass = (class << self; self; end)
  return if metaclass.included_modules.include?(ModelHistory::Mixin::ObjectInstanceMethods)

  has_many        :model_history_records, :as => :model, :dependent => :destroy
  attr_accessor   :model_history_changes, :initialize_model_history
  cattr_accessor  :model_history_columns  


  self.model_history_columns ||= []
    
  if args.present?
    
    before_save     :set_model_history_changes
    after_save      :save_model_history

    args.each do |arg| 
      if [String,Symbol].include?(arg.class)     
        arg = arg.to_sym
        self.model_history_columns << arg unless self.model_history_columns.include?(arg)
        define_method "creator_for_model_history" do end
      elsif arg.is_a?(Hash)
        creator_proc = arg.delete(:creator)
        send :define_method, "creator_for_model_history" do
          begin
            creator_proc.is_a?(Proc) ? creator_proc.call : nil
          rescue
            raise ModelHistory::Mixin::CreatorProcError
          end
        end
      end
    end
    include ModelHistory::Mixin::ObjectInstanceMethods
  end
end