aupajo.rb

def changes
  @changes ||= created_changes + updated_changes + deleted_changes
end

def created_changes
  changes_for created_fields, :created
end

def updated_changes
  changes_for updated_fields, :updated
end

def deleted_changes
  changes_for deleted_fields, :deleted
end

def changes_for(fields, status)
  fields.map { |field_name| Change.new(field_name, status) }
end