class ActiveRecord::RecordNotSaved

Raised by ActiveRecord::Base#save! and ActiveRecord::Base.update_attribute! methods when a record failed to validate or cannot be saved due to any of the before_* callbacks throwing :abort. See ActiveRecord::Callbacks for further details.

class Product < ActiveRecord::Base
  before_save do
    throw :abort if price < 0
  end
end

Product.create! # => raises an ActiveRecord::RecordNotSaved

# File activerecord/lib/active_record/errors.rb, line 164
def initialize(message = nil, record = nil)
  @record = record
  super(message)
end