Raised by ActiveRecord::Base#save! and ActiveRecord::Base.create! methods when a record is invalid and can not be saved.

Methods
N
Attributes
[R] record
Class Public methods
new(message = nil, record = nil)

Source: show | on GitHub 

# File activerecord/lib/active_record/errors.rb, line 71
def initialize(message = nil, record = nil)
  @record = record
  super(message)
end