module ActiveRecord::Persistence::ClassMethods

multiple objects when given an Array of Hashes.
These describe which attributes to be created on the object, or
The +attributes+ parameter can be either a Hash or an Array of Hashes.

unlike Base#create.
if validations pass. Raises a RecordInvalid error if validations fail,
Creates an object (or multiple objects) and saves it to the database,

def create!(attributes = nil, &block)
  if attributes.is_a?(Array)
    attributes.collect { |attr| create!(attr, &block) }
  else
    object = new(attributes, &block)
    object.save!
    object
  end
end