
# == Schema Information
#
# Table name: users
#
#  id                       :bigint           not null, primary key
#  birth_date               :date             not null

class User < ApplicationRecord
end

# Valid Date
# type casted 
# be Date
User.new(birth_date: "19800229").birth_date
# => Fri, 29 Feb 1980

# valid Date
# before Type Casted
# be String
User.new(birth_date: "19800229").birth_date_before_type_cast
# => "19800229"

# Invalid Date
# type casted 
# be nil
User.new(birth_date: "19800230").birth_date

# Invalid Date
# Get not type casted input 
User.new(birth_date: "19800230").birth_date_before_type_cast
# => "19800230"

Other methods

User.new.methods.grep /birth_date/
=> [:birth_date=,
 :birth_date,
 :birth_date?,
 :birth_date_changed?,
 :birth_date_change,
 :birth_date_will_change!,
 :birth_date_was,
 :birth_date_previously_changed?,
 :birth_date_previous_change,
 :restore_birth_date!,
 :saved_change_to_birth_date?,
 :birth_date_before_last_save,
 :saved_change_to_birth_date,
 :birth_date_change_to_be_saved,
 :will_save_change_to_birth_date?,
 :birth_date_in_database,
 :birth_date_before_type_cast]

Original by Github issue

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