Not able to overwrite object properties in "create" method - ruby-on-rails-3

Question

I have a simple table for storing users accounts information (emails and passwords) with two additional columns:
is_active - says if user account is enable or disabled - the column
type is boolean and in the context of DB2 it is mapped with
decimal(1)
registration_date - says when the user was created - the column
type is datetime and in the context ofDB2 it is mapped with
datetime
As this fields will not be set by the user, I have deleted their inputs from the users _form.
I want to populated this fields in my users controller as follows:
def create
#security_user = SecurityUser.new(params[:security_user])
#security_user.is_active = 0
#security_user.registration_date = DateTime.now
...
end
But I can not pass the validations that I have in the model. They looks like:
class SecurityUser < ActiveRecord::Base
# Loading custom validators
require 'lib/date_format_validator'
...
# Accessible columns
...
# Relationships
...
# Validations
validates :is_active, inclusion: { in: 0..1, message: "only '0' and '1' allowed"}, presence: true
validates :registration_date, date_format:true , presence: true
end
where the 'lib/date_format_validator' looks like follows:
class DateFormatValidator < ActiveModel::EachValidator
def validate_each(object, attribute, value)
if (DateTime.parse(value) rescue ArgumentError) == ArgumentError
object.errors[attribute] << (options[:message] || "is not valid datetime")
end
end
end
What I am doing wrong?
EDIT: The screenshot below displays the errors:
EDIT2: Sam Ruby's answer helps me to finish with something like this for my custom validator method:
class DateFormatValidator < ActiveModel::EachValidator
def validate_each(object, attribute, value)
unless value.kind_of? DateTime || (DateTime.parse(value) rescue ArgumentError) != ArgumentError
object.errors[attribute] << (options[:message] || "is not valid datetime")
end
end
end
and to transform the validates method for the is_active column as follows:
validates :is_active, inclusion: { in: [ true, false ], message: "only 'true' and 'false' allowed"}
because as it is said in the official documentation:
Since false.blank? is true, if you want to validate the presence of a boolean field you should use validates :field_name, :inclusion => { :in => [true, false] }.

Answer 1

The problem is that you are trying to validate the ActiveRecord object as if the columns are of type String. But since you have defined your columns as boolean and datetime, what you will be validating will be of type TrueClass, FalseClass or ActiveSupport::TimeWithZone.
In other words, the values are already parsed.
true is never 0 or 1.
DateTime.parse(DateTime.now) will always raise ArgumentError
If you want to validate the unparsed values, do so in the controller.