How to validate the date such that it is after today in Rails?

Question

I have an Active Record model that contains attributes: expiry_date. How do I go about validating it such that it is after today(present date at that time)? I am totally new to Rails and ruby and I couldn't find a similar question answering exactly this?

I am using Rails 3.1.3 and ruby 1.8.7

Answer 1

Your question is (almost) exactly answered in the Rails guides.

Here's the example code they give. This class validates that the date is in the past, while your question is how to validate that the date is in the future, but adapting it should be pretty easy:

class Invoice < ActiveRecord::Base   validate :expiration_date_cannot_be_in_the_past    def expiration_date_cannot_be_in_the_past     if expiration_date.present? && expiration_date < Date.today       errors.add(:expiration_date, "can't be in the past")     end   end     end 

Answer 2

Here's the code to set up a custom validator:

#app/validators/not_in_past_validator.rb class NotInPastValidator < ActiveModel::EachValidator   def validate_each(record, attribute, value)     if value.blank?       record.errors.add attribute, (options[:message] || "can't be blank")     elsif value <= Time.zone.today       record.errors.add attribute,                         (options[:message] || "can't be in the past")     end   end end 

And in your model:

validates :signed_date, not_in_past: true