A simple date validator for Rails 3. Compatible with Ruby 1.8.7, 1.9.2 and Rubinius 1.2.2.

$ gem sources -a http://gemcutter.org/
$ gem install date_validator

And I mean simple. In your model:

validates :expiration_date,
          :date => {:after => Proc.new { Time.now },
                    :before => Proc.new { Time.now + 1.year } }
# Using Proc.new prevents production cache issues

If you want to check the date against another attribute, you can pass it a Symbol instead of a block:

# Ensure the expiration date is after the packaging date
validates :expiration_date,
          :date => {:after => :packaging_date}

For now the available options you can use are :after, :before, :after_or_equal_to and :before_or_equal_to.

If you want to specify a custom message, you can do so in the options hash:

validates :start_date,
  :date => {:after => Date.today, :message => 'must be after today'},
  :on => :create

Pretty much self-explanatory! :)

If you want to make sure an attribute is before/after another attribute, use:

validates :start_date, :date => {:before => :end_date }

• Fork the project.
• Make your feature addition or bug fix.
• Add tests for it. This is important so I don't break it in a future version unintentionally.
• Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
• Send us a pull request. Bonus points for topic branches.

Copyright (c) 2011 Codegram. See LICENSE for details.