validates_duplicity_of

ActiveRecord (>= 3.2) callback which handle the name duplication in your model with ease. Ruby 2 only!

Example:

Untitled File > Untitled File (1) > Untitled File (2) ...

Add this line to your application's Gemfile:

gem 'validates_duplicity_of'

And then execute:

$ bundle

Or install it yourself as:

$ gem install validates_duplicity_of

Use the method validates_duplicity_of with an attribute in your Rails model. The scope is optional.

class Post < ActiveRecord::Base
  validates_duplicity_of :name
end

post = Post.create name: "Foo"
post.name
=> "Foo"

post = Post.create name: "Foo"
post.name
=> "Foo (1)"

class Note < ActiveRecord::Base
  validates_duplicity_of :title, scope: :user_id
end

note = Note.create title: "Bar", user_id: 1
note.title
=> "Bar"

note = Note.create title: "Bar", user_id: 1
note.title
=> "Bar (1)"

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/madwork/validates_duplicity_of.

The gem is available as open source under the terms of the MIT License.