Unique Identifier
make unique identifier fields quick and simple
Installation
Add this line to your application's Gemfile:
gem 'unique_identifier'
And then execute:
$ bundle
Or install it yourself as:
$ gem install unique_identifier
Usage
class SomeModel < ActiveRecord::Base
# name of column to store unique identifier
# |
# -------
unique_id :number, -> { Array.new(9) { rand(9) }.join }
# ------------------------------------
# |
# proc to be run `before_validation, on: :create` to generate unique identifier
end
instance = SomeModel.create
instance.number # => "324516542"How it works
The above example is equivalent to this:
class SomeModel < ActiveRecord::Base
before_validation :generate_unique_id, on: :create
def generate_unique_id
self.number = loop do
random = Array.new(9) { rand(9) }.join
break random unless self.class.exists?(number: random)
end
end
endContributing
- Fork it
- Create your feature branch (
git checkout -b my-new-feature) - Commit your changes (
git commit -am 'Add some feature') - Push to the branch (
git push origin my-new-feature) - Create new Pull Request