Rails gem for generating a unique token in an Active Record model.
This is from Railscasts episode #135 showing how to make a gem.
gem install ryanb-uniquify --source http://gems.github.com
Let's say you have a Project model with a “token” string column that you want to be a unique identifier. Just add this to your model.
class Project < ActiveRecord::Base uniquify :token end
This will generate a random and unique string before each book is created.
You can specify multiple columns ands options like this.
uniquify :token, :salt, :length => 12, :chars => 0..9
You can also pass a block to generate your own characters.
uniquify :token do rand(99999) end
If the generated value already exists, the block will be run again until the value is unique.
Copyright © 2008 Ryan Bates
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