uuid() public

Returns the unique request id, which is based off either the X-Request-Id header that can be generated by a firewall, load balancer, or web server or by the RequestId middleware (which sets the action_dispatch.request_id environment variable).

This unique ID is useful for tracing a request from end-to-end as part of logging or debugging. This relies on the rack variable set by the ActionDispatch::RequestId middleware.

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February 12, 2016 - (<= v4.2.1)
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Generate Token

For generate a token, make this:

def generate_token
  self.token = SecureRandom.uuid

SecureRandom return a number random and the uuid make this number be unique. This a good idea for use in shopping cart, for example