Talking head
RailsConf 2017

This presentation, by Justin Weiss, is licensed under a Creative Commons Attribution ShareAlike 3.0
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What if your Rails app couldn’t tell who was visiting it? If you had no idea that the same person requested two different pages? If all the data you stored vanished as soon as you returned a response? The session is the perfect place to put this kind of data. But sessions can be a little magical. What is a session? How does Rails know to show the right data to the right person? And how do you decide where you keep your session data?

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