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#97: Schemaless Form Validations with Changesets

In episode #96 we added a contact form to our application that sends an email when it’s submitted. Currently we are doing any validation on this form. So someone could submit an empty form - and it would still send an email. Let’s add some validation to this form so that a valid email is required and a message is present.

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#109: DynamicSupervisor and Registry

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#108: Shopping Cart Part 2

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