Remember that your controller actions share the same method space with private methods defined in ActionController::Base. If your controller behaves in super-weird ways, check that you don't overwrite some internal method with a controller action.

Rails Long Term Support

Rails LTS provides security patches for old versions of Ruby on Rails (2.3, 3.2, 4.2 and 5.2)

• Prevents you from data breaches and liability risks
• Upgrade at your own pace
• Works with modern Rubies

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