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Do you really know public, private and protected in Ruby?

Public, private and protected access - all of the programmers are familiar with that concept. Nothing special, we work with them on a daily basis. However, as Ruby programmers, do we really know the details?
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Ruby on Rails - how to create perfect enum in 5 steps

When your project starts you probably design ERD diagram or a similar one. Then, each time when a client passes new requirements to you it’s necessary to modify it. That process helps to understand the specific domain and mirrors the reality.
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