What does session and cookies represent in ruby on rails?


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Explain the role of sub directory app/controllers and app/helpers.

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let me know what is ruby software and where and when it is usefull. Is it usefull to data base developer, if yes...where? thank you

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what is Rails Active Record in Ruby on Rails?

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Write the command to update rvm in rails.

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what is ORM (Object-Relationship-Model) in Rails?

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