How to call methods dynamically based on their name? [duplicate]

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What you want to do is called dynamic dispatch. It’s very easy in Ruby, just use public_send:

method_name="foobar"
obj.public_send(method_name) if obj.respond_to? method_name

If the method is private/protected, use send instead, but prefer public_send.

This is a potential security risk if the value of method_name comes from the user. To prevent vulnerabilities, you should validate which methods can be actually called. For example:

if obj.respond_to?(method_name) && %w[foo bar].include?(method_name)
  obj.send(method_name)
end

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