How do I dynamically invoke or call a class in Rails?

constantize fits the bill. You can read more about it here. In your case it would be something like:

(1..3).each do |n|  "MyClass#{n}".constantize.methodsend

ruby-on-rails ruby class dynamic invoke

you can also do -

(1..3).each {|n| eval "MyClass#{n}.methods"}

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