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string to class in ruby on rails

January 26th, 2010 Comments off

There are few ways to have a class from a string, most know are:

  • Kernel.const_get(‘User’)
  • eval(‘User’)
  • ‘User’.constantize

The order in which I have named them is important – a bit important, Kernel.const_get is 10 times faster then constantize and 5 times faster then eval.

The reason of such speed for Kernel.const_get is from it has to maintain list of all constants in the application, tests show it may even behave faster then storing names and Class mapping in a hash.

The difference is not big on simple calls to create just one or two classes, but on heavy loaded systems this might give some more percents of the hardware.

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