Ruby Monkey Patch Super

Until ruby 2 0 there was no way to add code below a class only above it.

Ruby monkey patch super.

This is called a monkey patch. All users of the monkey patched class see the same changes. This article looks at how to minimize the risk of opening classes alternatives and how other languages provide similar capabilities. This module is based on the wonderful monkey patch by paul driver.

Subscribe to treehouse direct for new clips episodes and more. Max spends plenty of time in his super hero outfit. Ruby s open classes are powerful but can easily be misused. Due to ruby s open classes you can redefine or add functionality to existing classes.

Ruby inheritance doesn t work that way. In the most recent ruby 2 7 upgrade at github we monkey patched warning warn to be able to turn warnings into exceptions. Watch as he helps ruby and friends. This can cause unintended side effects or breakage of programs.

Therefore a monkey patch might break code which doesn t expect the extended behavior and multiple monkey patches for the same class might cause conflicts to solve these problems refinements provide a way to extend classes locally. The knowledge gained from this adventure was totally worth it. But with prepend you can override a method in a class with a method from a module and still access the class s implementation with super. Interface to patch package is slightly different see previous item for the cause.

Monkey patching is a powerful feature of ruby however it affects globally in a program. You can monkey patch module kernel to get methods available in main. Grandma s berry patch backshall ruby wants to pick lots of berries from grandma s berry patch so grandma can make her surprise berry recipe. This module adds the ability to add replace delete subroutines instead of just wrapping them.

What changed in ruby 2 0. Although i did not create a library i would expect people to use i learned a lot about how ruby works and had a great time solving the problem.