19 Aug '13, 6pm

Is it possible? A new post on @FunctionalRuby?! Why yes, yes it is! Thanks @twopoint718! #ruby #haskell

Hey everyone - this latest post comes from esteemed friend Chris Wilson . He has a big ol’ brain and writes about all sorts of fancy thoughts. Check him out! I hope he’ll grace our pages again, but until then, enjoy this fine piece about applying FP (arguably Haskell) style validation approaches to your once humble Rails applications. Thanks Chris! So the way that validation works in Rails has always seemed a bit weird to me. And as I learn more and more about functional programming the weirdness has become clearer. When doing validation in a rails app the flow is something like this: emp = Employee.create(firstname: Bob) emp.valid? # => false # ugh, why not? emp.errors # => {:lastname=>["can't be blank"]} emp.lastname = "Boberson" emp.valid? # => true emp.save So it goes. What is weird about this whole situation is that the information about the validity of the model has ...

Full article: http://functionalruby.com/blog/2013/08/17/applicative-val...

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