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cannikin/rails_version.rb

Last active February 16, 2018 19:10
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Two different forms of `include` in Ruby, only one of which works as expected
Raw
rails_version.rb
class BustedInclude
include ActiveModel::Validations, ActiveModel::Validations::Callbacks
before_validation { puts 'Callback!' }
end
# outputs only `true`
instance = BustedInclude.new
instance.valid?
class WorkingInclude
include ActiveModel::Validations
include ActiveModel::Validations::Callbacks
before_validation { puts 'Callback!' }
end
# outputs "Callback!" and then `true`
instance = WorkingInclude.new
instance.valid?
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