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Ruby: override `new` constructor method using meta programming
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module Bar | |
module ClassMethods | |
# `new` is a class method on the `Class` object | |
# It then uses `send` to access `initialize` which would otherwise be a private instance method | |
# So it can be overridden by extending the your class with a new `new` class method | |
def new(*args, &block) | |
super | |
p "new constructor defined" | |
end | |
end | |
class << self | |
def included(klass) | |
p "#{klass} is the class that's including #{self}" | |
klass.extend(ClassMethods) | |
end | |
end | |
end | |
class Foo | |
include Bar | |
def initialize | |
p "Foo constructor" | |
end | |
end | |
Foo.new | |
# "Foo is the class that's including Bar" | |
# "Foo constructor" | |
# "new constructor defined" |
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