Given a class A and a module B, mixin the instance methods of B so that it overrides the correspnding instance methods of A.
module B
def method1
"B\#method1"
end
def method2
"B\#method2"
end
end
class A
def method1
"A\#method1"
end
def method2
"A\#method2"
end
# include B does not override instance methods!
# (module gets mixed into the superclass)
end
puts A.new.method1 # want it to print out "B#method1"
puts A.new.method2 # want it to print out "B#method2"
You could remove each of B
's methods from A
before including B
.
class A
def method1
"A\#method1"
end
def method2
"A\#method2"
end
B.instance_methods(false).each { |method|
remove_method(method) if instance_methods(false).include?(method)
}
include B
end
Or from within B
:
module B
def method1
"B\#method1"
end
def method2
"B\#method2"
end
def self.append_features(mod)
instance_methods(false).each { |method|
mod.send(:remove_method, method) if mod.instance_methods(false).include?(method)
}
super
end
end