Ruby on Rails

# Injector declaration

jack :StringRefinements do
lets String do # Our re-classing
with singleton_class do
def new *args, &code
super(*args, &code) + ' is a special string'
end
end
end
end

class OurClass
include StringRefinements()

def foo_bar
String('foo and bar')
end
end

c = OurClass.new
c.foo_bar.class.should == String
c.foo_bar.should == 'foo and bar is a special string'

StringRefinements do
String() do # Adding more stuff
def extra
:extra
end
end
end

c.foo_bar.should == 'foo and bar is a special string'
c.foo_bar.extra.should == :extra

SR = StringRefinements do
lets String do # New Version
def to_s
super + '****'
end
end
end

# c is still the same

c.foo_bar.should == 'foo and bar is a special string'
c.foo_bar.extra.should == :extra


class OurOtherClass
include SR # Another class application


def foo_bar
String('foo and bar')
end
end

d = OurOtherClass.new

d.foo_bar.to_s.should == 'foo and bar****'
expect{ d.extra }.to raise_error(NoMethodError)

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