Understanding [ClassOne, ClassTwo].each(&:my_method) [duplicate]
Solution 1:
This relies upon a Ruby 1.9 extension that can be done in 1.8 by including the following:
class Symbol
def to_proc
proc { |obj, *args| obj.send(self, *args) }
end
end
I believe Rails defines this in ActiveSupport.
Solution 2:
It's some Rails specific patching of Ruby, symbol to proc.