you could create a method called
def leading_zeros(number)
"%05d" % number
end
and then call it
"#{leading_zeros order.id}#{order.name}"
What you have with ""#{order.id}".leading_zeros
is that #{order.id} will evaluate to a string and then you are trying to
call the leading_zeros method on the string. For it to work as you intend
leading_zeros needs to be part of the String class.
There is no end of pain in doing this.
Just save leading_zeros as a helper method in the application helps and call
it as I have shown.
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