Question

How can I store a format string like this

s = "test with #{value}"

so that later on I can do this

puts s % {:value => 'hello'}

If I write the first thing, it complains that value is not found (true, I want to provide it later). If I use the raw string s = 'test with #{value}' it is not interpolated.

I specifically tried this:

@format_html = "<a href=\"http://boardgamegeek.com/user/%{who.sub ' ', '+'}\">%{who}</a> receives <a href=\"%{got[0]}\">%{got[1]}</a> from <a href=\"http://boardgamegeek.com/user/%{from.sub ' ', '+'}\">%{from}</a> and sends <a href=\"%{given[0]}\">%{given[1]}</a> to <a href=\"http://boardgamegeek.com/user/%{to.sub ' ', '+'}\">%{to}</a>"
puts @format_html % {:who   => 'who',
                        :given => 'given',
                        :from  => 'from',
                        :got   => 'got',
                        :to    => 'to'}

and I get this:

KeyError (key{who.sub ' ', '+'} not found):

Answer 1

This works only with ruby 1.9+:

s = "test with %{value}"
puts s % { value: 'hello' } # => test with hello