A Sinatra before only filter
In a Sinatra application you can use the ‘before’ filter to run something before every each event.
before do
puts "I will run all the time..."
end
Here’s a module that will allow you to run code only before certain routes:
module Sinatra
module BeforeOnlyFilter
def before_only(routes, &block)
before do
routes.map!{|x| x = x.gsub(/\*/, '\w+')}
routes_regex = routes.map{|x| x = x.gsub(/\//, '\/')}
instance_eval(&block) if routes_regex.any? {|route| (request.path =~ /^#{route}$/) != nil}
end
end
end
register BeforeOnlyFilter
end
Use it like below, note that you insert ‘*’ for routes that use variable placeholders like ‘:id’…
before_only(['/post', '/comment/*/user/*']) do
puts "I will only run before the routes '/post' & '/comment/*/user/*'..."
end
This entry was written by
Alastair, posted on
July 27, 2010 at 2:10 pm, filed under
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