ruby sinatra如何使用正则表达式重定向

Question

I am trying to move stuff at root to /en/ directory to make my little service multi-lingual.

So, I want to redirect this url

mysite.com/?year=2018

to

mysite.com/en/?year=2018

My code is like

get %r{^/(\\?year\\=\\d{4})$} do |c| redirect "/en/#{c}" end

but it seems like I never get #{c} part from the url.

Why is that? or are there just better ways to do this?

Thanks!

Answer 1

You can use the request.path variable to get the information you're looking for.

For example,

get "/something" do
  puts request.path # => "/something"
  redirect "/en#{request.path}"
end

However if you are using query parameters (ie ?yeah=2000 ) you'll have to manually pass those off to the redirect route.

Kind of non-intuitively, there's a helper method for this in ActiveRecord.

require 'active_record'
get "/something" do
  puts params.to_param
  # if params[:year] is 2000, you'll get "year=2000"

  redirect "/en#{request.path}?#{params.to_param}"
end

You could alternatively write your own helper method pretty easily:

def hash_to_param_string(hash)
  hash.reduce("") do |string, (key, val)|
    string << "#{key}=#{val}&"
  end
end

puts hash_to_param_string({key1: "val1", key2: "val2"})
# => "key1=val1&key2=val2"