Ruby: How to turn a hash into HTTP parameters?

Question

That is pretty easy with a plain hash like

{:a => \"a\", :b => \"b\"} 

which would translate into

\"a=a&b=b\"
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Answer 1

For basic, non-nested hashes, Rails/ActiveSupport has Object#to_query.

>> {:a => "a", :b => ["c", "d", "e"]}.to_query
=> "a=a&b%5B%5D=c&b%5B%5D=d&b%5B%5D=e"
>> CGI.unescape({:a => "a", :b => ["c", "d", "e"]}.to_query)
=> "a=a&b[]=c&b[]=d&b[]=e"

http://api.rubyonrails.org/classes/Object.html#method-i-to_query