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

Steal from Merb:

# File merb/core_ext/hash.rb, line 87
def to_params
  params = ''
  stack = []

  each do |k, v|
    if v.is_a?(Hash)
      stack << [k,v]
    else
      params << "#{k}=#{v}&"
    end
  end

  stack.each do |parent, hash|
    hash.each do |k, v|
      if v.is_a?(Hash)
        stack << ["#{parent}[#{k}]", v]
      else
        params << "#{parent}[#{k}]=#{v}&"
      end
    end
  end

  params.chop! # trailing &
  params
end

See http://noobkit.com/show/ruby/gems/development/merb/hash/to_params.html