Convert Hash to OpenStruct recursively

You can monkey-patch the Hash class

class Hash
  def to_o
    JSON.parse to_json, object_class: OpenStruct
  end
end

then you can say

h = { a: 'a', b: 'b', c: { d: 'd', e: 'e'} }
o = h.to_o
o.c.d # => 'd'

See Convert a complex nested hash to an object.