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monkey patch of the day – activesupport vs. json_pure vs. Ruby 1.8

The error:

/Library/Ruby/Gems/1.8/gems/json_pure-1.4.3/lib/json/pure/generator.rb:232:in `__send__': undefined method `except' for #<JSON::Pure::Generator::State:0x102f245b0> (NoMethodError)

The environment: Ruby 1.8.7, DataMapper, dm-types, ActiveSupport, or just

require 'json/pure'
require 'active_support'

(as seen in

My solution:

# workaround for activesupport vs. json_pure vs. Ruby 1.8 glitch
if JSON.const_defined?(:Pure)
  class JSON::Pure::Generator::State
    include ActiveSupport::CoreExtensions::Hash::Except
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