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require 'active_support/json/variable'
require 'active_support/json/encoders/object' # Require explicitly for rdoc.
Dir["#{File.dirname(__FILE__)}/encoders/**/*.rb"].each do |file|
basename = File.basename(file, '.rb')
unless basename == 'object'
require "active_support/json/encoders/#{basename}"
end
end
module ActiveSupport
module JSON
class CircularReferenceError < StandardError
end
class << self
REFERENCE_STACK_VARIABLE = :json_reference_stack #:nodoc:
# Converts a Ruby object into a JSON string.
def encode(value, options = {})
raise_on_circular_reference(value) do
value.send(:to_json, options)
end
end
protected
def raise_on_circular_reference(value) #:nodoc:
stack = Thread.current[REFERENCE_STACK_VARIABLE] ||= []
raise CircularReferenceError, 'object references itself' if
stack.include? value
stack << value
yield
ensure
stack.pop
end
end
end
end