1  module ActiveSupport #:nodoc:
   2    module CoreExtensions #:nodoc:
   3      module Hash #:nodoc:
   4        # Allows for deep merging
   5        module DeepMerge
   6          # Returns a new hash with +self+ and +other_hash+ merged recursively.
   7          def deep_merge(other_hash)
   8            self.merge(other_hash) do |key, oldval, newval|
   9              oldval = oldval.to_hash if oldval.respond_to?(:to_hash)
  10              newval = newval.to_hash if newval.respond_to?(:to_hash)
  11              oldval.class.to_s == 'Hash' && newval.class.to_s == 'Hash' ? oldval.deep_merge(newval) : newval
  12            end
  13          end
  14 
  15          # Returns a new hash with +self+ and +other_hash+ merged recursively.
  16          # Modifies the receiver in place.
  17          def deep_merge!(other_hash)
  18            replace(deep_merge(other_hash))
  19          end
  20        end
  21      end
  22    end
  23  end