module ActiveSupport::Inflector

def deconstantize(path)

See also +demodulize+.

''.deconstantize # => ""
'::String'.deconstantize # => ""
'String'.deconstantize # => ""
'::Net::HTTP'.deconstantize # => "::Net"
'Net::HTTP'.deconstantize # => "Net"

Removes the rightmost segment from the constant expression in the string. 
def deconstantize(path)
  path.to_s[0...(path.rindex('::') || 0)] # implementation based on the one in facets' Module#spacename
end