ActiveSupport::Deprecation::DeprecatedObjectProxy

DeprecatedObjectProxy transforms an object into a deprecated one. It takes an object, a deprecation message and optionally a deprecator. The deprecator defaults to ActiveSupport::Deprecator if none is specified.

deprecated_object = ActiveSupport::Deprecation::DeprecatedObjectProxy.new(Object.new, "This object is now deprecated")
# => #<Object:0x007fb9b34c34b0>

deprecated_object.to_s
DEPRECATION WARNING: This object is now deprecated.
(Backtrace)
# => "#<Object:0x007fb9b34c34b0>"
Methods
N
Class Public methods
new(object, message, deprecator = ActiveSupport::Deprecation.instance)

Source: show | on GitHub 

# File activesupport/lib/active_support/deprecation/proxy_wrappers.rb, line 41
def initialize(object, message, deprecator = ActiveSupport::Deprecation.instance)
  @object = object
  @message = message
  @deprecator = deprecator
end