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DeprecatedObjectProxy transforms an object into a deprecated one. It takes an object, a deprecation message, and a deprecator.

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

Source: show | on GitHub 

# File activesupport/lib/active_support/deprecation/proxy_wrappers.rb, line 39
def initialize(object, message, deprecator = nil)
  @object = object
  @message = message
  ActiveSupport.deprecator.warn("DeprecatedObjectProxy without a deprecator is deprecated") unless deprecator
  @deprecator = deprecator || ActiveSupport::Deprecation._instance
end