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Deprecation specifies the API used by Rails to deprecate methods, instance variables, objects and constants.

Included Modules
DEFAULT_BEHAVIORS = { raise: ->(message, callstack, deprecation_horizon, gem_name) { e = DeprecationException.new(message) e.set_backtrace(callstack.map(&:to_s)) raise e }, stderr: ->(message, callstack, deprecation_horizon, gem_name) { $stderr.puts(message) $stderr.puts callstack.join("\n ") if debug }, log: ->(message, callstack, deprecation_horizon, gem_name) { logger = if defined?(Rails.logger) && Rails.logger Rails.logger else require "active_support/logger" ActiveSupport::Logger.new($stderr) end logger.warn message logger.debug callstack.join("\n ") if debug }, notify: ->(message, callstack, deprecation_horizon, gem_name) { notification_name = "deprecation.#{gem_name.underscore.tr('/', '_')}" ActiveSupport::Notifications.instrument(notification_name, message: message, callstack: callstack, gem_name: gem_name, deprecation_horizon: deprecation_horizon) }, silence: ->(message, callstack, deprecation_horizon, gem_name) { }, }

Default warning behaviors per Rails.env.

[RW] deprecation_horizon

The version number in which the deprecated behavior will be removed, by default.

Class Public methods
new(deprecation_horizon = "6.2", gem_name = "Rails")

It accepts two parameters on initialization. The first is a version of library and the second is a library name.

ActiveSupport::Deprecation.new('2.0', 'MyLibrary')
# File activesupport/lib/active_support/deprecation.rb, line 41
def initialize(deprecation_horizon = "6.2", gem_name = "Rails")
  self.gem_name = gem_name
  self.deprecation_horizon = deprecation_horizon
  # By default, warnings are not silenced and debugging is off.
  self.silenced = false
  self.debug = false
  @silenced_thread = Concurrent::ThreadLocalVar.new(false)
  @explicitly_allowed_warnings = Concurrent::ThreadLocalVar.new(nil)