require "active_support/notifications" module ActiveSupport class Deprecation # Default warning behaviors per Rails.env. DEFAULT_BEHAVIORS = { :stderr => Proc.new { |message, callstack| $stderr.puts(message) $stderr.puts callstack.join("\n ") if debug }, :log => Proc.new { |message, callstack| logger = if defined?(Rails) && Rails.logger Rails.logger else require 'active_support/logger' ActiveSupport::Logger.new($stderr) end logger.warn message logger.debug callstack.join("\n ") if debug }, :notify => Proc.new { |message, callstack| ActiveSupport::Notifications.instrument("deprecation.rails", :message => message, :callstack => callstack) }, :silence => Proc.new { |message, callstack| } } module Behavior # Whether to print a backtrace along with the warning. attr_accessor :debug # Returns the current behavior or if one isn't set, defaults to +:stderr+ def behavior @behavior ||= [DEFAULT_BEHAVIORS[:stderr]] end # Sets the behavior to the specified value. Can be a single value, array, or # an object that responds to +call+. # # Available behaviors: # # [+stderr+] Log all deprecation warnings to +$stderr+. # [+log+] Log all deprecation warnings to +Rails.logger+. # [+notify+] Use +ActiveSupport::Notifications+ to notify +deprecation.rails+. # [+silence+] Do nothing. # # Setting behaviors only affects deprecations that happen after boot time. # Deprecation warnings raised by gems are not affected by this setting because # they happen before Rails boots up. # # ActiveSupport::Deprecation.behavior = :stderr # ActiveSupport::Deprecation.behavior = [:stderr, :log] # ActiveSupport::Deprecation.behavior = MyCustomHandler # ActiveSupport::Deprecation.behavior = proc { |message, callstack| # # custom stuff # } def behavior=(behavior) @behavior = Array(behavior).map { |b| DEFAULT_BEHAVIORS[b] || b } end end end end