Methods
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Constants
DEFAULT_BEHAVIORS = { :stderr => Proc.new { |message, callstack| $stderr.puts(message) $stderr.puts callstack.join("\n ") if debug }, :log => Proc.new { |message, callstack| logger = if defined?(Rails) && Rails.logger Rails.logger else require 'logger' Logger.new($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) } }
 

Default warning behaviors per Rails.env.
Attributes
[RW] debug

Whether to print a backtrace along with the warning.
[RW] deprecation_horizon

The version the deprecated behavior will be removed, by default.
[RW] silenced
Class Public methods
behavior()

Returns the set behavior or if one isn’t set, defaults to :stderr

Source: show 

# File activesupport/lib/active_support/deprecation/behaviors.rb, line 11
def behavior
  @behavior ||= [DEFAULT_BEHAVIORS[:stderr]]
end
behavior=(behavior)

Sets the behavior to the specified value. Can be a single value or an array.

Examples

ActiveSupport::Deprecation.behavior = :stderr
ActiveSupport::Deprecation.behavior = [:stderr, :log]

Source: show 

# File activesupport/lib/active_support/deprecation/behaviors.rb, line 21
def behavior=(behavior)
  @behavior = Array.wrap(behavior).map { |b| DEFAULT_BEHAVIORS[b] || b }
end
deprecate_methods(target_module, *method_names)

Declare that a method has been deprecated.

Source: show 

# File activesupport/lib/active_support/deprecation/method_wrappers.rb, line 8
    def deprecate_methods(target_module, *method_names)
      options = method_names.extract_options!
      method_names += options.keys

      method_names.each do |method_name|
        target_module.alias_method_chain(method_name, :deprecation) do |target, punctuation|
          target_module.module_eval("            def #{target}_with_deprecation#{punctuation}(*args, &block)
              ::ActiveSupport::Deprecation.warn(
                ::ActiveSupport::Deprecation.deprecated_method_warning(
                  :#{method_name},
                  #{options[method_name].inspect}),
                caller
              )
              send(:#{target}_without_deprecation#{punctuation}, *args, &block)
            end
", __FILE__, __LINE__ + 1)
        end
      end
    end
deprecated_method_warning(method_name, message = nil)

Source: show 

# File activesupport/lib/active_support/deprecation/reporting.rb, line 25
def deprecated_method_warning(method_name, message = nil)
  warning = "#{method_name} is deprecated and will be removed from Rails #{deprecation_horizon}"
  case message
    when Symbol then "#{warning} (use #{message} instead)"
    when String then "#{warning} (#{message})"
    else warning
  end
end
silence()

Silence deprecation warnings within the block.

Source: show 

# File activesupport/lib/active_support/deprecation/reporting.rb, line 18
def silence
  old_silenced, @silenced = @silenced, true
  yield
ensure
  @silenced = old_silenced
end
warn(message = nil, callstack = caller)

Outputs a deprecation warning to the output configured by ActiveSupport::Deprecation.behavior

ActiveSupport::Deprecation.warn("something broke!")
# => "DEPRECATION WARNING: something broke! (called from your_code.rb:1)"

Source: show 

# File activesupport/lib/active_support/deprecation/reporting.rb, line 10
def warn(message = nil, callstack = caller)
  return if silenced
  deprecation_message(callstack, message).tap do |m|
    behavior.each { |b| b.call(m, callstack) }
  end
end