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Behavior module allows to determine how to display deprecation messages. You can create a custom behavior or set any from the DEFAULT_BEHAVIORS constant. Available behaviors are:

raise

Raise ActiveSupport::DeprecationException.

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. On Rails, set config.active_support.report_deprecations = false to disable all behaviors.

Setting behaviors only affects deprecations that happen after boot time. For more information you can read the documentation of the behavior= method.

Methods
B
D

Attributes

[RW] debug

Whether to print a backtrace along with the warning.

Instance Public methods

behavior()

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

Source: show 

# File activesupport/lib/active_support/deprecation/behaviors.rb, line 67
def behavior
  @behavior ||= [DEFAULT_BEHAVIORS[:stderr]]
end

behavior=(behavior)

Sets the behavior to the specified value. Can be a single value, array, or an object that responds to call.

Available behaviors:

raise

Raise ActiveSupport::DeprecationException.

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.

deprecator = ActiveSupport::Deprecation.new
deprecator.behavior = :stderr
deprecator.behavior = [:stderr, :log]
deprecator.behavior = MyCustomHandler
deprecator.behavior = ->(message, callstack, deprecation_horizon, gem_name) {
  # custom stuff
}

If you are using Rails, you can set config.active_support.report_deprecations = false to disable all deprecation behaviors. This is similar to the silence option but more performant.

Source: show 

# File activesupport/lib/active_support/deprecation/behaviors.rb, line 101
def behavior=(behavior)
  @behavior = Array(behavior).map { |b| DEFAULT_BEHAVIORS[b] || arity_coerce(b) }
end

disallowed_behavior()

Returns the current behavior for disallowed deprecations or if one isn’t set, defaults to :raise.

Source: show 

# File activesupport/lib/active_support/deprecation/behaviors.rb, line 72
def disallowed_behavior
  @disallowed_behavior ||= [DEFAULT_BEHAVIORS[:raise]]
end

disallowed_behavior=(behavior)

Sets the behavior for disallowed deprecations (those configured by ActiveSupport::Deprecation#disallowed_warnings=) to the specified value. As with behavior=, this can be a single value, array, or an object that responds to call.

Source: show 

# File activesupport/lib/active_support/deprecation/behaviors.rb, line 109
def disallowed_behavior=(behavior)
  @disallowed_behavior = Array(behavior).map { |b| DEFAULT_BEHAVIORS[b] || arity_coerce(b) }
end