Exception Swallower

Occasionally, you may have a situation where you want all methods in a class to not raise a particular exception. Verbosely this can be accomplished with:

class Foo
  class PopGoesTheWeasel < StandardError; end

  def self.class_method_a
  rescue PopGoesTheWeasel
  end

  def self.class_method_b
  rescue PopGoesTheWeasel
  end

  def instance_method_a
  rescue PopGoesTheWeasel
  end

  def instance_method_b
  rescue PopGoesTheWeasel
  end
end

This differs from something like active_support #rescue_from as it is intended to do nothing with the exceptions and return nil (swallowed).

Installation

Add this line to your application's Gemfile:

gem 'exception_swallower'

And then execute:

$ bundle

Or install it yourself as:

$ gem install exception_swallower

Usage

include the module in any classes you want to be able to swallow exceptions:

class Foo
  include exception_swallower
  ...
end

Once included, you can define an array of exceptions you'd like swallowed for all methods (both class and instance) within the class:

class Foo
  class ExceptionA < StandardError; end
  class ExceptionB < StandardError; end

  include exception_swallower
  swallow_exceptions ExceptionA, ExceptionB
end

When any of these exceptions are raised within a method, they will automatically be rescued and swallowed:

class Foo
  class ExceptionA < StandardError; end
  class ExceptionB < StandardError; end

  include exception_swallower
  swallow_exceptions ExceptionA, ExceptionB

  def self.my_method
    puts "it's working!"
    raise ExceptionA
  end
end

Foo.my_method #=> "it's working!"