exception_guidelines.rb

#BAD: Rescuing a very generic error class like StandardError or ArgumentError without a logger statement. makes it harder to debug code #If someone modifies Foo#baz later, they'll be wondering why their errors aren't being caught.
begin
  Foo.calculate_baz
rescue StandardError => e
  return 5
end

#BAD: Never rescue Exception, use StandardError instead. Exception catches some signals as Exceptions.
begin
 ...
rescue Exception => e
 ...
end

#GOOD: Rescuing StandardError is fine, so long as its logged
begin
 ...
rescue StandardError => e
  logger.warn("Could not frozzle foo: #{e.message}\n{e.backtrace.join("\n")}")
end

#GOOD: Silence only specific error classes
begin
 ...
rescue Foo::TheMonkeysGotOut #False alarm
end