Idea I18n.t(:not_existing).presence == nil

Hi guys,

I had an idea, just wondering what your thoughts on it are.

Short introduction: ActiveSupport 3 introduces the #presence method,
which returns nil if #present? returns false, otherwise it returns
self.

Can we define a singleton method on the strings that are returned when
the translation is not found?

Like this:

foo = I18n.t(:foo)
=> “translation missing: en, foo”

foo.present?
=> false

foo.blank?
=> true

foo.presence
=> nil

So, although it is a string (of some sort), it reacts as if its an
empty string, since there is no translation.

I know this is kinda counter-intuative, but it allows you to write:

I18n.t(:foo).presence || I18n.t(:hello)
=> “World”

Implementation wise, we could define some extra methods on this string
object, or we could make a MissingTranslation class that inherits from
String.

So, what are your opinions on this? Does anyone know of a gem that
already does something like this?

Cheers,
Iain H.
@iain_nl / github.com/iain / http://iain.nl

Hi Iain,

By default I18n.translate returns “translation missing” string when
translation is missing, so the present? method always return true on
that.
This is default behaviour, which is fine.

You can do it another way - by defining exception handler returning
nil on missing translation,
if you really need it:

def your_exception_handler(exception, locale, key, options)
if MissingTranslationData === exception
# return exception.message
return nil
end
raise exception
end

I18n.exception_handler = :your_exception_handler

Also, for such cases

I18n.t(:foo).presence || I18n.t(:hello)
=> “World”

you can always use default option I18n.t(:foo, :defult =>
I18n.t(:hello))

Regards,
KK

2010/4/16 iain hecker [email protected]:

String.

So, what are your opinions on this? Does anyone know of a gem that
already does something like this?

Cheers,
Iain H.
@iain_nl / github.com/iain / http://iain.nl


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