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Update i18n guide to cover :zero key support in pluralization [ci skip]

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Anne Johnson 2017-02-26 15:31:06 -05:00
parent 7888f4fae0
commit acb4b46076
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10
guides/source/i18n.md
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@ -707,6 +707,7 @@ The `:count` interpolation variable has a special role in that it both is interp
```ruby
I18n.backend.store_translations :en, inbox: {
zero: 'no messages', # optional
one: 'one message',
other: '%{count} messages'
}
@ -715,15 +716,20 @@ I18n.translate :inbox, count: 2
I18n.translate :inbox, count: 1
# => 'one message'
I18n.translate :inbox, count: 0
# => 'no messages'
```
The algorithm for pluralizations in `:en` is as simple as:
```ruby
entry[count == 1 ? 0 : 1]
lookup_key = :zero if count == 0 && entry.has_key?(:zero)
lookup_key ||= count == 1 ? :one : :other
entry[lookup_key]
```
I.e. the translation denoted as `:one` is regarded as singular, the other is used as plural (including the count being zero).
The translation denoted as `:one` is regarded as singular, and the `:other` is used as plural. If the count is zero, and a `:zero` entry is present, then it will be used instead of `:other`.
If the lookup for the key does not return a Hash suitable for pluralization, an `I18n::InvalidPluralizationData` exception is raised.