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-rw-r--r--guides/source/i18n.md20
1 files changed, 20 insertions, 0 deletions
diff --git a/guides/source/i18n.md b/guides/source/i18n.md
index 7465726dca..c61b6ad214 100644
--- a/guides/source/i18n.md
+++ b/guides/source/i18n.md
@@ -664,6 +664,26 @@ I18n.t 'activerecord.errors.messages'
# => {:inclusion=>"is not included in the list", :exclusion=> ... }
```
+If you want to perform interpolation on a bulk hash of translations, you need to pass `deep_interpolation: true` as a parameter. When you have the following dictionary:
+
+```yaml
+en:
+ welcome:
+ title: "Welcome!"
+ content: "Welcome to the %{app_name}"
+```
+
+then the nested interpolation will be ignored without the setting:
+
+```ruby
+I18n.t 'welcome', app_name: 'book store'
+# => {:title=>"Welcome!", :content=>"Welcome to the %{app_name}"}
+
+I18n.t 'welcome', deep_interpolation: true, app_name: 'book store'
+# => {:title=>"Welcome!", :content=>"Welcome to the book store"}
+```
+
+
#### "Lazy" Lookup
Rails implements a convenient way to look up the locale inside _views_. When you have the following dictionary: