Fix human_attribute_name to handle names with dots

Nested I18n namespace lookup under activerecord.models is deprecated now (c19bd4f).
But when a model uses accepts_nested_attributes_for, its Errors object can have
an attribute name with "addresses.street" style. In this case, the dots should be
substituted with slashes so that we can provide the translation under the
"activemodel.attributes.person.addresses/street" key.

1 files changed, 6 insertions, 2 deletions

diff --git a/activemodel/lib/active_model/translation.rb b/activemodel/lib/active_model/translation.rb
index 6d64c81b5f..d776fe0ce6 100644
--- a/activemodel/lib/active_model/translation.rb
+++ b/activemodel/lib/active_model/translation.rb
@@ -43,8 +43,12 @@ module ActiveModel
     #
     # Specify +options+ with additional translating options.
     def human_attribute_name(attribute, options = {})
-      defaults = lookup_ancestors.map do |klass|
-        :"#{self.i18n_scope}.attributes.#{klass.model_name.i18n_key}.#{attribute}"
+      defaults = []
+      lookup_ancestors.each do |klass|
+        if attribute.match(/\./)
+          defaults << :"#{self.i18n_scope}.attributes.#{klass.model_name.i18n_key}.#{attribute.gsub(/\./, '/')}"
+        end
+        defaults << :"#{self.i18n_scope}.attributes.#{klass.model_name.i18n_key}.#{attribute}"
       end
 
       defaults << :"attributes.#{attribute}"