diff --git a/remarkable/lib/remarkable/messages.rb b/remarkable/lib/remarkable/messages.rb
index 57fbe97..814ea19 100644
--- a/remarkable/lib/remarkable/messages.rb
+++ b/remarkable/lib/remarkable/messages.rb
@@ -85,7 +85,7 @@ def array_to_sentence(array, inspect=false, empty_default='')
         two_words_connector = Remarkable.t 'remarkable.core.helpers.two_words_connector'
         last_word_connector = Remarkable.t 'remarkable.core.helpers.last_word_connector'
 
-        array.map!{|i| i.inspect} if inspect
+        array = array.map { |i| i.inspect } if inspect
 
         case array.length
           when 0
diff --git a/remarkable_activerecord/lib/remarkable_activerecord/base.rb b/remarkable_activerecord/lib/remarkable_activerecord/base.rb
index 73e16bf..a2dab40 100644
--- a/remarkable_activerecord/lib/remarkable_activerecord/base.rb
+++ b/remarkable_activerecord/lib/remarkable_activerecord/base.rb
@@ -1,6 +1,7 @@
 module Remarkable
   module ActiveRecord
     class Base < Remarkable::Base
+      I18N_COLLECTION = [ :attributes, :associations ]
 
       # Provides a way to send options to all ActiveRecord matchers.
       #
@@ -206,12 +207,14 @@ def collection_interpolation #:nodoc:
             @spec.send(:described_class)
           end
 
-          if RAILS_I18N && described_class.respond_to?(:human_attribute_name) && self.class.matcher_arguments[:collection]
+          if i18n_collection? && described_class.respond_to?(:human_attribute_name)
             options = {}
 
             collection_name = self.class.matcher_arguments[:collection].to_sym
             if collection = instance_variable_get("@#{collection_name}")
-              collection.map!{|attr| described_class.human_attribute_name(attr.to_s, :locale => Remarkable.locale).downcase }
+              collection = collection.map do |attr|
+                described_class.human_attribute_name(attr.to_s, :locale => Remarkable.locale).downcase
+              end
               options[collection_name] = array_to_sentence(collection)
             end
 
@@ -227,6 +230,12 @@ def collection_interpolation #:nodoc:
           end
         end
 
+        # Returns true if the given collection should be translated.
+        #
+        def i18n_collection? #:nodoc:
+          RAILS_I18N && I18N_COLLECTION.include?(self.class.matcher_arguments[:collection])
+        end
+
     end
   end
 end