add spec about removing empty locale hash after last attribute is del…

…eted

lib/mobility/backends/active_record/container.rb

@@ -81,7 +81,7 @@ def get_column_type
 
       # @!macro backend_iterator
       def each_locale
-        model[column_name].each do |l, v|
+        model[column_name].each_key do |l|
           yield l.to_sym
         end
       end

spec/databases.yml

@@ -13,7 +13,7 @@ postgres:
   host: localhost
   port: 5432
   database: mobility_test
-  username: markus
+  username: postgres
   encoding: utf8
 
 sqlite3:

spec/mobility/backends/active_record/container_spec.rb

@@ -38,6 +38,18 @@
           .and not_change { post.changed? }.from(false)
       end
     end
+
+    it 'deletes locale hash if last attribute is removed' do
+      post = ContainerPost.create!
+
+      ::Mobility.with_locale(:en) { post.title = 'Title en' }
+      ::Mobility.with_locale(:de) { post.title = 'Title de' }
+
+      expect { post.title = nil }
+        .to change { post.translations }
+        .from({ "en" => { "title" => "Title en" }, "de" => { "title" => "Title de" }})
+        .to({ "de" => { "title" => "Title de" }})
+    end
   end
 
   context "with query plugin" do