Rails 2.3 problem


When moving to Rails 2.3.0RC1 I get an error with concat!? I can’t
figure it out. See the dump below:

ActionView::TemplateError (You have a nil object when you didn’t expect
You might have expected an instance of Array.
The error occurred while evaluating nil.<<) on line #158 of


<%= “What do you think about ‘%s’?” / @place %>

160: <% end -%>
161: <% form_for([@place, @review = Review.new]) do |f| %>
actionpack (2.3.0) lib/action_view/helpers/text_helper.rb:32:in

concat' actionpack (2.3.0) lib/action_view/helpers/form_helper.rb:252:inform_for’

Any help is greatly appreciated!


The problem was Erubis.
This (faster erb renderer) doesn’t work with Rails 2.2.2 and 2.3 yet.


It seems to be something with form_for and blocks or something?! It does
NOT appear in Rails 2.2.2 however :S