# Rails 2.3 problem

**URL:** <https://www.ruby-forum.com/t/rails-2-3-problem/159336>\
**Category:** Rails\
**Created:** [February 3, 2009, 4:38pm UTC](https://www.ruby-forum.com/t/rails-2-3-problem/159336 "2009-02-03T16:38:55Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![joopp](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/3da27b/32.png) [@joopp](https://www.ruby-forum.com/u/joopp)\
**Post date:** [February 3, 2009, 4:38pm UTC](https://www.ruby-forum.com/t/rails-2-3-problem/159336/1 "2009-02-03T16:38:55Z")

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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  
it!  
You might have expected an instance of Array.  
The error occurred while evaluating nil.\<\<) on line #158 of  
app/views/places/show.html.erb:  
158:

  
159: 
### \<%= “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:in`form\_for’  
app/views/places/show.html.erb:158

Any help is greatly appreciated!

---

<div class="post-metadata">

**Author:** ![joopp](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/3da27b/32.png) [@joopp](https://www.ruby-forum.com/u/joopp)\
**Post date:** [February 6, 2009, 9:23am UTC](https://www.ruby-forum.com/t/rails-2-3-problem/159336/2 "2009-02-06T09:23:36Z")

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

---

<div class="post-metadata">

**Author:** ![joopp](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/3da27b/32.png) [@joopp](https://www.ruby-forum.com/u/joopp)\
**Post date:** [February 3, 2009, 5:43pm UTC](https://www.ruby-forum.com/t/rails-2-3-problem/159336/3 "2009-02-03T17:43:05Z")

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