# Wiki create page fails with useless error

**URL:** <https://www.ruby-forum.com/t/wiki-create-page-fails-with-useless-error/131167>\
**Category:** Rails\
**Created:** [March 6, 2008, 5:01pm UTC](https://www.ruby-forum.com/t/wiki-create-page-fails-with-useless-error/131167 "2008-03-06T17:01:11Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![dale](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/ecd19e/32.png) [@dale](https://www.ruby-forum.com/u/dale)\
**Post date:** [March 6, 2008, 5:01pm UTC](https://www.ruby-forum.com/t/wiki-create-page-fails-with-useless-error/131167/1 "2008-03-06T17:01:11Z")

</div>

Beats me where to send this…but somebody should fix it. I gave up  
and removed the dead link & added a pointer to the semi-useful RSS  
feed…that at least created correctly.

I was trying to update a wiki page, and the create simply said that  
the create validation failed with value ‘false’  
Here’s the wiki page…  
[http://wiki.rubyonrails.org/rails/pages/HowtoWorkWithHelpers](http://wiki.rubyonrails.org/rails/pages/HowtoWorkWithHelpers)

And the edit which I inserted inbetween the ‘see also’ and the  
‘category’:  
From the now dead link (apologies to Bruce for the raw copy):  
[http://codefluency.com/2006/5/28/rails-views-helpers-that-take-blocks](http://codefluency.com/2006/5/28/rails-views-helpers-that-take-blocks)  
(found at [http://www.planetrubyonrails.org/show/feed/164](http://www.planetrubyonrails.org/show/feed/164))

Rails Views: Block Helper Example

Posted by Bruce 644 days ago

A few articles back, I mentioned how useful helpers that take blocks  
can be within your views.

I thought I’d give a little example, giving a helper I find pretty  
useful in my own projects.

Here’s the code, which I’ll explain in a moment:

```

def link_to_section(name, html_opts={}, &block)
  section_id = name.underscore.gsub(/\s+/,'_')
  link_id = section_id + '_link'
  # Link
  concat(link_to_function(name,update_page{|page|
    page[section_id].show
    page[link_id].hide
  }, html_opts.update(:id=>link_id)), block.binding)
  # Hidden section
  concat(tag('div',
{:id=>section_id, :style=>'display:none;'},true),block.binding)
  yield update_page{|page|
    page[section_id].hide
    page[link_id].show
  }
  concat('', block.binding) end

```

What this makes possible is stuff like:

```

<% link_to_section("View Details") do |closer| %>

```

Details

Some detailed text detailing detailed details.

```

<%= link_to_function("Hide Details",closer) %>
<% end %>

```

What’s going on here is actually pretty simple. The helper generates a  
link (with the label you’ve given) to show a a hidden div and hide  
itself. The block given to the helper is what will end up inside that  
div, and it’s yielded the snippet of javascript necessary to switch  
back (so that you can use that snippet wherever you’d like).

Keep in mind assumes you’ll only have one link per page with the same  
label … if you think that won’t be the case, you’ll probably want  
ensure the ids generated inside the helper are unique; using object\_id  
would be a simple way to do so.