[Radiant] Avoid Stylesheet Children

[Witter Cheng]

Mohit Sindhwani wrote:
> In my 'Hello World' example that I uploaded as a tutorial, I
> created a stylesheet as a child of the main page and then used that for
> styling the main page as well as any of its children.
> 
> Now, I've run into this problem.  If I try to iterate through the
> children of the main page to create a list of links to the children, it
> obviously also creates a link to the stylesheet.

Override the r:children tags.  Using the tags' option hash, join the 
layouts table and add a condition "layouts.content_type != 'text/css'.

To only get children which are normal pages, the conditions should be 
something like "pages.class_name = 'page' and (layouts.content_type = '' 
or layouts.content_type is null)".
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