[chef] Re: Templates don't fail when values are missing

[AJ Christensen < >]

In ruby, Hash[nil] => nil; so, explicitly bind your hash keys to
'variables' in the template and then check for presence of the ivar.

An alternate workaround: <%= if @property.key?('foobar') %>

Cheers,

AJ


On 16 April 2013 06:48, Peter Loron 
<
 >
 wrote:
> I have a large (hundreds of properties, dozens of templates) set of 
> templates I'm porting from Nant to Chef. The properties in the old system 
> are scattered across multiple files and while aggregating the properties 
> into data bags and adjusting the templates, I have missed some values.
>
> The call in the recipe to merge each template with the properties from the 
> data bags works, but values that are not present in the hash are simply 
> empty in the generated template. The substitution fails silently.
>
> For example, if I have this in the template:
>
> <foobar value="<%= @property['foobar'] %>" />
>
> … and the 'foobar' key/value pair is not present, I wind up with this in 
> the generated file:
>
> <foobar value="" />
>
>
>
> Is there any way to get Chef to throw a warning or error in this case?
>
> Thanks.
>
> -Pete