[chef] Re: Re: node.attribute? check nested

[Nathaniel Eliot < >]

Good practice here to make sure you're setting default['foo'] = {} in
your attributes file. Otherwise, a "tried to treat a nil like a hash"
error will break your script, if node['foo'] isn't set.

If you can't be sure that node['foo'] will be set (for some reason),
you can append a 'rescue false' to your test, to prevent that:

if ( (!node['foo']['bar'].nil?) rescue false)
  # do something only if node['foo']['bar'] is set
end

(Note that the rescue modifier will eat *all* errors within the clause
it modifies. Don't use it for more complicated statements.)

Cheers,

--
Nathaniel Eliot
T9 Productions


On Sun, Jul 14, 2013 at 11:24 AM, Nic Grayson 
<
 >
 wrote:
> node['foo']['bar'] is just a variable so any ruby logic will work
>
> puts "it's not set" unless node['foo']['bar']
>
> if node['foo']['bar'] == "biz" etc.
>
>
> On Sun, Jul 14, 2013 at 11:02 AM, Daniil S 
> <
 >
>  wrote:
>>
>> Hello.
>> Official documentation mentions such construction:
>> not_if { node.attribute?("some_command_complete") }
>>
>> Can I check nested attribute with it?
>> For example, if i have attribute node['foo']['bar'], how can i check if it
>> is set?
>
>