[chef] Re: Re: Re: Re: Array attributes merge

[Noah Kantrowitz < >]

https://coderanger.net/2013/06/arrays-and-chef/ goes over this in great ;
detail :)

--Noah

On Oct 21, 2013, at 11:27 PM, "aL." 
<
 >
 wrote:

> Even += works in order to append values he he.
> 
> May be that recipes attr definitions just override attr files ones.
> 
> Mike: I have checked out that arrays merge works well on defaults attr 
> files + defaults on role. So environment and roles examples on the link, 
> are just examples, i think.
> 
> Can a opscode dev, explain what is the exactly behaviour with arrays on 
> attributes? Looks like it depends where you define the attr override works 
> as expected o_O
> 
> El 21/10/2013 16:22, "Luke Bradbury" 
> <
 >
>  escribió:
> My experience with this issue was similar, however I found that << doesn't 
> play nice with the autovivification.
> Consequently I've been using this pattern as a workaround:
> 
> 
> 
> 
> node.default['foo'] = node['foo'].to_a.push('bar')
> 
> Regards,
> Luke
> 
> 
> On 21 October 2013 16:04, Michael Glenney 
> <
 >
>  wrote:
> I don't have a complete answer but I know that:
> 
> 1)  The doc you linked to specifically calls out roles and environments. 
> Might be a clue
> 2)  When writing a provider for a cookbook attributes are mutable. So maybe 
> this will work for you within a recipe: 
> 
> node.default['foo'] << 'bar'
> 
> Sent from my iPhone
> 
> On Oct 21, 2013, at 5:22 AM, "aL." 
> <
 >
>  wrote:
> 
>> Hi guys!
>> 
>> According to this: 
>> http://docs.opscode.com/essentials_node_object_deep_merge.html#addition
>> 
>> Array attributes are merged, i have checked out that this is the behaviour 
>> when using default attributes on attribute files and roles. 
>> 
>> But when i try to define a default attribute on one recipe: 
>> 
>> node.default['foo'] = ['bar'] 
>> 
>> The one that i have already on defaults.rb attribute file: 
>> 
>> node.default['foo'] = ['littlebar'] 
>> 
>> Is overrided by the one i defined on the recipe, resulting node['foo'] = 
>> ['bar']
>> 
>> Defining on  a role:
>> 
>> default_attributes (:foo => ['bar']) 
>> 
>> Works as expected, and results on node['foo']  = ['littlebar','bar']
>> 
>> So what exactly node.default['x'] = value do on recipes? Looks like a 
>> direct override... O_o
>> 
>> --
>> Si necesitas una máquina para hacer algo y no la compras al final te darás 
>> cuenta de que has pagado lo mismo y no tienes la máquina.--Henry Ford
>> Alberto
>

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