Is there a way to used dot-nested vars with 'default' filter in jinja2 templates?

[Kesten Broughton]

I have the need to template a yaml file using vars in another yaml file as input.  There are often defaults.

I'd like to do this

in vars.yml

parentvar:

  childvar:

    subvar1: val1

#  subvar2 is not even listed to keep user vars.yml file concise

template.yml

{{ parentvar.childvar.subvar1 }}

{{ parentvar.childvar.subvar2 | default("default for subvar2") }}

This fails with "dict object has no attribute 'subvar2'

It would work fine if i had

vars.yml

parentvar_childvar_subvar1: val1

 

and template.yml

{{ parentvar_childvar_subvar1 }}

{{ parentvar_childvar_subvar2 | default("default for subvar2") }}

I presume this is a problem at the jinja2 level? 

I would like to avoid the '_' flattened solution as it becomes pretty unreadable for large config files.

Any suggestions on how to work around this?

thanks

Kesten Broughton
512 701 4209

[C. Morgan Hamill]

Not positive if this will work, but try:

Excerpts from Kesten Broughton's message of 2014-04-24 10:06:13 -0400:
> template.yml
> {{ parentvar.childvar.subvar1 }}
> {{ parentvar.childvar.get('subvar2', 'default for subvar2') }}
--
Morgan Hamill

[Matt Martz]

It works best to use standard hash key access such as:

foo['bar']['baz']|default('qux')

Jinja2 seems to be able to handle it better.

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