On Aug 5, 2014 6:41 PM, "Reid Vandewiele" <[email protected]> wrote:
> Example 1 (assuming behavior whereinmerging is OK, and that explicit
parameter specification takes precedence):
>
> apache::vhost { $servername:
> port => $port,
> ssl => $ssl,
> attribute_defaults => $extra_opts,
> }
Assuming that the semantics of 'undef' haven't changed to preclude this (I
know there are changes coming but don't quite remember what they are), an
interesting couple of cases are:
$extra_opts = { $ssl => true, ... }
apache::vhost { ...
ssl => undef,
attributes => $extra_opts,
}
And:
$extra_opts = { $ssl => undef, ... }
apache::vhost { ...
ssl => true,
attributes => $extra_opts,
}
My expectation is that in both cases 'undef' means "pretend I've said
nothing about thus attribute here" and that *true* wins in either case.
But what if what is intended is to explicitly *ignore* the setting in
$extra_opts, so that the type's default is used, as if the attribute had
been mentioned by neither the $extra_opts hash or the apache::vhost
declaration? I guess using a hash operation to copy and filter $extra_opts
would do it.
By the way (since the paint's not dry) I think just *attributes* as the
afforementioned metaparam would be best -- it clearly says what it is, is
short, and is meta-sounding enough that I would not even consider using it
"in the field" -- when developing a class, defined type, type/provider, etc.
Another alternative that occurs to me that breaks the "key => val" layout
and so is cognitively distinct is to use something like the facilities that
many modern languages have for passing hashes or arrays as arguments to
methods/functions:
apache::vhost { $title:
...
**$extra_opts
}
or:
apache::vhost { $title:
...
&$extra_opts
}
or:
apache::vhost { $tilte:
...
*$extra_opts
}
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