Use variable to access config in Grails Holders

Question

Using Grails 2.3.7, I set a property in my config file:

foo.bar = ['whatever']

I can access using Holders...

Holders.config.foo.bar

For convenience I put Holders in util method:

static getCfgProp(key){
  Holders.config.get(key)
}

But getCfgProp('foo.bar') doesn't work (guessing because foo.bar is nested map key).

It works if I flatten the config:

static getCfgProp(key){
  Holders.getFlatConfig().get(key)
}

..but don't want to do that each time method is invoked.

Tried these, none worked, I must be missing something simple

Holders.config."${key}"
Holders.config."$key"
Holders.config.getProperty(key)
Holders.config.(key)

@tim_yates, what's your take: go with `Eval` or flatten config, in terms of performance? — raffian, May 25 '14 at 22:23

nickdos · Answer 1 · 2014-05-26T01:45:04.640

1

This is what I've used for displaying a config var value (via a form input):

grailsApplication.config.flatten()."${it}"

where ${it} is the input string. This works for both non-nested and nested keys due to the flatten() method.

EDIT: just realised this is the equivilent of your Holders.getFlatConfig() so probably not useful. Not sure why you

don't want to do that each time method is invoked

Performance? Have you benchmarked it?

edited May 26 '14 at 01:45

answered May 26 '14 at 01:39

nickdos

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I have not bench-marked it, but tim said to not use Eval, so little choice left! :-) – raffian May 26 '14 at 01:46

score 0 · Answer 2 · answered Mar 05 '21 at 09:27

This has worked for me with grails-2.5.6:

Holders.config[key].subkey.subsubkey...
Holders.config[key][subkey].subsubkey...

// for Holders.config.foo.bar.zet
Holders.config['foo'].bar.zet
Holders.config['foo']['bar'].zet
Holders.config['foo']['bar']['zet']

Use variable to access config in Grails Holders

2 Answers2