Lookup same keys in multiple hiera files in puppet using lookup command

Question

I am trying to read a key present in multiple hiera files and merge the values. My hiera file contains:

hierarchy:
  - name: "Per-env secrets"
    paths:
      - "puppet/hiera/dict-1.yaml"
      - "puppet/hiera/dict-2.yaml"

and My puppet script contains:

lookup(dictionaries,Hash).each |String $keyDico, Hash $valueDico| {
  notify{"The value of dictionary is: ${keyDico}": }

The key 'dictionaries' is present in both dict-1.yaml and dict-2.yaml. However, It always reads and prints the Key from the first matched hiera file.
I tried changing 'Hash' in lookup function's argument to 'Unique' or 'Deep'. But it didn't work.

Getting error: Error: Evaluation Error: Resource type not found: Deep and Error: Evaluation Error: Resource type not found: Unique
Is there any way to achieve this?

Thanks in advance.

Answer 1

If you look at the docs for specifying merge behaviours ( ref ), you can see that you need to specify the optional third argument to lookup , and you are getting that error because "unique" is being interpreted as the data type.

Try either:

lookup(dictionaries, Hash, 'unique')

or

lookup(dictionaries, Hash, {'strategy' => 'unique'})

according to whichever you find more readable.