yq filter with select from different map/list

Question

example_a:
  - key: sa01
    name: sa

match_a:
  sa_key: sa01

This one works:

yq '.example_a[] |select(.key == "sa01")' 

Is it possible to make it work this way:

yq '.example_a[] |select(.key == .match_a.sa_key)'

Answer 1

Yes, that's possible using a variable on the key:

yq '.match_a.sa_key as $key | .example_a[] |select(.key == $key)' i.yaml

So we save .match_a.sa_key as the var $key, so that we can use that in the select() directly

---

Output:

key: sa01
name: sa