How to assign (update) a value as a list (array) or a dict

[juanpons]

I am using yq to update helm chart yaml files.
Sometimes I require that the value assigned is a list or a dict.
For instance, I may want to change from:

ingress:
  hosts: [ ]

to:

ingress:
  hosts:
    - host: chart.domain.com
      paths: [ ] 

I could do that easily in version 3, however I have not yet found how to do it in version 4.

Ideally this may work:

yq -i   ' .ingress.hosts = "[ { host: chart.domain.com, paths: [ ] }  ]"    ingress.yaml

However this sets the ingress hosts variable to a text string, instead of setting it to a list of dicts.

If I remove the outer " " , I get error that the [ is unexpected.

Any ideas?

Help kindly appreciated!

[mikefarah]

What you need to do is append to the array. Putting everything in double quotes will set it as a string.

I'm not at a machine with yq installed, but it should look something like:

yq -i   ' .ingress.hosts += {"host": chart.domain.com, "paths": []}'

Note that quotes are required around the string key name (as you can use an expression for the key, just as you do for the value).

[juanpons]

Thanks Mike!
It worked with a minor change (add commas to chart.domain,com)

yq -i   ' .ingress.hosts += {"host": "chart.domain.com", "paths": []}'

KR, Juan