yq append 数据到 yaml 文件就地

Question

I have a YAML file file.yaml of this sort:

category: fruits
some_dummy_key: value

Now i would like to use Mike farah's yq v4(version 4.5.1 to be specific) https://github.com/mikefarah/yq to append details key inplace which has a list of name, color that should look like this:

category: fruits
somme_dummy_key: value
details:
- name: banana
  color: yellow
- name : apple
  color: red  

In yq version, i know we could do a

./bin/yq write -i file.yaml details.[0].name banana

./bin/yq write -i file.yaml details.[0].color yellow

and so on. But how do i do it using yq v4's eval command. I really appreciate any help with this.

Answer 1

Here is how it can be done. You will have to create a new root value called details and assign the parameters.

cbiswal@XXXXX:~$ cat tet.yaml
category: fruits
somme_dummy_key: value
cbiswal@XXXXX:~$ yq e '."details"+=[{"name":"mango","color":"yellow"},{"name":"apple","color":"red"}]' tet.yaml
category: fruits
somme_dummy_key: value
details:
  - name: mango
    color: yellow
  - name: apple
    color: red

Note that:

$ yq --version
yq version 4.7.0