How to loop list in a Yaml data source

[ffsetit]

I have a need to generate multiple output files based on a single template. The key is a list defined in a yaml datasource

root:  
  region:
    primary: us-east1
      abbr: use1
    secondary: us-central1
      abbr: usc1

I have the file put working using the temp.Exec and file.Write functions (using a simple math.Seq), however i am currently unable to loop based on the regions from the datasource.
I've tried multiple versions including

{{ $regions := (ds "config").root.region }}
{{- range $region := $regions -}}

No matter what i try i get a template rendering error mapping values are not allowed in this context

[hairyhenderson]

Hi @ffsetit, that error is a YAML parsing error. YAML like this is invalid:

primary: us-east1
  abbr: use1

The problem is that it's interpreting us-east1 as a scalar (string) value for the key primary, but it seems you're also trying to assign an object value (abbr: use1).

You'll need to fix the YAML first. I would suggest something like:

primary:
  name: us-east1
  abbr: use1

[ffsetit]

This was the issue.

On a connected question. Is there a way to prevent the output of the template file itself when using tmpl.Exec? I have a mix of standard template files that need to be copied to the output-dir with their current path intact, and some that need multiple output files from a single template, where the looping needs to be part of the output path.

e.g.

templates/folderA/files/multifile-template.yml
templates/folderA/templateA.yaml
templates/folderA/templateB.yaml
templates/folderA/templateC.yaml

gomplate --input-dir ./template -d config=<path_to_config> --output-dir /projects/RepoA/

The expected result being

/projects/RepoA/folderA/files/<loop_variable_iteration#1>/multifile-template.yml
/projects/RepoA/folderA/files/<loop_variable_iteration#n>/multifile-template.yml
/projects/RepoA/folderA/templateA.yaml
/projects/RepoA/folderA/templateB.yaml
/projects/RepoA/folderA/templateB.yaml

When i run this i have two issues

• I have to specify the exact path to output in the multifile template or it complains that the output path doesn't exist in the template
• I also get an empty file output /projects/RepoA/folderA/files/multifile-template.yml

[ffsetit]

Is it possible somehow to reference the path specified in the output-dir arg?

[hairyhenderson]

Hi @ffsetit - sorry I missed this - it probably should be a new discussion topic!

For the second thing (empty output), see https://docs.gomplate.ca/usage/#suppressing-empty-output - that might help.

For the first, perhaps https://docs.gomplate.ca/functions/tmpl/#tmplpathdir will help?

If you still need help on this, please open a new discussion topic.