Can't figure out how YAML maps work

[skorokithakis]

I have this CUE schema:

#Apps: {
	[string]: #App

	#App: {
		enabled?:          bool
		url:               string
		branch?:           string
		environment_file?: string
		environment?: {string: string}
		replacements?: {string: string}
		compose_config?: [...string] | string
	}
}

apps: #Apps

config: {prune: bool}

I'm trying to validate this YAML file:

apps:
  bar:
    url: https://example.com/stavros/foo.git
    environment:
      FOO: bar

However, I get an error:

apps.bar.environment: field not allowed: FOO:
    ./harbormaster.cue:2:12
    ./harbormaster.cue:9:17
    ./harbormaster.cue:15:7
    ./harbormaster.yml:5:8

I don't know why, since I have the map defined. What am I doing wrong?

[verdverm]

You have a map of apps defined, however the following

environment?: {string: string}
replacements?: {string: string}

should be

environment: [string]: string
replacements: [string]: string

[skorokithakis]

Oh hmm, thank you. Isn't that a list though? The YAML example mentions it, but it doesn't really say what that construct means.

[skorokithakis]

That did work, thanks!

[verdverm]

foo: [string]: _ is a pattern constraint (formally template)

foo: [...string] is a list of strings, [..._] a list of anything, note the ellipses

[skorokithakis]

I see, thank you!