nullable does not allow null as a value

[chasain]

Using a paramater like:

config:
  site:
    ## @param config.site.version [string,nullable] Version of config archive
    ##
    version: null

gives a schema definition of:

  "version": {
      "type": "string",
      "description": "Only valid with source: Nexus. Version of config archive",
      "default": "null",
      "nullable": true
  },

which doesn't allow for actual null values.

config.site.version: Invalid type. Expected: string, given: null

if I manually change the schema to:

  "version": {
      "type": ["string", "null"],
      "description": "Only valid with source: Nexus. Version of config archive",
      "default": "null",
      "nullable": true
  },

then it seems to work correctly

[chasain]

workaround I'm using for anyone experiencing similar:

cat <<< $(jq '(..|objects|select(.nullable)).type |= ["string","null"]' values.schema.json) > values.schema.json

[miguelaeh]

Hi @chasain , thanks for reporting it. It looks like you are right, it should be null not "null"

[miguelaeh]

@chasain can you take a look at the referenced PR? It fixes the reported issue

[chasain]

doesn't look like it, I now have the schema of

                        "config": {
                            "type": "string",
                            "description": "Only valid with source: Nexus. Name of config archive",
                            "default": null,
                            "nullable": true
                        },

but I still get

- config.site.config: Invalid type. Expected: string, given: null

I was only able to get rid of it by changing type to

"type": ["string", "null"],

[miguelaeh]

Could you provide more information on where do you get the error:

- config.site.config: Invalid type. Expected: string, given: null

?

[chasain]

Just tested the latest version to see if this fixed my issue but it unfortunately has not. I'm running the command readme-generator -r README.md -v values.yaml -s values.schema.json then testing the schema with a helm template . command and that fails with the given error until I change the type to ["string", "null"]

My helm version is version.BuildInfo{Version:"v3.7.0", GitCommit:"eeac83883cb4014fe60267ec6373570374ce770b", GitTreeState:"clean", GoVersion:"go1.16.8"}

[miguelaeh]

@chasain I am able to get this error:

Error: values don't meet the specifications of the schema(s) in the following chart(s):
rabbitmq:
has a primitive type that is NOT VALID -- given: // Expected valid values are:[array boolean integer number null object string]

But it does not show the parameter that is failing, how did you figure out that?

[chasain]

Hmm, odd that's a pretty different error than I get, mine just looks like this:

helm template .
Error: values don't meet the specifications of the schema(s) in the following chart(s):
chart-name:
- config.model.hostname: Invalid type. Expected: string, given: null
- config.model.bucketURL: Invalid type. Expected: string, given: null
- config.model.prefix: Invalid type. Expected: string, given: null
- config.model.config: Invalid type. Expected: string, given: null
- config.model.version: Invalid type. Expected: string, given: null
- config.model.fileOrDirectory: Invalid type. Expected: string, given: null

for a values file like

config:
  model:
    ## @param config.model.source Location to pull configs from, valid values are Disk/Nexus/Bucket
    ##
    source: Disk
    ## @param config.model.config [string,nullable] Only valid with source: Nexus. Name of config archive
    ##
    config: null
    ## @param config.model.version [string,nullable] Only valid with source: Nexus. Version of config archive
    ##
    version: null
    ## @param config.model.prefix [string,nullable] Only valid with source: Nexus/Bucket. A path to strip from the config directory
    ##
    prefix: null
    ## @param config.model.mountPath Path to mount the config directory inside the containers
    ##
    mountPath: /app/model
    ## @param config.model.hostname [string,nullable] Only valid with source: Nexus/Bucket. The hostname in the configs archive, stripped from the config directory
    ##
    hostname: null
    ## @param config.model.bucketURL [string,nullable] Only valid with source: Bucket. The gsutil URL of the bucket to pull
    ##
    bucketURL: null
    ## @param config.model.fileOrDirectory [string,nullable] Only valid with source: Bucket, default Directory, valid values Directory/File.
    ## Determines whether gsutil uses cp or rsync, type File will not sync changes to the source file and should be avoided.
    ##
    fileOrDirectory: null
    ## @param config.model.hostPath [string,nullable] Only valid with source: Disk. The location on disk to mount from, can include .repository.path
    ##

[miguelaeh]

mmm looks like the schema generated is correct. I just found that there is a difference between OpenAPI version 3.0 and 3.1 here. Does it work if you specify it on the 3.1 format?

[chasain]

Ok, look like helm is using this library which is pinned to Draft 07 of jsonschema.org and doesn't support OpenAPI's version of the schema. If I manually edit the schema to the 3.1 format as specified in that stackoverflow article it does work, ie.

    "config": {
      "type": "object",
      "properties": {
        "site": {
          "type": "object",
          "properties": {
            "source": {
              "type": "string",
              "description": "Location to pull configs from, valid values are Disk/Nexus/Bucket",
              "default": "Disk"
            },
            "config": {
              "type": [
                "string",
                "null"
              ],
              "description": "Only valid with source: Nexus. Name of config archive",
              "default": null,
              "nullable": true
            },
            "version": {
              "type": [
                "string",
                "null"
              ],
              "description": "Only valid with source: Nexus. Version of config archive",
              "default": null,
              "nullable": true
            },
...

[chasain]

you can test the fix yourself with the workaround I commented earlier

cat <<< $(jq '(..|objects|select(.nullable)).type |= ["string","null"]' values.schema.json) > values.schema.json

[miguelaeh]

Thank you very much for the confirmation. I will create a task to fix this.