Generate does not output placeholders for boolean properties

[willosborne]

Bug Report

Steps to Reproduce:

Add a boolean field to a node, relationship or metadata object

e.g.

{
    "type": "object",
    "properties": {
          "propertyBoolean": {
                  "type": "boolean"
           }
      }
}

Expected Result:

{
     "propertyBoolean": "{{ PROPERTY_BOOLEAN }}"
}

Actual Result:

{}

Environment:

Latest version of CLI

Additional Context:

Placeholder values are tricky here. We can't just output false as this could be dangerous. We should consider a warning to use enums instead of booleans. Suggested fix for booleans is:

• output a string placeholder (will fail validation)
• emit a warning saying to use enums instead
• add a spectral rule to also emit this warning on pattern files

[rocketstack-matt]

I was reviewing the newly launched tour.json-schema.org (which is very cool btw, going to link it from our docs).

So it turns out we have another option here by combining boolean and null type.

If we defined the type as

{
  "type": ["boolean", "null"]
}

then we could use a null placeholder, the schema would be valid but we could warn the null placeholder.