Validate a request body so that it does contain a non-empty array

[savissimo]

Say I have a schema like this:

const eventTimeSlotSchema = { /* ... */ }
const eventSchema = {
    additionalProperties: false,
    properties: {
        name: { type: 'string' },
        timeSlots: { 
            type: 'array',
            items: eventTimeSlotSchema,
        },
    },
    required: [ 'name', 'timeSlots' ],
    type: 'object',
}

I want to return a Bad Request when the timeSlots array of time slots is empty. In other words, the request must contain at least a time slot.

Can I do this in the schema definition?

Do I have to do it in the action's code? If that's the case, how do I return a Bad Request response?

[LoicPoullain]

{
  type: 'array',
  items: eventTimesSlotSchema,
  minItems: 1,
}

Could this work?

[savissimo]

That's exactly it, thank you a lot!

I'm new to the whole FoalTS / OpenAPI schemas thing, and I'm having a hard time finding documentation about it. Where can I find some good docs? Or, what keywords should I be looking for? Are FoalTS's schemas exactly OpenAPI schemas?

[LoicPoullain]

FoalTS validation hooks are based on AJV validator which uses JSON schemas. AJV's website has pretty good docs: https://ajv.js.org/json-schema.html.

Are FoalTS's schemas exactly OpenAPI schemas

OpenAPI and JSON schemas are very similar and will be the same in most cases, although there might be some differences in some special cases: https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.0.1.md#schema-object

[savissimo]

Thanks a lot, that's what I needed.