Hapijs Joi reference schema keys to reuse in other models or in routes - validation

Question

I have an example model constructed like so:
const MyModelResponse = Joi.object().keys({
id: Joi.number().integer().required()
.description('ID of the example model'),
description: Joi.string()
.description('Description of the example model'),
})
.description('example instance of MyModel with the unique ID present')
.label('MyModelResponse');
In my route, I want to make sure that my input parameter is validated against the id property of MyModeResponse like so:
validate: {
params: {
id: MyModelResponse.id,
},
options: { presence: 'required' },
failAction: failAction('request'),
}
This results in the schema validation error upon server start:
AssertionError [ERR_ASSERTION]: Invalid schema content: (id)
Is there a way to reference a key of a schema? Currently, I have to resort to either of the following:
Not referencing my MyModelResponse schema at all:
validate: {
params: {
id: Joi.number().integer().description('id of MyModel instance to get'),
},
options: { presence: 'required' },
failAction: failAction('request'),
}
Not using the Joi.object.keys() constructor by defining my model like this:
const MyModelResponse = {
id: Joi.number().integer().required()
.description('ID of the example model'),
description: Joi.string()
.description('Description of the example model'),
}
The bottom approach allows me to reference the id property in my route but doesn't allow me to add descriptions and labels to my schema. I have tried using MyModel.describe().children.id in my route validation and I have made some attempts to deserialize the id object into a schema object to no avail.
Any suggestions would be appreciated.

Answer 1

Remove the keys() and use as follows
const MyModelResponse = Joi.object({
id: Joi.number().integer().required()
.description('ID of the example model'),
description: Joi.string()
.description('Description of the example model'),
})
.description('example instance of MyModel with the unique ID present')
.label('MyModelResponse');