Pass a parameter to a custom rule

[3adel-bassiony]

How I can pass a request input or a variable to the rule?
let's say I have this schema and I created a custom rule:

const orderSchema = schema.create({
    user_id: schema.number([rules.exists({ table: 'users', column: 'id' })]),
    address_id: schema.number([rules.exists({ table: 'addresses', column: 'id' })]),
    products: schema.array([rules.minLength(1)]).members(
        schema.object().members({
            id: schema.number([rules.exists({ table: 'products', column: 'id' })]),
            quantity: schema.number([rules.hasValidProductQuantity(id)]),
        })
    ),
    notes: schema.string.optional(),
})

how I can pass the product id to the rule validation of the quantity?
I followed the validations docs and I created a custom rule and everything is working well except I can't pass the product id to the rule

[3adel-bassiony]

I posted this issue on Discord and I got this solution:

validator.rule(
    'hasValidProductQuantity',
    async (value, _, options) => {
        if (typeof value !== 'number') {
            return
        }

        const id = validator.helpers.getFieldValue('id', options.root, options.tip)

        const product = await Product.query().where('id', id).first()

        if (!product) {
            return
        }

        if (value > product!.quantity) {
            options.errorReporter.report(
                options.pointer,
                'hasValidProductQuantity',
                'hasValidProductQuantity validation failed',
                options.arrayExpressionPointer
            )
        }
    },
    () => {
        return {
            async: true,
        }
    }
)

So in this case I don't need to pass the product id to the rule