vulcan-reusability-addField.js

VendingMachines.addField([
    {
    fieldName: 'lastRefillAt',
    fieldSchema: {
        type: Date,
        optional: true,
        viewableBy:['runners', 'managers', 'admins'],
        resolveAs: {
            type: 'Date',
            resolver(vendingMachine, args, context) {
                const lastRefill = context.Refills.find(
                    { vendingMachineId: vendingMachine._id },
                    {
                        fields: { 'date': 1 },
                        sort: { date: -1},
                        limit: 1
                    }
                ).fetch()
                if (!lastRefill.length) return vendingMachine.createdAt
                return lastRefill[0].date
            }
        }
    }
 })