const validator = Joi.object({
            name: Joi.string(),
            pricing_formula: Joi.string(),
            period: Joi.string().valid(Object.keys(this.model.PERIODS)).allow(null),
            is_active: Joi.boolean(),
            formula_variables: Joi.array().items(Joi.object({
                name: Joi.string(),
                type: Joi.string().valid(Object.keys(models.PricingFormulaVariable.TYPES)),
                value: Joi.alternatives().when('type', {
                    is: models.PricingFormulaVariable.TYPES.constant_map,
                    then: Joi.object({
                        default: Joi.number().integer().min(0)
                    }).required()/*.pattern(/[\w\d]+/, Joi.number().integer().min(0))*/,
                    otherwise: Joi.number().integer().min(0)
                }),
            })).unique((a, b) => a.name === b.name)
        }).options({
            allowUnknown: false,
            abortEarly: false,
            presence: 'required'
        });

const validatedBody = Joi.attempt({
                name: 'hello',
                pricing_formula: 'a + b + c',
                period: null,
                is_active: true,
                formula_variables: [
                    {
                        name: 'a',
                        type: 'variable',
                        value: 100
                    },
                    {
                        name: 'b',
                        type: 'constant',
                        value: 0
                    },
                    {
                        name: 'c',
                        type: 'constant_map',
                        value: '{}'
                    }
                ]
            }, validator);