hapi joi filter valid value

Question

Is there a way to do the same

var item = new Item(request.payload);
item.tags = _.map(item.tags, function(s){
    return s.trim().toLowerCase();
}); 

in the validation code ?

var Joi = require('joi'),
    Tags = Joi.array().min(1).max(3).unique().required();
exports.create = {
   payload: {
    tags: Tags
   }
};

Answer 1

此验证架构应工作：

Joi.array().items(Joi.string().trim().lowercase()).unique().min(1).max(3).required();