m.validator.js

m.validator = function (model, validations) {
  this.errors = {}
  this.validations = validations
  this.model = model
}

m.validator.prototype.hasErrors = function () {
  return Object.keys(this.errors).length
}

m.validator.prototype.hasError = function (prop) {
  return this.errors[prop]
}

m.validator.prototype.clearErrors = function () {
  this.errors = {}
}

m.validator.prototype.validate = function () {
  this.clearErrors()

  for( var key in this.validations ){
    var validator = this.validations[key]
    var value = this.model[key]()
    var result = validator.bind(this.model)(value)

    if (result) {
      this.errors[key] = result
    }
  }

  return self
}