obey/src/lib/error.js

Data modelling and validation library

/*
 * Copyright (c) 2015 TechnologyAdvice
 */
const util = require('util')

/**
 * Compiles array items into string error messages
 * @param {Array<{type: string, sub: string|number, key: string, value: *, message: string}>} msgObjs Original array
 * of error message objects
 * @returns {Array<string>}
 */
const getMessages = (msgObjs) => {
  const messages = []
  msgObjs.forEach(obj => {
    messages.push((obj.key ? `${obj.key} (${obj.value}):` : `${obj.value}:`) + ` ${obj.message}`)
  })
  return messages
}

/**
 * Creates ValidationError object for throwing
 * @param {Array<{type: string, sub: string|number, key: string, value: *, message: string}>} message Raw array of
 * error objects
 */
function ValidationError(message) {
  Object.defineProperty(this, 'name', { value: 'ValidationError' })
  Object.defineProperty(this, 'message', { value: getMessages(message).join('\n') })
  Object.defineProperty(this, 'collection', { value: message })

  // Fixes captureStackTrace missing on Safari
  if (typeof Error.captureStackTrace === 'function') {
    Error.captureStackTrace(this, ValidationError)
  } else {
    this.stack = new Error().stack
  }
}

// Creates instance of ValidationError as Error object
util.inherits(ValidationError, Error)

module.exports = ValidationError