Source: email.service.js

/**
 *  @fileOverview A service that handles CRUD operations for user's emails
 *
 *  @author       Ralfs Lagzda
 *
 *  @requires     NPM:lodash
 *  @requires     ../models/email
 */
const _ = require('lodash');
const Email = require('../models/email');
/**
 * List all emails
 *
 * @memberOf EmailService
 * @function list
 * @param {Object} params the parameters to limit the query to desired results
 * @returns {Promise<Email[]>} Promise that eventually resolves an array
 * of emails or throws error
 */
const list = params => new Promise(async (resolve, reject) => {
  try {
    if (typeof (params) !== 'object' || _.isEmpty(params)) throw (Error('Invalid parameters'));
    resolve(await Email.find(params));
  } catch (err) {
    reject(err);
  }
});
/**
 * Create a email
 *
 * @memberOf EmailService
 * @function create
 * @param {String} userId the owner of the email
 * @param {Object} email the email object to create
 * @returns {Promise<Email>} Promise that eventually creates and resolves
 * a email or throws error
 */
const create = (userId, email) => new Promise(async (resolve, reject) => {
  try {
    const creatableEmail = await Object.assign(email, { createdBy: userId });
    const newEmail = await new Email(creatableEmail).save();
    resolve(newEmail);
  } catch (err) {
    reject(err);
  }
});
/**
 * Retrieves a single email by ID
 *
 * @memberOf EmailService
 * @function read
 * @param {String} emailId the ID of the email
 * @returns {Promise<Email>} Promise that eventually resolves a email or throws error
 */
const read = emailId => new Promise(async (resolve, reject) => {
  try {
    resolve(await Email.findById(emailId));
  } catch (err) {
    reject(err);
  }
});
/**
 * Updates a single email
 *
 * @memberOf EmailService
 * @function update
 * @param {String} emailId the ID of the email
 * @param {Object} body key/value pairs of the fields that should be changed
 * @returns {Promise<Email>} Promise that eventually updates and
 * resolves a email or throws error
 */
const update = (emailId, body) => new Promise(async (resolve, reject) => {
  try {
    const updatedEmail = await Object.assign(await Email.findById(emailId), body);
    resolve(await updatedEmail.save());
  } catch (err) {
    reject(err);
  }
});
/**
 * Deletes a single email
 *
 * @memberOf EmailService
 * @function del
 * @param {String} emailId the ID of the email
 * @returns {Promise} Promise that eventually deletes
 * an email or throws error
 */
const del = emailId => new Promise(async (resolve, reject) => {
  try {
    await Email.remove({ _id: emailId });
    resolve();
  } catch (err) {
    reject(err);
  }
});
/**
 * Find or Create a email
 *
 * @memberOf EmailService
 * @function findOrCreate
 * @param {String} userId the owner of the email
 * @param {Object} email the email object to create
 * @param {String} email.email the email string in the object
 * @returns {Promise<Email>} eventually creates and returns a
 * email or throws error
 */
const findOrCreate = (userId, email) => new Promise(async (resolve, reject) => {
  try {
    if (!email) return resolve('');
    const existingEmail = await Email.findOne({ email });
    if (!existingEmail) {
      const creatableEmail = await Object.assign({ email }, { createdBy: userId });
      return resolve(await new Email(creatableEmail).save());
    }
    return resolve(existingEmail);
  } catch (err) {
    return reject(err);
  }
});
/**
 * A service that handles CRUD operations for user's emails
 * @namespace EmailService
 */
module.exports = {
  list,
  create,
  read,
  update,
  del,
  findOrCreate,
};