All files / Zapcard_API/services description.service.js

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