orderObjectFields

gistfile1.txt

const _ = require('lodash');

function orderObjectFields(input) {
  if (!input) {
    return input;
  }

  if (_.isString(input)) {
    return input;
  } else if (_.isArray(input)) {
    let tmp = [];
    input.forEach((item) => {
      item = orderObjectFields(item);
      tmp.push(item);
    });
    return tmp;
  } else if (_.isObject(input)) {
    let tmp = {};

    let tmpKeys = Object.keys(input);
    tmpKeys = tmpKeys.sort(); // abc....
    tmpKeys = tmpKeys.sort((a, b) => { // _id fields first
      if (a.slice(-3) === '_id' && b.slice(-3) !== '_id') {
        return -1;
      }
      if (a.slice(-3) !== '_id' && b.slice(-3) === '_id') {
        return 1;
      }
      return 0;
    });

    tmpKeys = tmpKeys.sort((a, b) => { // _at fields last
      if (a.slice(-3) === '_at' && b.slice(-3) !== '_at') {
        return 1;
      }
      if (a.slice(-3) !== '_at' && b.slice(-3) === '_at') {
        return -1;
      }
      return 0;
    });

    tmpKeys.forEach((key) => {
      tmp[key] = input[key];
    });

    return tmp;
  }

  return input;
}

module.exports = orderObjectFields;