utils.js

import errors from '@feathersjs/errors';

exports.isPlainObject = obj => {
  return obj && obj.constructor === {}.constructor;
};

exports.extractIds = (id, idKey, idSeparator) => {
  if (typeof id === 'object') { return idKey.map(idKey => id[idKey]); }
  if (id[0] === '[' && id[id.length - 1] === ']') { return JSON.parse(id); }
  if (id[0] === '{' && id[id.length - 1] === '}') {
    const obj = JSON.parse(id);
    return Object.keys(obj).map(key => obj[key]);
  }

  if (typeof id !== 'string' || !id.includes(idSeparator)) { throw new errors.BadRequest('When using composite primary key, id must contain values for all primary keys'); }

  return id.split(idSeparator);
};