/*
 * Fire/collection docs use `idGeneration: 'MONGO'`, so their `_id` is a
 * `Mongo.ObjectID`, whose `.toString()` yields `ObjectID("<hex>")` — NOT the
 * bare hex. Interpolating an `_id` straight into a URL or any string therefore
 * produces `.../fire/archive/ObjectID("...")`, which the routes can't match.
 *
 * Use `hexId()` wherever an id becomes part of a string (URLs, comment
 * reference ids, DOM ids). It returns the 24-char hex for an ObjectID and
 * passes plain-string ids through unchanged. Do NOT use it for DDP method
 * args whose `check()` expects `Meteor.Collection.ObjectID` — pass the object.
 */
export const hexId = id =>
  (id && typeof id.toHexString === 'function' ? id.toHexString() : id);

export default hexId;