router.put('/:id', authorize(), async (req, res, next) => {
  // Destructure objects and lists as separate variables to be used in list updaters
  const {
    params: { id },
    body: {
      params: {
        guide: passedGuide,
        sections: passedSections,
      },
    },
  } = req;
  // The spread function is like .complete, but works with lists of objects.
  const guide = (id === 'create')
    ? await Guide.create(passedGuide)
    : await Guide.find({ where: { id }, includes: [Section] });
  guide.update(passedGuide);
  // simple maps on lists of objects into Sequelize calls. Anything more complicated should be
  // pulled out into another invocation
  await Promise.all(passedSections.map(passedSection => (
    Section.findOrCreate({
      // you need all database-required params in this where clause, otherwise it'll fail
      // I'd love to see more use of required fields at the database level, easiest way to
      // ensure clean data
      where: {
        id: passedSection.id,
        guide_id: guide.id,
        type: passedSection.type,
        order: passedSection.order,
      },
    }).spread(s => s.update({ ...passedSection }))
  )));
  // This doesn't facilitate section deletions. Need another query
  // to grab all sections and remove the ones that weren't passed.
  guide.getGuides_sections().spread((section) => {
    const found = _.find(passedSections, passedSection => (
      passedSection.id === section.id
    ));
    if (typeof found === 'undefined') { section.destroy(); }
  });
  res.send(GuideView.get(guide));
  return next();
});