cosmer/api/models/photosModel.js

**¡Aplicaciones para dispositivos moviles

const db = require('../adapter')

function find ({id, favs = []}) {
  const photo = db.get('photos').find({id: +id}).value()
  return {
    ...photo,
    liked: favs.includes(id.toString())
  }
}

function addLike ({ id }) {
  return db.get('photos').find({id: +id}).update('likes', likes => likes + 1).write()
}

function removeLike ({ id }) {
  return db.get('photos').find({id: +id}).update('likes', likes => likes - 1).write()
}

function list ({categoryId, ids, favs = []}) {
  let photos
  if (categoryId && categoryId !== 'all') {
    photos = db.get('photos').filter({categoryId: +categoryId}).value()
  } else if (ids) {
    photos = db.get('photos').filter(photo => ids.includes(photo.id.toString())).value()
  } else {
    photos = db.get('photos').value()
  }

  return photos.map(photo => ({
    ...photo,
    liked: favs.includes(photo.id.toString())
  }))
}

module.exports = { find, addLike, removeLike, list }