module.exports = {
  attributes: {
    episode:{
      model:'episode'
    },
    book: {
      model: 'book'
    },
    sortOrder: {
      type: 'number'
    }
  },

  checkConsistency: async () => {
    var relations = await EpisodeBook.find().populate('episode').populate('book');
    relations = relations
      .filter(relation => relation.episode==null || relation.book==null)
      .map(relation => relation.id);
    await EpisodeBook.destroy({id: relations});
  }
}