knex.transaction(function(trx) {
    var books = [
        {title: 'Canterbury Tales'},
        {title: 'Moby Dick'},
        {title: 'Hamlet'}
    ];

    return trx
    .insert({name: 'Old Books'}, 'id')
    .into('catalogues')
    .then(function(ids) {
    return Promise.map(books, function(book) {
        book.catalogue_id = ids[0];

        // Some validation could take place here.

        return trx.insert(info).into('books');
    });
    });
})

knex.transaction(function(trx) {
   knex('foo')
  .transacting(trx)
  .insert({id:"bar", username:"bar"})
  // etc
 })