Learning_GCP_Datastore.js

// Copyright 2017, Google, Inc.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

'use strict';

const config = require("../config");


// Load the @google-cloud/datastore module
const { Datastore } = require("@google-cloud/datastore");


const ds = new Datastore({
    projectId: config.get('GCLOUD_PROJECT')
})


const kind = "Question"


function create({ quiz, author, title, answer1, answer2, answer3, answer4, correctAnswer }) {


    const key = ds.key(kind);

    const entity = {
        key,
        data: [
            { name: 'quiz', value: quiz },
            { name: 'author', value: author },
            { name: 'title', value: title },
            { name: 'answer1', value: answer1 },
            { name: 'answer2', value: answer2 },
            { name: 'answer3', value: answer3 },
            { name: 'answer4', value: answer4 },
            { name: 'correctAnswer', value: correctAnswer },
        ]
    }

    return ds.save(entity);

}


// Lists all questions in a Quiz (defaults to 'gcp').
// Returns a promise
// [START list]
function list(quiz = 'gcp') {

    const query = ds.createQuery(kind);

    const queryPromise = ds.runQuery(query);


    return Promise.resolve(
        queryPromise.then((response) => {

            const [data, { moreResults }] = response;

            const questions = data.map((value) => {
                return {
                    id: value[ds.KEY].id,
                    title: value.title,
                    answer1: value.answer1,
                    answer2: value.answer2,
                    answer3: value.answer3,
                    answer4: value.answer4,
                }
            });

            return {
                questions: questions,
                nextPageToken: moreResults,
            }
        })
    );


}
// [END list]


// [START exports]
module.exports = {
    create,
    list
};
// [END exports]