Using Async with MongoDb to fill collection documents in order

问题

I decided to use Async module to populate a mongodb collection in the order that I want.
Without Async the code works but the documents aren't inserted in the proper order:

function insertRowInBLD(ref, riskstatements, maximpact, controleffectiveness, recommendedriskrating, frequency, impact, validatedreviewriskrating, rationalforriskadjustment) {
    const businessLineDashboard = new BusinessLineDashboard({
        ref: ref,
        riskstatements: riskstatements,
        maximpact: maximpact,
        controleffectiveness: controleffectiveness,
        recommendedriskrating: recommendedriskrating,
        frequency: frequency,
        impact: impact,
        validatedreviewriskrating: validatedreviewriskrating,
        rationalforriskadjustment: rationalforriskadjustment
    });
    businessLineDashboard.save()
        .then(row => {
            console.log('row ' + businessLineDashboard.ref + ' has been inserted succesfully');
        })
        .catch(err => {
            console.log('err: ', err);
        });
}

I wanted the the "documents" to be inserted in that order. Because of the asynchronous nature of JavaScript, that didn't happen. So I tried to use

async.series:

function fillBLD() {
    async.series(
        [
            insertRowInBLD('R01', 'Disclosure of data due to deliberate action by internal actor', 'E. Not significant', 'Partially effective', 'Low', '', '', '', ''),
            insertRowInBLD('R02', 'Corruption of data due to deliberate action by internal actor', 'E. Not significant', 'Partially effective', 'Low', '', '', '', ''),
            insertRowInBLD('R03', 'Unavailability of data due to deliberate action by internal actor', 'E. Not significant', 'Partially effective', '', '', '', '', ''),
            insertRowInBLD('R04', 'Disclosure of data due to attack of the communications link by internal/external actor', 'E. Not significant', 'Partially effective', 'Low', '', '', '', ''),
            insertRowInBLD('R05', 'Corruption of data due to attack of the communications link by internal/external actor', 'E. Not significant', 'Partially effective', 'Low', '', '', '', ''),
        ]
    );
}

However, I keep getting this error:

ProjectPath\node_modules\mongodb\lib\utils.js:132 throw err; ^

TypeError: Cannot read property 'Symbol(Symbol.toStringTag)' of undefined

Any idea what may be causing this error and how can I fix it?
Thank you!

回答1:

your insertRowInBLD function has to return a Promise instance instead of undefined as now. Async.series is being passed an array of undefined.

This.

function fillBLD() {
    async.series(
        [
            insertRowInBLD('R01', 'Disclosure of data due to deliberate action by internal actor', 'E. Not significant', 'Partially effective', 'Low', '', '', '', ''),
            insertRowInBLD('R02', 'Corruption of data due to deliberate action by internal actor', 'E. Not significant', 'Partially effective', 'Low', '', '', '', ''),
            insertRowInBLD('R03', 'Unavailability of data due to deliberate action by internal actor', 'E. Not significant', 'Partially effective', '', '', '', '', ''),
            insertRowInBLD('R04', 'Disclosure of data due to attack of the communications link by internal/external actor', 'E. Not significant', 'Partially effective', 'Low', '', '', '', ''),
            insertRowInBLD('R05', 'Corruption of data due to attack of the communications link by internal/external actor', 'E. Not significant', 'Partially effective', 'Low', '', '', '', ''),
        ]
    );
}

is actually this.

function fillBLD() {
    async.series(
        [
            undefined,
            undefined,
            undefined,
            undefined,
            undefined
        ]
    );
}

来源：https://stackoverflow.com/questions/56773275/using-async-with-mongodb-to-fill-collection-documents-in-order

标签

javascript

mongodb

mongoose

async.js