Question 118527 in Mongodb Question posted in
The official documentation can be found here.

Mongodb – Why am I getting undefined while accessing an array inside an object?

let newdata = await tripModel.find(
{ tripId: ID },
{salesOrder:1, no: "$deliveryDetails.invoiceNo", _id: 0 }
);

let nullInvoices = [];

console.log("vvvvvvv", newdata[0].salesOrder);
for (let i = 0; i < newdata[0].no.length; i++) {
  if (newdata[0].no[i] === null)
    nullInvoices.push({
      SO: newdata[0].salesOrder[i],
      invoice: newdata[0].no[i],
    });
}`

//error: vvvvvvv {
salesOrder: [
623d917d4c9f21730ace6256,
623da8bbeae48b2f34372a95,
623da8bbeae48b2f34372a92,
623d98964c9f21730ace642c
],
no: [ null, ‘0900009293’, ‘0900009294’, null ] }
reason TypeError: Cannot read properties of undefined (reading ‘length’)

I need to access "no", but it is throwing as undefined.

Tags:

2

Answers


  1. 0

    Since your

    console.log("vvvvvvv", newdata[0].salesOrder); statement returns

    {
    salesOrder: [ 623d917d4c9f21730ace6256, 623da8bbeae48b2f34372a95, 623da8bbeae48b2f34372a92, 623d98964c9f21730ace642c ],
    no: [ null, '0900009293', '0900009294', null ],
}

    your iteration must be like as below

    let nullInvoices = [];

console.log("vvvvvvv", newdata[0].salesOrder);
for (let i = 0; i < newdata[0].salesOrder.no.length; i++) {
  if (newdata[0].salesOrder.no[i] === null)
    nullInvoices.push({
      SO: newdata[0].salesOrder.salesOrder[i],
      invoice: newdata[0].salesOrder.no[i],
    });
}

    Sample Implementation

    const newdata = [{}];

newdata[0].salesOrder = {
  salesOrder: ['623d917d4c9f21730ace6256', '623da8bbeae48b2f34372a95', '623da8bbeae48b2f34372a92', '623d98964c9f21730ace642c'],
  no: [null, '0900009293', '0900009294', null],
}

let nullInvoices = [];

for (let i = 0; i < newdata[0].salesOrder.no.length; i++) {
  if (newdata[0].salesOrder.no[i] === null)
    nullInvoices.push({
      SO: newdata[0].salesOrder.salesOrder[i],
      invoice: newdata[0].salesOrder.no[i],
    });
}

console.log(nullInvoices);
    Login or Signup to reply.
  2. 0

    Actually, you can make an invoices object first, and then filter it by any condition:

    const data = {salesOrder: [ '623d917d4c9f21730ace6256', '623da8bbeae48b2f34372a95', '623da8bbeae48b2f34372a92', '623d98964c9f21730ace642c'],no: [ null, '0900009293', '0900009294', null ]};

const invoices = data.salesOrder
  .map((SO, index) => ({ SO, invoice: data.no[index] }));

const nullInvoices = invoices
  .filter(({ invoice }) => invoice === null);
  
console.log(nullInvoices);
    .as-console-wrapper{min-height: 100%!important; top: 0}
    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search