It is not always a guarantee that all promises in typescript will be resolved completely

I have a requirement in my code to update the model data

{
"customerCode": "CUS15168",
"customerName": "Adam Jenie",
"customerType": "Cash",
"printPackingSlip": "true",
"contacts": [
    {
        "firstName": "Hunt",
        "lastName": "Barlow",
        "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="c3abb6adb7a1a2b1afacb483b5acafa2bbeda0acae">[email protected]</a>",
        "deliveryAddress": "805 Division Place, Waumandee, North Carolina, 537",
    },
    {
        "firstName": "Barlow",
        "lastName": "Hunt",
        "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="28405d465c4a495a44475f685e47444950064b4745">[email protected]</a>",
        "deliveryAddress": "805 Division Place, Waumandee, North Carolina, 537",
    }
],
"deliveryAddress": [
    {
        "addressName": "Postal",
        "addressType": "postal address",
        "addressLine1": "plaza street",
        "addressLine2": "broome street",
        "suburb": "Guilford",
        "city": "Oneida",
        "state": "Colorado",
        "postalCode": "3971",
        "country": "Belarus",
        "deliveryInstruction": "test delivery address"
    },
    {
        "addressName": "Physical",
        "addressType": "physical address",
        "addressLine1": "plaza street",
        "addressLine2": "broome street",
        "suburb": "Guilford",
        "city": "Oneida",
        "state": "Colorado",
        "postalCode": "3971",
        "country": "Belarus",
        "deliveryInstruction": "test delivery address"
    }
]
}

To accomplish this, I utilized Promise.all. When testing with Postman, I observed that the customer and contact details need to be added first before updating the delivery addresses. Here's how I implemented it:

public async createCustomer(customer: CustomerDTO): Promise<CustomerDTO> {
    let deliveryAddress = [];
    let contacts = [];

    let customerDto = new CustomerDTO();

    // Code here

    return Promise.all([updatedAddress, updatedContacts]).
        then((results: [Promise<boolean>[], Promise<boolean>[]]) => {
            console.log(results);
            return this.customerRepo.getLastUpdatedCustomer();
        }).
        then((result) => {
            return result;
        }).
        catch(e => {
            console.error(e);
            return e;
        });
}

In customerRepository 

// Code for updating delivery address

// Problem description
mongodbtypescriptpromise

Answer №1

Make sure to pass the promises directly in a flat array structure.

Read about Promise.all on MDN here

If there are non-promise values within the iterable, they will be ignored but still counted in the resulting promise array value (if the promise is fulfilled)

You can achieve this easily by utilizing the spread operator.

let updatedAddress = deliveryAddress.map(async (address: CustomerDeliveryAddressDto) => {
  return await this.customerRepo.updateDeliveryAddress(address, customerDto, address._id);
});
let updatedContacts = contacts.map(async (contact: CustomerContactsDto) => {
  return await this.customerRepo.createOrUpdateContactList(contact, customerDto, contact._id);
});

// Remember to provide a flat array to Promise.all using the `...` spread operator.
return Promise.all([...updatedAddress, ...updatedContacts]).then(/* ... */

Moreover, as you are already working with async/await, it makes sense to also await the Promise.all function call.

const results = await Promise.all([...updatedAddress, ...updatedContacts]);
console.log(results);
return this.customerRepo.getLastUpdatedCustomer();

Answer №2

You have the option to also nest Promise.all for better code organization

let updatedAddresses = Promise.all(deliveryAddresses.map(async (deliveryAddress: CustomerDeliveryAddressDto) => {
  return await this.customerRepo.updateDeliveryAddress(deliveryAddress, customerData, deliveryAddress._id);
}));

let modifiedContacts = Promise.all(contacts.map(async (contact: CustomerContactsDto) => {
  return await this.customerRepo.createOrUpdateContactList(contact, customerData, contact._id);
}));


return Promise.all([updatedAddresses, modifiedContacts])

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