Query in an array of objects using findOne not working

Question

Using this in mongoose:

const motherLevel = await db.Mother.findOne({});

const b = motherLevel.cards[level];

console.log(b);

I get this array:

[ { cards: [ [Object] ], _id: 60ef57c59f44361488e5cf96, unit: 1 } ]

Then I want to get the object inside based on unit: 1 so I use this one:

const c = motherLevel.cards[level].findOne({ unit: 1 });

But it doesn't return any result!!!

How can I fix this?

EDIT:

I have this structure in my collection (Note that I have only this single collection and I want to push some data into the cards nested deeply inside)

As you see I want to go to each of the levels first for instance into the starter level in our case...

Then I want to pick the unit 1 and push a new card into the cards which is a part of the unit one object right?

So far I can get the level which is the array containing different units but I cannot pick that unit to push my card into it...

It would either say undefined or an empty array or null or maybe throw an error. I don't think it will return nothing right? — Tushar Shahi
– Tushar Shahi, Commented Jul 15, 2021 at 14:45

Arvind Pal · Accepted Answer · 2021-07-17 15:13:16Z

1

You are using findOne on a javascript array but findOne is a method of mongoose/mongodb at following line

const c = motherLevel.cards[level].findOne({ unit: 1 });

if you want find that unit 1 is exists in the motherLevel.cards array you should use following, this will return the first match of card that have unit 1

const c = motherLevel.cards.find(card=>c.unit===1)

or if you want to all cards that have unit 1 you can use filter like following, this will return all the cards that have unit 1

const c = motherLevel.cards.find(card=>c.unit===1)

answered Jul 17, 2021 at 15:13

Arvind Pal

5213 silver badges16 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Query in an array of objects using findOne not working

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related