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Updating document with id from other action using previous id (nodejs & mongodb)

May 11, 2023

I have something I cant find a solution for …
Let me explain in in short:
Step 1. Create a new collection in document A
Step 2. Use this id and create a new collection in document B
Step 3. Update collection from step 1 with the id from step2

In nodejs:

DocumentA.create({something})
.then((result)=>{
DocumentB.create({x : result.id})})
.then((result2) => { 
DocumentA.updateOne({_id: ?????}, {$set:{y: result2.id}})

And completely stuck here (at the ????) as I cannot use ‘result’ anymore.

>Solution :

I would encourage switching to using async/await but you can do something like this:

DocumentA.create({something})
.then((result)=>{
   return Promise.All([
     Promise.resolve(result), 
     DocumentB.create({x : result.id})
   ])
.then(([result, result2]) => { 
  DocumentA.updateOne({_id: result._id, {$set:{y: result2.id}
})

The primary thing is to use return <Promise> to pass to the next .then