2 replies

Using mongodb adapter and generateId creates id field in addition to _id field

hunita · 2025-03-22T16:43:58.728Z

using this config: ```ts import { createId } from '@paralleldrive/cuid2' const auth = betterAuth({ // ... database: mongodbAdapter(client.db()), advanced: { generateId: () => return createId() } }) ``` leads to user documents having the following form: ```ts // user { "_id": ObjectId('67dee48723670eccd7f45380'), "id": "g966fyld09zcrhbq7v6wiib1", "name": " ... ", // ... } ``` This seems to be intended behavior, but I would like to be able to override `_id` entirely. Is this possible?

using this config:

import { createId } from '@paralleldrive/cuid2'

const auth = betterAuth({
  // ...
  database: mongodbAdapter(client.db()),
  advanced: {
    generateId: () => return createId()
  }
})

import { createId } from '@paralleldrive/cuid2'

const auth = betterAuth({
  // ...
  database: mongodbAdapter(client.db()),
  advanced: {
    generateId: () => return createId()
  }
})

leads to user documents having the following form:

// user
{
  "_id": ObjectId('67dee48723670eccd7f45380'),
  "id": "g966fyld09zcrhbq7v6wiib1",
  "name": " ... ",
  // ...
}

// user
{
  "_id": ObjectId('67dee48723670eccd7f45380'),
  "id": "g966fyld09zcrhbq7v6wiib1",
  "name": " ... ",
  // ...
}

This seems to be intended behavior, but I would like to be able to override

_id

_id

entirely. Is this possible?

Better Auth•11mo ago•

2 replies

hunita

Using mongodb adapter and generateId creates id field in addition to _id field

using this config:

import { createId } from '@paralleldrive/cuid2'

const auth = betterAuth({
  // ...
  database: mongodbAdapter(client.db()),
  advanced: {
    generateId: () => return createId()
  }
})

import { createId } from '@paralleldrive/cuid2'

const auth = betterAuth({
  // ...
  database: mongodbAdapter(client.db()),
  advanced: {
    generateId: () => return createId()
  }
})

leads to user documents having the following form:

// user
{
  "_id": ObjectId('67dee48723670eccd7f45380'),
  "id": "g966fyld09zcrhbq7v6wiib1",
  "name": " ... ",
  // ...
}

// user
{
  "_id": ObjectId('67dee48723670eccd7f45380'),
  "id": "g966fyld09zcrhbq7v6wiib1",
  "name": " ... ",
  // ...
}

This seems to be intended behavior, but I would like to be able to override

_id

_id

entirely. Is this possible?

Using mongodb adapter and generateId creates id field in addition to _id field

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