CODEWITHSUNDEEP
node.jsmongodbmongooseschema
EKnot
EKnot

Reputation: 306

Schema relations: Argument passed in must be a single String of 12 bytes or a string of 24 hex characters

So I'm trying to make some realtions with mongoose. But when it comes to saving one schema to an other I get this error:

Argument passed in must be a single String of 12 bytes or a string of 24 hex characters

Here are some similar Schemas:

mongoose = require('mongoose')
const Schema = mongoose.Schema

const userSchema = new Schema({
    _id: String,
    role: {
        type: String,
        default: 'Player'
    },
    tags: {
        type: [Schema.Types.ObjectId],
        ref: 'Tag'
    }
})

module.exports = mongoose.model('User', userSchema)

mongoose = require('mongoose')
const Schema = mongoose.Schema

const tagSchema = new Schema({
    _id: {
        type: String,
        require: true
    },
    description: {
        type: String,
        require: true
    },
    color: {
        type: String,
        default: '#2476d1'
    }
})

module.exports = mongoose.model('Tag', tagSchema)

And how I'm trying to link

try {
    const tag = await Tag.findOne({_id: 'Noob'})

    user.tags.push(tag.id)
    await user.save()
} catch (err) {
    console.error(`ERROR: ${user._id} at Noob check`)
    console.error(err)
}

According to other posts I've also tried pushing the _id like that:

user.tags.push(mongoose.ObjectID(tag._id))
// and
user.tags.push(mongoose.ObjectID.createFromHexString('4e6f6f62')) // just 'Noob' in hex

And I still get that error. How can I create a reference with a custom _id?

Upvotes: 1

Views: 1017

Answers (1)

Tom Slabbaert
Tom Slabbaert

Reputation: 22296

You just have a type mis-match, an ObjectId has certain structure restriction for Mongo. The string 4e6f6f62 does not match these restrictions.

Just change your user schema tags field to string:

tags: {
        type: String,
        ref: 'Tag'
    }

And just keep the creation as is without trying to cast the string into ObjectId. If for some reason there's a specific reason you want it to be ObjectId you'll have to re-save the tag collection and conver the _id to a valid ObjectId format.

Upvotes: 1

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