The Mongoose findOne function encountered an error when attempting to convert a value to ObjectId

Trying to solve a perplexing exception that has left me scratching my head for over an hour.

Error message: CastError: Cast to ObjectId failed for value "[email protected]" at path "_id" for model "Account"

My goal is to fetch an Account using the email address. Here is the query I am using:

export async function getPendingRecipients(user_id, email_address) {
    const account = await Account
        .find({email: email_address})
        .exec();

    return true;
}

Below is the Schema object I am working with:

const userGmailSchema = new Schema({
    id: {
        type: String,
        unique: true
    },
    displayName: String,
    image: Object,
    accessToken: String,
    user: {
        type: Schema.Types.ObjectId,
        ref: 'User'
    },
    refreshToken: {
        type: String,
        default: null
    },
    email: {
        type: String,
        unique: true
    },
    emails: [
        {
            type: Schema.Types.ObjectId,
            ref: 'Emails'
        }
    ]
});

Answer №1

It seems like the issue may be related to including an id field in your schema.

In MongoDB, the primary key is represented by the _id field, which is of type ObjectId. In Mongoose, the id field serves as a virtual getter for the _id field, essentially acting as an alias for it.

One small difference worth noting is that while _id returns an ObjectId, id returns a string version of the _id.

By default, Mongoose handles the _id field automatically, so there is usually no need to explicitly define an id field in the schema.

If you are using the id field as a primary key akin to an ID in a SQL database, simply remove it from the Mongoose schema. If id serves a different purpose in your application, consider either disabling the virtual getter or renaming it:

const userSchema = new Schema({
    // Define your schema fields here
}, 
{
    { id: false }  // Disable the virtual getter for `id`
})

For more information, you can refer to the official Mongoose documentation on handling IDs.

I hope this clarifies things for you.

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