CODEWITHSUNDEEP
node.jsmongodbmongoose
Vibhum Bhardwaj
Vibhum Bhardwaj

Reputation: 92

Mongoose: Cast to array of object failed for value [{"someKey": "someValue"}]

I'm getting error whenever I'm trying to save into my database a document with this schema:

var schemaForBooks = new Schema({
    book: String,
    author: String,
    who_has_this: Object,
    points: Number,
    upvoted_by_users: [Schema.Types.ObjectId],
    downvoted_by_users: [Schema.Types.ObjectId]
});

Rest all is good, but putting anything into upvoted_by_users or downvoted_by_users, I get this error:

[ERROR] Trace- CastError: Cast to [ObjectId] failed for value "[{"userName":"Vibhu","userId":"3833d1g870feaf4a38723"}]" at path "upvoted_
by_users"

I'm pretty sure I'm doing something wrong with the schema itself, but I don't know what.

Any help would be appreciated.

Upvotes: 2

Views: 1341

Answers (1)

boehm_s
boehm_s

Reputation: 5544

The error says that you're trying to cast the following array of object {"userName":"Vibhu", "userId":"3833d1g870feaf4a38723"} to an array of ObjectId.

So, you need to get rid of the userName field, so you can turn your array of String + ObjectId to an array of ObjectId.

You can do it with the Array#map method on your js Array, for example : 

var arr = [{"userName":"Vibhu","userId":"3833d1g870feaf4a38723"}];
var myCorrectArr = arr.map(field => field.userId);

Hope it helps,
Best regards,

Upvotes: 1

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