javascript - how to set mongo objectId field to null or empty or even delete the field? - Stack Overflow

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My Modal :

{
  "name":{type:String,required:true},
  "category":{type:mongoose.Schema.Types.ObjectId,ref:"Category"}
}

I have a document created using this modal and the document looks like:

{
  "_id":ObjectId("5dsfkjh2r74dsjdhf3r4f"),
  "name":"demo 1",
  "category":ObjectId("5ae9dlkj32nds6n37cj23")
}

If I try to change the category field, for eg:

• document.category = ''
• document.category = null
• document.category = undefined

I'm getting the following error:

Cast toObjectId failed ...

I need to unset the "category" field to null or empty or even delete it. How to do that?

My Modal :

{
  "name":{type:String,required:true},
  "category":{type:mongoose.Schema.Types.ObjectId,ref:"Category"}
}

I have a document created using this modal and the document looks like:

{
  "_id":ObjectId("5dsfkjh2r74dsjdhf3r4f"),
  "name":"demo 1",
  "category":ObjectId("5ae9dlkj32nds6n37cj23")
}

If I try to change the category field, for eg:

• document.category = ''
• document.category = null
• document.category = undefined

I'm getting the following error:

Cast toObjectId failed ...

I need to unset the "category" field to null or empty or even delete it. How to do that?

• javascript
• node.js
• mongodb
• mongoose

Share Improve this question Follow edited Mar 16, 2018 at 10:21 Philipp Maurer 2,50566 gold badges2020 silver badges2626 bronze badges asked Mar 16, 2018 at 9:59 DineshDinesh 3311 gold badge11 silver badge55 bronze badges

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3 Answers 3

Sorted by: Reset to default 5

Try unsetting the document

document.update({_id: "5dsfkjh2r74dsjdhf3r4f"}, {$unset: {category: 1 }});

or

document.update({_id: ObjectId("5dsfkjh2r74dsjdhf3r4f")}, {$unset: {category: 1 }});

ObjectId should be a 24 length string which I guess your id is not. That's why mongo cannot convert it into valid ObjectId.

One solution would be to generate 24 character valid ObjectId for category field. Other would be to set category as a simple String instead of ObjectId

Use Below line document.category = new MongoDB\BSON\ObjectID('');

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