Saving embedded ObjectId as null

[mikebarnhardt]

I have searched and tested for a solution to no avail.

I need to update the following document

DocumentSchema = new mongoose.Schema({
    title: String,
    content: String,
    related: [{ type: mongoose.Schema.Types.ObjectId, ref: 'Document' }],
});

I use Document.findOne and then _.extends(doc, req.body) before doc.save() to update so that I can still use validation and middlewares. This method has worked fine with other documents until now.

Related is not required and if it is left empty I get the following error:

{ message: 'Cast to ObjectId failed for value "" at path "related"',
  name: 'CastError',
  type: 'ObjectId',
  value: [  ],
  path: 'related' }

I have tried

delete doc.related;

doc.related = null;

doc.related = [];

doc.set(related, null, Object);

And numerous other variations and still get the same error. I console.log(doc) everytime and most of the time the related field stays [] but even when it shows related: null it still won't save and gives me the same error.

So basically, the question is how do I save when the array of ObjectId's is null/empty?

Thanks

[aheckmann]

could you post something I can run? this will aid me in understanding this ticket.

[mikebarnhardt]

It seems to me like any schema I created after a certain point updated fine and a select few wouldn't update properly. I'm thinking I changed the schema or inserted into the database using $set and not $push for the arrays.

I no longer have the code anyways (weird git app error). I'll consider the matter closed for now and reopen if I run into it later with some working code.

[burakkilic]

I have the same problem. My schema is:

var CategorySchema = new Schema({
name: {
tr: {type : String, default : '', trim : true},
en: {type : String, default : '', trim : true},
fr: {type : String, default : '', trim : true},
es: {type : String, default : '', trim : true},
ru: {type : String, default : '', trim : true},
ar: {type : String, default : '', trim : true},
pr: {type : String, default : '', trim : true}
},
description: {
tr: {type : String, default : '', trim : true},
en: {type : String, default : '', trim : true}
},
subcategories:[{type : Schema.ObjectId, ref : 'Category', null: true}],
parent: {type : Schema.ObjectId, ref : 'Category'},
products:[{type : Schema.ObjectId, ref : 'Product'}],
images : [String],
order: {type : Number, default: 0},
createdAt : {type : Date, default : Date.now},
locale: {type : String, enum: ['tr', 'en', 'fr','es','ru','ar','pr'], null: false}

})

When saving the object, I am getting:

Cast to ObjectId failed for value "" at path "parent"

I cannot save the document if the parent is null.