Switch to Buffer when using Binary in Mongoose

[alokrajiv]

Referencing from my Issue #8

[cdimascio]

@alokrajiv does this work for you? I'm having issues with it in my environment

[alokrajiv]

@cdimascio yes, we have been using a helper function like this now for quite some time. No issues:

export function attachPKUUID(schema: mongoose.Schema) {

  // add buffer to store a BSON UUID
  schema.add({
    _id: {
      type: Buffer,
      default: () => MUUID.v4(),
    },
  });

  // no need for auto getter for _id will add a virtual later
  schema.set("id", false);

  // virtual getter for custom _id
  schema.virtual("id")
    .get(function () {
      return MUUID.from(this._id.toBSON()).toString();
    })
    .set(function (val: string) {
      this._id = MUUID.from(val);
    });

}

whats the issue in your environment ?

[cdimascio]

When i use the above, i get the following error

/Users/cdimascio/git/uuid-mongodb/example/node_modules/mongoose/lib/schema/buffer.js:184
  throw new CastError('buffer', value, this.path);
  ^
CastError: Cast to buffer failed for value "Binary {
  _bsontype: 'Binary',
  sub_type: 4,
  position: 16,
  buffer: <Buffer 93 08 c9 15 22 77 4b af 8c d8 6d 75 05 53 df c5>,
  toString: [Function: bound ] }" at path "_id"
    at new CastError (/Users/cdimascio/git/uuid-mongodb/example/node_modules/mongoose/lib/error/cast.js:29:11)
    at SchemaBuffer.cast (/Users/cdimascio/git/uuid-mongodb/example/node_modules/mongoose/lib/schema/buffer.js:184:9)
    at SchemaBuffer.SchemaType.applySetters (/Users/cdimascio/git/uuid-mongodb/example/node_modules/mongoose/lib/schematype.js:969:12)
    at SchemaBuffer.SchemaType.getDefault (/Users/cdimascio/git/uuid-mongodb/example/node_modules/mongoose/lib/schematype.js:916:25)
    at $__applyDefaults (/Users/cdimascio/git/uuid-mongodb/example/node_modules/mongoose/lib/document.js:375:22)
    at model.Document (/Users/cdimascio/git/uuid-mongodb/example/node_modules/mongoose/lib/document.js:150:5)
    at model.Model (/Users/cdimascio/git/uuid-mongodb/example/node_modules/mongoose/lib/model.js:97:12)
    at new model (/Users/cdimascio/git/uuid-mongodb/example/node_modules/mongoose/lib/model.js:4425:15)
    at Object.<anonymous> (/Users/cdimascio/git/uuid-mongodb/example/ex2-mongoose.js:41:15)

In order to solve it in my environment, I did the following:

// 1. Define a simple schema
const kittySchema = new mongoose.Schema({
  _id: {
    type: 'object',
    value: { type: 'Buffer' },
    default: () => MUUID.v4(),
  },
  title: String,
});

Note, i'm using mongoose v5.7.5 and v3.3.4". What are you using?
For reference, my full example is here