Mongoose type "accessibleBy" returns an array of document after findOne

Model.accessibleBy from @casl/mongoose returns an array of document which makes it hard to deal with with operations such as findById and following:

        type CatDocument = Cat & Document

 	getById(id: MongooseTypes.ObjectId, ability: Ability): Promise<CatDocument> 
		return this.catModel
			.findById(id)
			.accessibleBy(ability, Action.Read)
                        // function return type now needs to be Promise<CatDocument[]>
			.exec()
	}

Update operations after find one (is there a better way to check ability before update?) trigger an error since it expects an array:

	async update(payload: UpdateCatInput, ability: Ability) {
		const doc = await this.catModel
			.findById(payload.id)
			.accessibleBy(ability, Action.Update)
			.exec()

		if (doc) return doc.set(payload).save() 
                // Error : Property 'set' does not exist on type '(Cat & Document<any, any, any> & { _id: ObjectId; })[]'
	}

[gterras]

I opened an issue at mongoose https://github.com/Automattic/mongoose/issues/12286

As a workaround you can use any findOne*method since findById is just an alias.

[gterras]

find().findByIdAndDelete() is not found but find().findOneAndDelete() is. I would advice not using these findById shorthands as they often create problems.