[Suggestion] Allow refs to be something other than ObjectID types

[mattjennings]

typegoose/src/prop.ts

Lines 86 to 93 in 2ffe774

	if (ref) {
	schema[name][key] = {
	...schema[name][key],
	type: mongoose.Schema.Types.ObjectId,
	ref: ref.name,
	};
	return;
	}

Ran into a CastError when referencing schemas that use _id as a number instead of ObjectID. Other valid types are Number, String, and Buffer

I might be able to take a stab at it this weekend.

[mattjennings]

Created a pull request #148

[hasezoey]

@Ben305 this can be closed because all the PR's for this got closed / merged (into v6.0.0)