{ enum: true } option for queries or perhaps Model.validate

[IslandRhythms]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the feature has not already been requested

🚀 Feature Proposal

Currently, when you query for values not included in an enum, no warnings or errors are thrown. We have strictQuery which checks the keys, but we don't have something similar for values.

Motivation

Sometimes when working on multiple project with similar designs, names can be confused i.e. done versus completed or in_progress vs in-progress

Example

TestModel.find(filter, { enum: true });

[vkarpov15]

In general, I think this is a good idea. But implementation is trickier than you might expect because you also need to handle $in, $ne, etc. Similarly, I don't think we should check enum values by default because users may intentionally check for invalid enum values.

If you're willing to exclude query filters like $in, then Model.validate() works: https://playground.mongoosejs.io/#YXdhaXQgbW9uZ29vc2UuY29ubmVjdCgnbW9uZ29kYjovL2xvY2FsaG9zdDoyNzAxNy9tb25nb29zZV90ZXN0Jyk7CmNvbnN0IHNjaGVtYSA9IG5ldyBtb25nb29zZS5TY2hlbWEoeyBuYW1lOiB7IHR5cGU6IFN0cmluZywgZW51bTogWydmb28nLCAnYmFyJ10gfSB9KTsKY29uc3QgVGVzdE1vZGVsID0gbW9uZ29vc2UubW9kZWwoJ1Rlc3QnLCBzY2hlbWEpOwoKY29uc3QgZmlsdGVyID0geyBuYW1lOiAnYmF6JyB9Owphd2FpdCBUZXN0TW9kZWwudmFsaWRhdGUoZmlsdGVyKS5jYXRjaChlcnIgPT4gY29uc29sZS5sb2coZXJyKSk7

Might be interesting to implement a Model.validateFilter() function that validates a filter though.