According to the docs: Currently the valid types in Mongoid are: Array, Boolean, Date, DateTime, Float, Integer, String, Time and any object that inherits from Mongoid::Document.

Apologies if I'm missing something obvious, but: How do I persist a document with a hash as a field? If I can't do this, is there a reason?

The two workarounds I can think of are: I could create a Mongoid::Document with a field for every possible key the hash might have, and use it instead (but this would grow unwieldy if there are hundreds of possible keys); or I could convert the hash to JSON, store it in a string field, and then convert it back as needed. The latter option would be easier, but would make no sense (why would you store a JSON string in MongoDB?) and would prevent me from making MongoDB queries within the hash.

Suggestions?