question: creating an OrderedDocument with insert without supplying a key ? about bson-rust HOT 4 CLOSED

Hmm. I don't quite understand what you are about to do....

You are going to create an OrderedDocument from a bson::Bson, what is the actual subtype of that bson::Bson? Bson::Document?

from bson-rust.

ah sorry I wasn't very clear; a bit new to rust as well so can't formulate types that well yet :O

It is a Bson::Document, yes. And I want to be able to create an OrderedDocument from it. Preferably with just the doc! macro. But I can't figure out if there is a way to do that without supplying the key.

from bson-rust.

hi! A Bson::Document is a wrapper around an OrderedDocument, so you can convert by pattern-matching and pulling out the inner OrderedDocument (if it is a Bson::Document.)

To move the document out of the Bson enum (value cannot be used after this):

let inner_doc = match value {
  Bson::Document(doc) => doc,
   _ => panic!("expected a Bson::Document")
};

conditionally:

if let Bson::Document(inner_doc) = value {
  generate_schema_from_doc(inner_doc)
}

If you need to maintain the original Bson::Document, you can get a reference to the document:

// provided helper function from https://github.com/zonyitoo/bson-rs/blob/master/src/bson.rs#L500
// alternatively: value.as_document().expect('expected a Bson::Document');
let inner_doc_ref = value.as_document()?;

conditionally:

if let Bson::Document(ref inner_doc) = value {
  generate_schema_from_doc(inner_doc)
}

hope that makes sense!

from bson-rust.

hi! thank you so much for your help! I think doing something like the pattern matching you are describing will work. I am doing something like that at another point anyways o/

from bson-rust.