Using the cursor in mongodb-rust sync - mongodb

Question

I took the code from the documentation, but it doesn't work.
pub fn get_countries(&self) {
let cursor = self.countries.find(None, None);
for doc in cursor {
println!("{}", doc?)
}
}
mongodb::sync::Cursor<bson::Document> doesn't implement std::fmt::Display
mongodb::sync::Cursor<bson::Document> cannot be formatted with the default formatter
the ? operator can only be applied to values that implement std::ops::Try
the ? operator cannot be applied to type mongodb::sync::Cursor<bson::Document>
Also the cursor.collect() does not work correctly.
the method collect exists for enum std::result::Result<mongodb::sync::Cursor<bson::Document>, mongodb::error::Error>, but its trait bounds were not satisfied
method cannot be called on std::result::Result<mongodb::sync::Cursor<bson::Document>, mongodb::error::Error> due to unsatisfied trait bounds
I tried using cursor.iter() or cursor.into_iter(), the result was the same
Full code of module
use bson::Document;
use mongodb::{
error::Error,
sync::{ Collection, Database},
};
pub struct Core {
db: Database,
countries: Collection<Document>,
}
impl Core {
pub fn new(db: &Database) -> Core {
Core {
db: db.clone(),
countries: db.collection("countries"),
}
}
pub fn get_country(&self, name: &String) -> Result<Option<Document>, Error> {
self.countries.find_one(bson::doc! { "idc": name }, None)
}
pub fn get_countries(&self) {
let cursor = self.countries.find(None, None);
for doc in cursor {
println!("{}", doc?)
}
}
}

Answer 1

It seems that the doc value is returning a Cursor, so I'm guessing that cursor must be rather the Result<Cursor<T>> type returned by the Collection::find method. https://docs.rs/mongodb/latest/mongodb/sync/struct.Collection.html#method.find
Shouldn't you unwrap (or handle the result with a proper match) your self.countries.find(None, None) result ?
pub fn get_countries(&self) {
let cursor = self.countries.find(None, None).unwrap();
for doc in cursor {
println!("{}", doc?)
}
}

Answer 2

My solution
pub fn get_countries(&self) -> Vec<Document> {
let cursor = self.countries.find(None, None).unwrap();
let mut total: Vec<Document> = Vec::new();
for doc in cursor {
total.push(doc.unwrap());
}
total
}