mongo.get.last.err: Retrieve an server error code from a mongo connection object
In jonkatz2/rmongodb: R-MongoDB driver

Description Usage Arguments Value See Also Examples

Retrieve an server error record from a the MongoDB server. This describes the last error that occurs while accessing the give database. While this function retrieves an error record in the form of a mongo.bson record, it also sets the values returned by mongo.get.server.err() and mongo.get.server.err.string(). You may find it more convenient using those after calling mongo.get.last.err() rather than unpacking the returned mongo.bson object.

1	mongo.get.last.err(mongo, db)

`mongo`	(mongo) a mongo connection object.
`db`	(string) The name of the database for which to get the error status.

NULL if no error was reported; otherwise,

(mongo.bson) This BSON object has the form err : "error message string", code : error code integer

mongo.get.server.err,
mongo.get.server.err.string,
mongo.get.prev.err
mongo.

mongo <- mongo.create()
if (mongo.is.connected(mongo)) {

    # try adding a duplicate record when index doesn't allow this

    db <- "test"
    ns <- "test.people"
    mongo.index.create(mongo, ns, '{"name":1}', mongo.index.unique)

    buf <- mongo.bson.buffer.create()
    mongo.bson.buffer.append(buf, "name", "John")
    mongo.bson.buffer.append(buf, "age", 22L)
    b <- mongo.bson.from.buffer(buf)
    mongo.insert(mongo, ns, b);

    buf <- mongo.bson.buffer.create()
    mongo.bson.buffer.append(buf, "name", "John")
    mongo.bson.buffer.append(buf, "age", 27L)
    b <- mongo.bson.from.buffer(buf)
    mongo.insert(mongo, ns, b);

    err <- mongo.get.last.err(mongo, db)
    print(mongo.get.server.err(mongo))
    print(mongo.get.server.err.string(mongo))
}