Decoding DBObjects 

all decode operations in the-bson produce DecodeResult, defined as

// \/ and NonEmptyList come from scalaz
type DecodeResult[+A] = \/[NonEmptyList[DecodeError], A]

if any decode operation fails, all the errors involved will be reported.

DecodeError has fixed set of subtypes:

• NoSuchField: a field that was expected to be present in an object is not
• WrongType and
• WrongFieldType: both result from casting failures, which means the latter is more likely
• WrongFieldCount: see validateFields in DecodeBson
• CustomError: if you need to report an error that doesn’t fit into one of the above ones, you can use this.