BSONReader specialized for BSONDocument
Attributes
- Companion:
- object
- Graph
- Supertypes
- Known subtypes
- trait BSONDocumentHandler[T]object Handler.type
- Self type
Members list
Value members
Abstract methods
Tries to produce an instance of T from the document.
Tries to produce an instance of T from the document.
import scala.util.Try
import reactivemongo.api.bson.{ BSONDocument, BSONDocumentReader }
def fromBSON[T](document: BSONDocument)(
implicit r: BSONDocumentReader[T]): Try[T] = r.readTry(document)
Attributes
Concrete methods
Prepares a BSONReader that returns the result of applying f
on the result of this reader.
Prepares a BSONReader that returns the result of applying f
on the result of this reader.
import scala.util.Try
import reactivemongo.api.bson.{ BSONReader, BSONValue }
// Try to return an integer + 1,
// from any T that can be read from BSON
// and is a numeric type
def fromBSON[T](bson: BSONValue)(
implicit r: BSONReader[T], n: Numeric[T]): Try[Int] = {
val r2: BSONReader[Int] = r.afterRead { v => n.toInt(v) + 1 }
r2.readTry(bson)
}
Attributes
- f
the function to apply
- Definition Classes
Tries to produce an instance of T from the bson value.
Tries to produce an instance of T from the bson value.
import scala.util.Try
import reactivemongo.api.bson.{ BSONReader, BSONValue }
def fromBSON[T](bson: BSONValue)(implicit r: BSONReader[T]): Try[T] =
r.readTry(bson)
Attributes
Widens this reader for a compatible type U.
Widens this reader for a compatible type U.
import reactivemongo.api.bson.BSONReader
val listReader: BSONReader[List[String]] =
implicitly[BSONReader[List[String]]]
val widenAsSeqReader: BSONReader[Seq[String]] =
listReader.widen[Seq[String]]
// as Seq[String] >: List[String]
Attributes
- U
must be a super-type of
T- Definition Classes
Inherited methods
Prepares a BSONReader that transforms the input BSON value, using the given f function, before passing the transformed BSON value to the current reader.
Prepares a BSONReader that transforms the input BSON value, using the given f function, before passing the transformed BSON value to the current reader.
import reactivemongo.api.bson.{
BSONReader, BSONInteger, BSONNull, BSONString
}
val normalizingReader: BSONReader[Int] =
implicitly[BSONReader[Int]].beforeRead {
case BSONNull => BSONInteger(-1)
case BSONString(s) => BSONInteger(s.size)
// other values are unchanged
}
normalizingReader.readOpt(BSONNull) // Some(-1)
normalizingReader.readTry(BSONString("foo")) // Success(3)
normalizingReader.readOpt(BSONInteger(4)) // unchanged: Some(4)
Attributes
- Inherited from:
- BSONReader
Prepares a BSONReader that transforms the input BSON value, using the given f function, before passing the transformed BSON value to the current reader.
Prepares a BSONReader that transforms the input BSON value, using the given f function, before passing the transformed BSON value to the current reader.
Attributes
- Inherited from:
- BSONReader
Tries to produce an instance of T from the bson value,
returns None if an error occurred.
Tries to produce an instance of T from the bson value,
returns None if an error occurred.
import reactivemongo.api.bson.{ BSONReader, BSONValue }
def fromBSON[T](bson: BSONValue)(implicit r: BSONReader[T]): Option[T] =
r.readOpt(bson)
Attributes
- Inherited from:
- BSONReader
Tries to produce an instance of T from the bson value,
returns the default value if an error occurred.
Tries to produce an instance of T from the bson value,
returns the default value if an error occurred.
import reactivemongo.api.bson.{ BSONReader, BSONValue }
def fromBSON[T](bson: BSONValue, v: T)(implicit r: BSONReader[T]): T =
r.readOrElse(bson, v)
Attributes
- Inherited from:
- BSONReader