The scala-mongo-driver has a decent documentation for working with case classes. http://mongodb.github.io/mongo-scala-driver/2.3/getting-started/quick-tour-case-classes/.
In current situation my case class fields are Option[T] values. So the values can be either None or Some(T).The default codec is now serializing 'None' values as null. But I want to exclude the key if its value is None. How can I obtain this behavior? From my research I think we need to write a custom Codec or Codec Provider for the case class instead of the default case class codec.
Scala mongo driver custom codec for case classes
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There is an new macro helper since v2.1.0:
Macros.createCodecProviderIgnoreNonewhere you can define thatNonevalues will be ignored from saving to the DB.