- Added ExplainTypes compiler option to explain type errors in more

  detail
- Added a minor level of detection for scala.Nothing and throw a
  IllegalArgumentException if it's picked up due to type inference
  failure (Added to MongoDBObject)

project/build/CasbahProject.scala

@@ -1,7 +1,7 @@
 import sbt._
 
-class CasbahProject(info: ProjectInfo) extends DefaultProject(info) with rsync.RsyncPublishing {
-  override def compileOptions = super.compileOptions ++ Seq(Unchecked, Deprecation)
+class CasbahProject(info: ProjectInfo) extends DefaultProject(info) with rsync.RsyncPublishing with  posterous.Publish {
+  override def compileOptions = super.compileOptions ++ Seq(Unchecked, ExplainTypes, Deprecation)
 
   val scalaTime = "org.scala-tools" % "time" % "2.8.0-0.2-SNAPSHOT"
 

project/plugins/Plugin.scala

@@ -1,7 +1,8 @@
 class Plugins(info: sbt.ProjectInfo) extends sbt.PluginDefinition(info) {
   val codaRepo = "Coda Hale's Repository" at "http://repo.codahale.com/"
   val rsyncSBT = "com.codahale" % "rsync-sbt" % "0.1.0"
-
+  val posterousRepo = "t_repo" at "http://tristanhunt.com:8081/content/groups/public/"
+  val posterous = "net.databinder" % "posterous-sbt" % "0.1.6"
 }
 
 // vim: set ts=2 sw=2 sts=2 et:

src/main/scala/mongodb/MongoDBObject.scala

@@ -60,10 +60,13 @@ trait MongoDBObject extends Map[String, Object] with Logging {
     case value => Some(value)
   }
 
-  def apply[A : Manifest](key: String) = underlying.get(key).asInstanceOf[A]
+  def apply[A <% AnyRef : Manifest](key: String): A = {
+    require(manifest[A] != manifest[scala.Nothing], "Type inference failed; apply() requires an explicit type argument (e.g. dbObject[<ReturnType](\"someKey\") ) to function correctly.")
+    underlying.get(key).asInstanceOf[A]
+  }
 
   /** Lazy utility method to allow typing without conflicting with Map's required get() method and causing ambiguity */
-  def getAs[A](key: String): Option[A] = underlying.get(key) match {
+  def getAs[A <% AnyRef : Manifest](key: String): Option[A] = underlying.get(key) match {
     case null => None
     case value => Some(value.asInstanceOf[A])
   }