(refs #341) Implement a method to get the session.

src/main/scala/servlet/TransactionFilter.scala

@@ -37,4 +37,8 @@ object Database {
     slick.jdbc.JdbcBackend.Database.forURL(context.getInitParameter("db.url"),
         context.getInitParameter("db.user"),
         context.getInitParameter("db.password"))
+
+  def getSession(req: ServletRequest): slick.jdbc.JdbcBackend#Session =
+    req.getAttribute(Keys.Request.DBSession).asInstanceOf[slick.jdbc.JdbcBackend#Session]
+
 }

src/main/scala/util/Implicits.scala

@@ -2,6 +2,8 @@ package util
 
 import scala.util.matching.Regex
 import scala.util.control.Exception._
+import slick.jdbc.JdbcBackend
+import servlet.Database
 import javax.servlet.http.{HttpSession, HttpServletRequest}
 
 /**
@@ -9,6 +11,9 @@ import javax.servlet.http.{HttpSession, HttpServletRequest}
  */
 object Implicits {
 
+  // Convert to slick session.
+  implicit def request2Session(implicit request: HttpServletRequest): JdbcBackend#Session = Database.getSession(request)
+
   implicit class RichSeq[A](seq: Seq[A]) {
 
     def splitWith(condition: (A, A) => Boolean): Seq[Seq[A]] = split(seq)(condition)