add service for session and global motds

src/main/scala/de/thm/arsnova/services/GlobalMotdService.scala

+package de.thm.arsnova.services
+
+import de.thm.arsnova.models.{GlobalMotd, GlobalMotdId}
+import slick.driver.MySQLDriver.api._
+import scala.concurrent.Future
+
+object GlobalMotdService extends BaseService {
+  def getById(motdId: GlobalMotdId): Future[GlobalMotd] = {
+    globalMotdsTable.filter(_.id === motdId).result.head
+  }
+
+  def getByAudience(audience: String): Future[Seq[GlobalMotd]] = {
+    globalMotdsTable.filter(_.audience === audience).result
+  }
+
+  def create(motd: GlobalMotd): Future[GlobalMotdId] = {
+    globalMotdsTable.returning(globalMotdsTable.map(_.id)) += motd
+  }
+
+  def update(motd: GlobalMotd): Future[Int] = {
+    globalMotdsTable.filter(_.id === motd.id.get).map(m =>
+      (m.audience, m.title, m.text))
+        .update(motd.audience, motd.title, motd.text)
+  }
+
+  def delete(motdId: GlobalMotdId): Future[Int] = {
+    globalMotdsTable.filter(_.id === motdId).delete
+  }
+}

src/main/scala/de/thm/arsnova/services/SessionMotdService.scala

+package de.thm.arsnova.services
+
+import de.thm.arsnova.models.{SessionMotd, SessionMotdId}
+import slick.driver.MySQLDriver.api._
+import scala.concurrent.Future
+
+object SessionMotdService extends BaseService {
+  def getById(motdId: SessionMotdId): Future[SessionMotd] = {
+    globalMotdsTable.filter(_.id === motdId).result.head
+  }
+
+  def getByAudience(audience: String): Future[Seq[SessionMotd]] = {
+    globalMotdsTable.filter(_.audience === audience).result
+  }
+
+  def create(motd: SessionMotd): Future[SessionMotdId] = {
+    globalMotdsTable.returning(globalMotdsTable.map(_.id)) += motd
+  }
+
+  def update(motd: SessionMotd): Future[Int] = {
+    globalMotdsTable.filter(_.id === motd.id.get).map(m =>
+      (m.title, m.text))
+        .update(motd.title, motd.text)
+  }
+
+  def delete(motdId: SessionMotdId): Future[Int] = {
+    globalMotdsTable.filter(_.id === motdId).delete
+  }
+}