Move Implicit && to model package object.

src/main/scala/model/package.scala

@@ -1,5 +1,6 @@
 package object model {
-  import scala.slick.lifted.MappedTypeMapper
+  import scala.slick.driver.BasicDriver.Implicit._
+  import scala.slick.lifted.{Column, MappedTypeMapper}
 
   // java.util.Date TypeMapper
   implicit val dateTypeMapper = MappedTypeMapper.base[java.util.Date, java.sql.Timestamp](
@@ -7,6 +8,10 @@ package object model {
       t => new java.util.Date(t.getTime)
   )
 
+  implicit class RichColumn(c1: Column[Boolean]){
+    def &&(c2: => Column[Boolean], guard: => Boolean): Column[Boolean] = if(guard) c1 && c2 else c1
+  }
+
   /**
    * Returns system date.
    */