querydsl-scala/src/main/scala/com/mysema/query/scala/Expressions.scala

@@ -70,7 +70,9 @@ trait SimpleExpression[T] extends Expression[T]{
 
   def notIn(right: CollectionExpression[T,_]) = in(right).not;
 
-  def not[M <: SimpleExpression[T]](f: (M) => BooleanExpression): BooleanExpression = f(this.asInstanceOf[M]).not();
+  def is[M <: SimpleExpression[T]](f: M => BooleanExpression): BooleanExpression = if (f == null) isNull() else f(this.asInstanceOf[M]);
+  
+  def not[M <: SimpleExpression[T]](f: M => BooleanExpression): BooleanExpression = f(this.asInstanceOf[M]).not();
   
 }
 

querydsl-scala/src/main/scala/com/mysema/query/scala/Matchers.scala

@@ -4,7 +4,9 @@ import com.mysema.query.types._
 
 object Matchers {
     
-//  def in[T](values: T*) = (expr: SimpleExpression[T]) => expr.in(values);  
+  def in[T](values: T*) = (expr: SimpleExpression[T]) => expr.in(values:_*);  
+  
+  def not(v: Void) = (expr: SimpleExpression[_]) => expr.isNotNull();
     
   // map
   

querydsl-scala/src/test/scala/com/mysema/query/scala/ExpressionTest.scala

@@ -14,6 +14,18 @@ class ExpressionTest {
     Assert.assertEquals(expected, actual.toString);
   }  
     
+  @Test
+  def Is_Not_Null {
+    assertEquals("person.other is not null", person.other isNotNull);
+    assertEquals("person.other is not null", person.other is not(null) );   
+  }
+  
+  @Test
+  def Is_Null {
+    assertEquals("person.other is null", person.other isNull);  
+    assertEquals("person.other is null", person.other is null );  
+  }
+  
   @Test
   def Long_Path {
     assertEquals("person.other.firstName = Ben", person.other.firstName eq "Ben");
@@ -98,7 +110,7 @@ class ExpressionTest {
 
   @Test
   def String_Or_With_Operators {
-    val orClause = (person.firstName like "An%") or (person.firstName like "Be%");
+    val orClause = (person.firstName like "An%") || (person.firstName like "Be%");
     assertEquals("person.firstName like An% || person.firstName like Be%", orClause);
   }