DOPE-260: add support for ordering by multiple OrderExpressions

Author: jansigi

core/src/main/kotlin/ch/ergon/dope/resolvable/clause/ISelectClause.kt

@@ -45,7 +45,8 @@ interface ISelectOrderByClause<T : ValidType> : ISelectLimitClause<T> {
 }
 
 interface ISelectGroupByClause<T : ValidType> : ISelectOrderByClause<T> {
-    fun orderBy(orderExpression: OrderExpression) = SelectOrderByClause(orderExpression, parentClause = this)
+    fun orderBy(orderExpression: OrderExpression, vararg additionalOrderExpressions: OrderExpression) =
+        SelectOrderByClause(orderExpression, *additionalOrderExpressions, parentClause = this)
     fun orderBy(expression: TypeExpression<out ValidType>, orderByType: OrderByType? = null) = orderBy(OrderExpression(expression, orderByType))
 }
 

core/src/test/kotlin/ch/ergon/dope/resolvable/clause/OrderByClauseTest.kt

@@ -257,6 +257,18 @@ class OrderByClauseTest : ManagerDependentTest {
         assertEquals(expected.toDopeQuery(manager), actual.toDopeQuery(manager))
     }
 
+    @Test
+    fun `should support order by function with multiple orderExpressions`() {
+        val parentClause = someSelectClause()
+        val orderExpression1 = OrderExpression(someStringField())
+        val orderExpression2 = OrderExpression(someNumberField(), ASC)
+        val expected = SelectOrderByClause(orderExpression1, orderExpression2, parentClause = parentClause)
+
+        val actual = parentClause.orderBy(orderExpression1, orderExpression2)
+
+        assertEquals(expected.toDopeQuery(manager), actual.toDopeQuery(manager))
+    }
+
     @Test
     fun `should support order by function with then order by with orderExpression`() {
         val stringField = someStringField()