#413 - ENH: Add ability to clear the OrderBy ... so that a default order by can be set in code and then cleared / overwritten

src/main/java/com/avaje/ebean/OrderBy.java

@@ -198,6 +198,18 @@ public final class OrderBy<T> implements Serializable {
     return list.hashCode();
   }
 
+  /**
+   * Clear the orderBy removing any current order by properties.
+   * <p>
+   * This is intended to be used when some code creates a query with a
+   * 'default' order by clause and some other code may clear the 'default'
+   * order by clause and replace.
+   * </p>
+   */
+  public void clear() {
+    list.clear();
+  }
+
   /**
    * A property and its ascending descending order.
    */

src/test/java/com/avaje/tests/query/orderby/TestOrderByClear.java

@@ -0,0 +1,45 @@
+package com.avaje.tests.query.orderby;
+
+import com.avaje.ebean.BaseTestCase;
+import com.avaje.ebean.Ebean;
+import com.avaje.ebean.OrderBy;
+import com.avaje.ebean.Query;
+import com.avaje.tests.model.basic.Order;
+import com.avaje.tests.model.basic.OrderDetail;
+import com.avaje.tests.model.basic.ResetBasicData;
+import org.avaje.ebeantest.LoggedSqlCollector;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.List;
+
+import static org.junit.Assert.assertTrue;
+
+public class TestOrderByClear extends BaseTestCase {
+
+  @Test
+  public void test() {
+
+    ResetBasicData.reset();
+
+    Query<Order> query = Ebean.find(Order.class)
+        .orderBy().asc("orderDate");
+
+
+    OrderBy<Order> orderBy = query.orderBy();
+    assertTrue(orderBy.containsProperty("orderDate"));
+
+    orderBy.clear();
+    Assert.assertFalse(orderBy.containsProperty("orderDate"));
+
+    orderBy.asc("shipDate");
+    assertTrue(orderBy.containsProperty("shipDate"));
+
+    query.findList();
+    String sql = query.getGeneratedSql();
+
+    assertTrue(sql.contains("order by t0.ship_date"));
+
+  }
+
+}