FIX: insert in batch OneToOne relationship (#1609)

src/test/java/org/tests/batchinsert/TestBatchInsertOneToOne.java

@@ -0,0 +1,40 @@
+package org.tests.batchinsert;
+
+import io.ebean.Ebean;
+import io.ebean.annotation.PersistBatch;
+import io.ebean.annotation.Transactional;
+import org.junit.Test;
+import org.tests.batchinsert.o2o.MeterAddressData;
+import org.tests.batchinsert.o2o.MeterContractData;
+import org.tests.batchinsert.o2o.MeterSpecialNeedsClient;
+import org.tests.batchinsert.o2o.MeterSpecialNeedsContact;
+import org.tests.batchinsert.o2o.MeterVersion;
+
+public class TestBatchInsertOneToOne {
+  private MeterVersion build(){
+    MeterAddressData addressData = new MeterAddressData();
+    addressData.setStreet("street");
+    MeterContractData contractData = new MeterContractData();
+
+    MeterSpecialNeedsClient specialNeedsClient = new MeterSpecialNeedsClient();
+    contractData.setSpecialNeedsClient(specialNeedsClient);
+
+    MeterSpecialNeedsContact contact1 = new MeterSpecialNeedsContact();
+
+    specialNeedsClient.setPrimary(contact1);
+
+    MeterVersion meterVersion = new MeterVersion();
+    meterVersion.setAddressData(addressData);
+    meterVersion.setContractData(contractData);
+
+    return meterVersion;
+  }
+
+  @Transactional(batch = PersistBatch.ALL, batchOnCascade = PersistBatch.ALL, batchSize = 10)
+  @Test
+  public void test() {
+    MeterVersion meterVersion = build();
+
+    Ebean.save(meterVersion);
+  }
+}