/** INTERNAL: Get a value from the object and set that in the respective field of the row. */
  @Override
  public void writeFromObjectIntoRowForWhereClause(
      ObjectLevelModifyQuery query, AbstractRecord record) {
    if (isReadOnly()) {
      return;
    }
    Object object;
    if (query.isDeleteObjectQuery()) {
      object = query.getObject();
    } else {
      object = query.getBackupClone();
    }
    Object referenceObject = getRealAttributeValueFromObject(object, query.getSession());

    if (referenceObject == null) {
      writeFromNullObjectIntoRow(record);
    } else {
      if (isForeignKeyRelationship()) {
        Enumeration sourceFields = getForeignKeyFields().elements();
        ClassDescriptor descriptor = query.getSession().getDescriptor(referenceObject.getClass());
        while (sourceFields.hasMoreElements()) {
          DatabaseField sourceKey = (DatabaseField) sourceFields.nextElement();
          String targetQueryKey = (String) getSourceToTargetQueryKeyNames().get(sourceKey);
          DatabaseField targetKeyField =
              descriptor.getObjectBuilder().getFieldForQueryKeyName(targetQueryKey);
          if (targetKeyField == null) {
            throw DescriptorException.variableOneToOneMappingIsNotDefinedProperly(
                this, descriptor, targetQueryKey);
          }
          Object referenceValue =
              descriptor
                  .getObjectBuilder()
                  .extractValueFromObjectForField(
                      referenceObject, targetKeyField, query.getSession());
          record.put(sourceKey, referenceValue);
        }
      }
      if (getTypeField() != null) {
        record.put(getTypeField(), getTypeForImplementor(referenceObject.getClass()));
      }
    }
  }