Fix issue #180

ArangoCollection.updateDocuments() ignoring DocumentUpdateOptions.serializeNull

Author: mpv1989

ChangeLog

@@ -4,6 +4,7 @@ v4.3.8 (2018-xx-xx)
 * changed dependency com.arangodb:velocypack to 1.0.15
  * fixed DateUtil does incorrect conversion of UTC time
 * fixed reconnecting after ArangoDB restarts (issue #186)
+* fixed ArangoCollection.updateDocuments() ignoring DocumentUpdateOptions.serializeNull (issue #180)
 
 v4.3.7 (2018-04-17)
 ---------------------------

src/main/java/com/arangodb/internal/InternalArangoCollection.java

@@ -394,8 +394,10 @@ protected <T> Request updateDocumentsRequest(final Collection<T> values, final D
 request.putQueryParam(ArangoDBConstants.RETURN_NEW, params.getReturnNew());
 request.putQueryParam(ArangoDBConstants.RETURN_OLD, params.getReturnOld());
 request.putHeaderParam(ArangoDBConstants.IF_MATCH, params.getIfMatch());
-request.setBody(
-util().serialize(values, new ArangoSerializer.Options().serializeNullValues(false).stringAsJson(true)));
+request.setBody(util().serialize(values,
+new ArangoSerializer.Options()
+.serializeNullValues(params.getSerializeNull() == null || params.getSerializeNull())
+.stringAsJson(true)));
 return request;
 }