Github user okram commented on a diff in the pull request:
https://github.com/apache/tinkerpop/pull/499#discussion_r88915459
--- Diff:
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/io/graphson/GraphSONSerializersV2d0.java
---
@@ -175,8 +177,30 @@ public PropertyJacksonSerializer() {
public void serialize(final Property property, final JsonGenerator
jsonGenerator, final SerializerProvider serializerProvider)
throws IOException {
jsonGenerator.writeStartObject();
- jsonGenerator.writeObjectField(GraphSONTokens.KEY,
property.key());
+ jsonGenerator.writeStringField(GraphSONTokens.KEY,
property.key());
jsonGenerator.writeObjectField(GraphSONTokens.VALUE,
property.value());
+ if (property.element() instanceof VertexProperty) {
+ VertexProperty vertexProperty = (VertexProperty)
property.element();
+
jsonGenerator.writeObjectFieldStart(GraphSONTokens.ELEMENT);
+ jsonGenerator.writeStringField(GraphSONTokens.VALUETYPE,
"g:VertexProperty");
+
jsonGenerator.writeObjectFieldStart(GraphSONTokens.VALUEPROP);
+ jsonGenerator.writeObjectField(GraphSONTokens.ID,
vertexProperty.id());
+ jsonGenerator.writeStringField(GraphSONTokens.LABEL,
vertexProperty.label());
+ jsonGenerator.writeObjectField(GraphSONTokens.VERTEX,
vertexProperty.element().id());
--- End diff --
Because a `VertexProperty` is attached to a `Vertex` and thus, generalized
`Element` semantics would only cause a chain of JSON unnecessary when `Vertex`
attachement only requires a single ID -- the vertex id.
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