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https://issues.apache.org/jira/browse/TINKERPOP3-479?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14388687#comment-14388687
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Curtis Allen commented on TINKERPOP3-479:
-----------------------------------------
Sometimes we find it useful to know if a vertex was found or created. When
we've implemented a {{ensure}} function it typically returns a small wrapper
that will provide the vertex and a boolean signifying if the returned vertex
was found or created.
e.g.
{code:java}
public class ElementBucket<E extends
org.apache.tinkerpop.gremlin.structure.Element> {
private final E element;
private final boolean created;
...
}
{code}
Our {{ensure}} method will return a type of {{ElementBucket}} so your client
code will look something like
{code:java}
ElementBucket<Vertex> vertex = GraphTraversalContext.ensure(Constriant.UNIQUE,
"userId", "1234")
if(vertex.isCreated){
// add additional props
}
{code}
It would be nice if there was a way to tell if the {{ensure}} method found or
created the graph element.
> Consider Providing "getOrCreate" Functionality
> ----------------------------------------------
>
> Key: TINKERPOP3-479
> URL: https://issues.apache.org/jira/browse/TINKERPOP3-479
> Project: TinkerPop 3
> Issue Type: Improvement
> Components: structure
> Reporter: stephen mallette
>
> One of the most commonly written functions used is good ol' "getOrCreate"
> where you want to get a {{Vertex}} if it exists or create it with supplied
> properties if it does not. We currently have a "helper" function for this on
> {{ElementHelper}}
> https://github.com/tinkerpop/tinkerpop3/blob/6d0f00865f673cb0739f6f310e1868425f732924/gremlin-core/src/main/java/com/tinkerpop/gremlin/structure/util/ElementHelper.java#L62
> but perhaps it is time to treat this issue as a first class citizen as part
> of the Graph API. I think that some vendors might actually be able to
> optimize this function as well.
> Another aspect of "getOrCreate" is "upsert" as well as options to ensure
> uniqueness. All of these things we've at some point or another built
> variations of outside of TinkerPop for applications, data loading, etc.
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