Convert vertex IDs to vertices in Gremlin

ids2vertices.groovy

// If you use an external search engine to return a list of vertex IDs, 
// a common pattern in Gremlin for starting with Vertex IDs has been to 
// convert the IDs to vertices and use the IdentityPipe to start the pipeline...
// See IdentityPipe https://github.com/tinkerpop/gremlin/wiki/Gremlin-Steps

start = [1,2,3,4].collect{ g.v(it) }
start._().filter{it.isActive}

// ...or as a one liner...

[1,2,3,4].collect{ g.v(it) }._().filter{it.isActive}

// Now this is what g.v(ids) is doing under the hood...
// https://github.com/tinkerpop/gremlin/blob/master/gremlin-groovy/src/main/groovy/com/tinkerpop/gremlin/groovy/loaders/GraphLoader.groovy#L48

g.v(ids).filter{it.isActive} // easiest way now