Memo Posts - Answer Overflow

Memo

•Created by Memo on 10/16/2024 in #questions

Basic vertex querying does not work in Amazon Neptune but it works with local Gremlin Server

      const fankode : any = await this.gremlinService.readClientSource
        .V( profileId )
        .hasLabel( 'FAN' )
        .next();

      const fankode : any = await this.gremlinService.readClientSource
        .V( profileId )
        .hasLabel( 'FAN' )
        .next();

When I try to fetch vertex with properties like this , or with elementMap() and valueMap(true), It does not work, it just fetches empty object. I can only query properties of a vertex like this in Amazon neptune

      this.gremlinService.readClientSource
        .V( profileId )
        .hasLabel( 'FAN' )
        .properties()
        .toList(),

      this.gremlinService.readClientSource
        .V( profileId )
        .hasLabel( 'FAN' )
        .properties()
        .toList(),

but then I would need two queries for basic fetching which I don't want due to performance reasons. Can anyone give me hand here? Thanks

9 replies

ATApache TinkerPop

•Created by Memo on 8/27/2024 in #questions

Query works when executed in console but not in javascript

const combinedQuery = gremlin.V(profileId)
      .project('following', 'follows')
      .by(
        __.inE('FOLLOWS').outV().dedup().id().fold()
      )
      .by(
        __.outE('FOLLOWS').inV().dedup().id().fold()
      )




    const followingResult = await combinedQuery.next();

    const followsResult = await combinedQuery.next();

    this.logger.debug( `Serving: ${profileId} result: ${JSON.stringify( followingResult )} ` );
64507  -   DEBUG [FetchRelationshipsService] Serving: a28beebb-6724-4012-917f-f7b90730dad3 result: {"value":{},"done":false} 
'

const combinedQuery = gremlin.V(profileId)
      .project('following', 'follows')
      .by(
        __.inE('FOLLOWS').outV().dedup().id().fold()
      )
      .by(
        __.outE('FOLLOWS').inV().dedup().id().fold()
      )




    const followingResult = await combinedQuery.next();

    const followsResult = await combinedQuery.next();

    this.logger.debug( `Serving: ${profileId} result: ${JSON.stringify( followingResult )} ` );
64507  -   DEBUG [FetchRelationshipsService] Serving: a28beebb-6724-4012-917f-f7b90730dad3 result: {"value":{},"done":false} 
'

I get the logged output but when i run through console It works correctly :

{
  "following": [
    "c64a82c1-bae0-4380-a979-fc68d6a3a646",
    "5f8cf1e3-cb3b-46b9-b2c1-6836ac13b06d"
  ],
  "follows": [
    "299eaaa9-8d1e-440e-b6d7-f82dd93dc1d9",
    "5f8cf1e3-cb3b-46b9-b2c1-6836ac13b06d",
    "c64a82c1-bae0-4380-a979-fc68d6a3a646"
  ]
}

{
  "following": [
    "c64a82c1-bae0-4380-a979-fc68d6a3a646",
    "5f8cf1e3-cb3b-46b9-b2c1-6836ac13b06d"
  ],
  "follows": [
    "299eaaa9-8d1e-440e-b6d7-f82dd93dc1d9",
    "5f8cf1e3-cb3b-46b9-b2c1-6836ac13b06d",
    "c64a82c1-bae0-4380-a979-fc68d6a3a646"
  ]
}

What is wrong, why i cant have the query result correctly in js? Thanks

3 replies

Gaming

Programming