9 replies

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

Solution

The gremlin-javascript driver deserializes the elementMap() step into the Map class.

await this.gremlinService.readClientSource.V().elementMap().toList()

await this.gremlinService.readClientSource.V().elementMap().toList()

will return an Array of Maps.

JSON.stringify()

JSON.stringify()

, which NestJS is likely calling for you, doesn't support Maps so you need to convert them into objects using something like

Object.fromEntries()

Object.fromEntries()

Jump to solution

Apache TinkerPop•16mo ago•

9 replies

Memo

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();

      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

Solution

The gremlin-javascript driver deserializes the elementMap() step into the Map class.

await this.gremlinService.readClientSource.V().elementMap().toList()

await this.gremlinService.readClientSource.V().elementMap().toList()

will return an Array of Maps.

JSON.stringify()

JSON.stringify()

, which NestJS is likely calling for you, doesn't support Maps so you need to convert them into objects using something like

Object.fromEntries()

Object.fromEntries()

Jump to solution

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

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