How Can I group by Gremlin Server (Titan 1.0) Response on Basis of Vertex Id? - graph

Question

I'm trying following query :
g.V(835776).out('Follow').in('WallPost').order().by('PostedTimeLong', decr).range(0,2)
and I'm getting following response :
{
"requestId": "524462bc-5e46-40bf-aafd-64d00351dc87",
"status": {
"message": "",
"code": 200,
"attributes": { }
},
"result": {
"data": [
{
"id": 1745112,
"label": "Post",
"type": "vertex",
"properties": {
"PostImage": [
{
"id": "sd97-11ejc-2wat",
"value": ""
}
],
"PostedByUser": [
{
"id": "sc2j-11ejc-2txh",
"value": "orbitpage#gmail.com"
}
],
"PostedTime": [
{
"id": "scgr-11ejc-2upx",
"value": "2016-06-19T09:17:27.6791521Z"
}
],
"PostMessage": [
{
"id": "sbob-11ejc-2t51",
"value": "Hello #[tag:Urnotice_Profile|835776|1] , #[tag:Abhinav_Srivastava|872488|1] and #[tag:Rituraj_Rathore|839840|1]"
}
],
"PostedTimeLong": [
{
"id": "scuz-11ejc-2vid",
"value": 636019246476802029
}
]
}
},
{
"id": 1745112,
"label": "Post",
"type": "vertex",
"properties": {
"PostImage": [
{
"id": "sd97-11ejc-2wat",
"value": ""
}
],
"PostedByUser": [
{
"id": "sc2j-11ejc-2txh",
"value": "orbitpage#gmail.com"
}
],
"PostedTime": [
{
"id": "scgr-11ejc-2upx",
"value": "2016-06-19T09:17:27.6791521Z"
}
],
"PostMessage": [
{
"id": "sbob-11ejc-2t51",
"value": "Hello #[tag:Urnotice_Profile|835776|1] , #[tag:Abhinav_Srivastava|872488|1] and #[tag:Rituraj_Rathore|839840|1]"
}
],
"PostedTimeLong": [
{
"id": "scuz-11ejc-2vid",
"value": 636019246476802029
}
]
}
}
],
"meta": { }
}
}
since same post is posted on two different Id's it is coming twice in response. I want to group by response on basis of vertex id ( both have same vertex id. or i just want to get one object out of them as both are same only.
I've tried following queries but nothing worked for me :
g.V(835776).out('Follow').in('WallPost').groupBy{it.id}.order().by('PostedTimeLong', decr).range(0,3)
g.V(835776).out('Follow').in('WallPost').group().by(id).order().by('PostedTimeLong', decr).range(0,3)
How can I group by the result on basis of vertex id.

Answer 1

The query
g.V(835776).out('Follow').in('WallPost').group().by(id).order().by('PostedTimeLong', decr).range(0,3)
should work, although order().by() and range() will have no effect. However, I don'tthink you really want to group(), you more likely want to dedup():
g.V(835776).out('Follow').in('WallPost').dedup().order().by('PostedTimeLong', decr).limit(3)