How would I write a query to give me the following results? - orientdb

Question

I have 2 classes.
Activities and Comments.
Activities, is linked to comments.
Comments, has the fields username, comment and created_at
When I execute select from Activities, this is an example of my current results. Below, you will see an example of my desired results (Example 2)
Example 1
{
"#type": "d",
"#rid": "#28:38",
"#version": 10,
"#class": "Activities",
"activity_type_id": 1,
"username": "johnt",
"title": "random new activitie test",
"image": "http://www.someurl.com/images/blah-2.png",
"comments": [
"#24:26",
"#24:27",
"#24:28",
"#24:29",
"#24:30",
"#24:31"
],
"Activity_Properties": {
"comment_count": 0,
"share_count": 0,
"like_count": 0
}
}
my desired results are the following
Example 2
{
"#type": "d",
"#rid": "#28:38",
"#version": 10,
"#class": "Activities",
"activity_type_id": 1,
"username": "ultimaterandomuser",
"title": "random new activitie test",
"image": "http://www.someurl.com/images/blah.png",
"comments": [
{
"username": "randomuser1",
"comment": "randomuser1 comment"
"created_at": "2016-06-23 00:00:00",
},
{
"username": "randomuser2",
"comment": "randomuser2 comment"
"created_at": "2016-06-23 00:00:00",
},
{
"username": "randomuser3",
"comment": "randomuser3 comment"
"created_at": "2016-06-23 00:00:00",
}
],
"Activity_Properties": {
"comment_count": 0,
"share_count": 0,
"like_count": 0,
}
}

Answer 1

I tried your case with this simple dataset:
Output Query 1:
SELECT FROM Activities
{
"result": [
{
"#type": "d",
"#rid": "#12:0",
"#version": 1,
"#class": "Activities",
"activity_type_id": 1,
"username": "ultimaterandomuser",
"title": "random new activitie test",
"image": "http://www.someurl.com/images/blah.png",
"comments": [
"#13:0",
"#13:1",
"#13:2"
],
"Activity_Properties": {
"comment_count": 0,
"share_count": 0,
"like_count": 0
},
"#fieldTypes": "comments=n"
}
],
"notification": "Query executed in 0.01 sec. Returned 1 record(s)"
}
Output Query 2:
SELECT expand(#this.exclude('comments')) FROM (SELECT *, $comments as commentsList FROM Activities
LET $comments = (SELECT expand(#this.exclude('#rid')) FROM (SELECT username, comment, created_at FROM Comments WHERE #rid IN $parent.current.comments)))
{
"result": [
{
"#type": "d",
"#rid": "#12:0",
"#version": 1,
"#class": "Activities",
"activity_type_id": 1,
"username": "ultimaterandomuser",
"title": "random new activitie test",
"image": "http://www.someurl.com/images/blah.png",
"Activity_Properties": {
"comment_count": 0,
"share_count": 0,
"like_count": 0
},
"commentsList": [
{
"#type": "d",
"#version": 0,
"username": "randomuser1",
"comment": "randomuser1 comment",
"created_at": "2016-06-25 03:33:13",
"#fieldTypes": "created_at=t"
},
{
"#type": "d",
"#version": 0,
"username": "randomuser2",
"comment": "randomuser2 comment",
"created_at": "2016-06-25 03:33:13",
"#fieldTypes": "created_at=t"
},
{
"#type": "d",
"#version": 0,
"username": "randomuser3",
"comment": "randomuser3 comment",
"created_at": "2016-06-25 03:33:13",
"#fieldTypes": "created_at=t"
}
],
"#fieldTypes": "commentsList=z"
}
],
"notification": "Query executed in 0.041 sec. Returned 1 record(s)"
}
Hope it helps