Postgres combine 3 CTEs causes duplicate rows - sql

Question

I'm trying to combine 2 select queries on 2 different tables which have a foreign key in common project_id included with a condition and returned in a single result set with the project_id a json_array called sprints and a json_array called backlog. The output should look something like this.
{
"id": "1920c79d-69d7-4b63-9662-ed5333e9b735",
"name": "Test backend v1",
"backlog_items": [
{
"id": "961b2438-a16b-4f30-83f1-723a05592d68",
"name": "Another User Story 1",
"type": "User Story",
"backlog": true,
"s3_link": null,
"sprint_id": null
},
{
"id": "a2d93017-ab87-4ec2-9589-71f6cebba936",
"name": "New Comment",
"type": "Comment",
"backlog": true,
"s3_link": null,
"sprint_id": null
}
],
"sprints": [
{
"id": "1cd165c7-68f7-4a1d-b018-609989d62ed4",
"name": "Test name 2",
"sprint_items": [
{
"id": "1285825b-1669-40f2-96b8-de02ec80d8bd",
"name": "As an admin I should be able to delete an organization",
"type": "User Story",
"backlog": false,
"s3_link": null,
"sprint_id": "1cd165c7-68f7-4a1d-b018-609989d62ed4"
}
]
},
{
"id": "1cd165c7-68f7-4a1d-b018-609989d62f44",
"name": "Test name 1",
"sprint_items": []
}
]
}
In case there are no backlog items associated with the project_id or sprints with the project_id I want to return an empty list. I figured using Postgres COALESCE function might help in this case but I'm not sure how to use is to achieve what I want.
Sprint table
id | end_date | start_date | project_id | name
--------------------------------------+----------+------------+--------------------------------------+-------------
1cd165c7-68f7-4a1d-b018-609989d62ed4 | | | 1920c79d-69d7-4b63-9662-ed5333e9b735 | Test name 2
Sprint item table
id | sprint_id | name | type | s3_link | backlog | project_id
--------------------------------------+--------------------------------------+--------------------------------------------------------+------------+---------+---------+--------------------------------------
961b2438-a16b-4f30-83f1-723a05592d68 | | Another User Story 1 | User Story | | t | 1920c79d-69d7-4b63-9662-ed5333e9b735
a2d93017-ab87-4ec2-9589-71f6cebba936 | | New Comment | Comment | | t | 1920c79d-69d7-4b63-9662-ed5333e9b735
1285825b-1669-40f2-96b8-de02ec80d8bd | 1cd165c7-68f7-4a1d-b018-609989d62ed4 | As an admin I should be able to delete an organization | User Story | | f | 1920c79d-69d7-4b63-9662-ed5333e9b735
The query I'm using right now which returns multiple duplicates in the result set.
with si as (
select si.id, si.name, si.backlog, si.project_id
from sprint_items si
), s as (
select s.id, s.name, s.project_id, jsonb_agg(to_jsonb(si) - 'project_id') as sprint_items
from sprints s
left join sprint_items si
on si.sprint_id = s.id
group by s.id, s.name, s.project_id
), p as (
select p.id, p.name, jsonb_agg(to_jsonb(s) - 'project_id') as sprints,
jsonb_agg(to_jsonb(case when si.backlog = true then si end) - 'project_id') as backlog_items
from projects p
left join s
on s.project_id = p.id
left join si
on si.project_id = p.id
group by p.id, p.name
)
select to_jsonb(p) from p
where p.id = '1920c79d-69d7-4b63-9662-ed5333e9b735'
Updated
This is what the above query is producing in terms of duplicating the sprint items and sprints
{
"id": "1920c79d-69d7-4b63-9662-ed5333e9b735",
"name": "Test backend v1",
"sprints": [
{
"id": "1cd165c7-68f7-4a1d-b018-609989d62ed4",
"name": "Test name 2",
"sprint_items": [
{
"id": "1285825b-1669-40f2-96b8-de02ec80d8bd",
"name": "As an admin I should be able to delete an organization",
"type": "User Story",
"backlog": false,
"s3_link": null,
"sprint_id": "1cd165c7-68f7-4a1d-b018-609989d62ed4"
}
]
},
{
"id": "1cd165c7-68f7-4a1d-b018-609989d62ed4",
"name": "Test name 2",
"sprint_items": [
{
"id": "1285825b-1669-40f2-96b8-de02ec80d8bd",
"name": "As an admin I should be able to delete an organization",
"type": "User Story",
"backlog": false,
"s3_link": null,
"sprint_id": "1cd165c7-68f7-4a1d-b018-609989d62ed4"
}
]
},
{
"id": "1cd165c7-68f7-4a1d-b018-609989d62ed4",
"name": "Test name 2",
"sprint_items": [
{
"id": "1285825b-1669-40f2-96b8-de02ec80d8bd",
"name": "As an admin I should be able to delete an organization",
"type": "User Story",
"backlog": false,
"s3_link": null,
"sprint_id": "1cd165c7-68f7-4a1d-b018-609989d62ed4"
}
]
},
{
"id": "1cd165c7-68f7-4a1d-b018-609989d62f44",
"name": "Test name 1",
"sprint_items": [
null
]
},
{
"id": "1cd165c7-68f7-4a1d-b018-609989d62f44",
"name": "Test name 1",
"sprint_items": [
null
]
},
{
"id": "1cd165c7-68f7-4a1d-b018-609989d62f44",
"name": "Test name 1",
"sprint_items": [
null
]
}
],
"backlog_items": [
null,
{
"id": "961b2438-a16b-4f30-83f1-723a05592d68",
"name": "Another User Story 1",
"backlog": true
},
{
"id": "a2d93017-ab87-4ec2-9589-71f6cebba936",
"name": "New Comment",
"backlog": true
},
null,
{
"id": "961b2438-a16b-4f30-83f1-723a05592d68",
"name": "Another User Story 1",
"backlog": true
},
{
"id": "a2d93017-ab87-4ec2-9589-71f6cebba936",
"name": "New Comment",
"backlog": true
}
]
}
Any pointers to what functions I should read up would be greatly appreciated.