Update single value in sub sub array in RethinkDB - rethinkdb

Question

We are trying to update a single answer in our sub sub array.
However our query is causing the following error:
{
"deleted": 0 ,
"errors": 1 ,
"first_error": "Inserted value must be an OBJECT (got ARRAY):
[
{
"answers": [
{
"answer": "wassup",
"owner": 12201836
}
],
"question": "Vraag 1?",
"questionId": 0,
"time": "10"
},
{
"answers": [],
"question": "Vraag 2?",
"questionId": 1,
"time": "15"
},
{
"answers": [],
"question": "Vraga 3?",
"questionId": 2,
"time": "20"
}
]" ,
"inserted": 0 ,
"replaced": 0 ,
"skipped": 0 ,
"unchanged": 0
}
Our table structure looks like the following:
Youtube
- Id
- Course
- Unit
- Session
- Number
- Group
- Questions (array)
- Question Id
- Time
- Answers (array)
- Id
- Answer
- Owner
Our query:
r.db('GitSmurf')
.table('youtube')
.update(function (row) {
return row('questions').merge(function (q) {
return r.branch(q('questionId').eq(0), { "answers": q('answers').merge(function(answer) {
return r.branch(answer('owner').eq(12201836), {"answer": "wassup"}, {})} )},{})
})
})
Test content:
{
"completed": [ ],
"course": "swd" ,
"group": "dwa-group-b" ,
"id": "44443377-ed15-4358-a005-f561e7b6a42d" ,
"number": 1 ,
"session": 1 ,
"unit": 1,
"questions": [
{
"answers": [
{
"answer": "hallo" ,
"owner": 12201836
}
] ,
"question": "Vraag 1?" ,
"questionId": 0 ,
"time": "10"
} ,
{
"answers": [ ],
"question": "Vraag 2?" ,
"questionId": 1 ,
"time": "15"
} ,
{
"answers": [ ],
"question": "Vraga 3?" ,
"questionId": 2 ,
"time": "20"
}
] ,
}
Any help is greatly appreciated!

Answer 1

We forgot to return a new object in the update query.
When we added that it worked.
r.db('GitSmurf')
.table('youtube')
.update(function (row) {
return { questions: row('questions').merge(function (q) {
return r.branch(q('questionId'), { "answers": q('answers').merge(function(answer) {
return r.branch(answer('owner').eq(12201836), {"answer": "tom"}, {})
})},{})
})}
})