Couchbase iterate on properties and get value - couchbase

Question

I have a couchbase document like :
{
"data": {
"author1": {
"title": [
"1",
"2"
]
},
"author2": {
"title": [
"3",
"4"
]
}
}
}
And I would like to get with a N1QL request :
1
2
3
4
How is it possible ?

Answer 1

This might work. It assumes that title contains the values you want.
select VALUE ARRAY_FLATTEN(OBJECT_VALUES(OBJECT_UNWRAP(b))[*].title,1)
from books b
OBJECT_UNWRAP gets rid of the data and unwraps to peel away a layer.
OBJECT_VALUES then returns the values of the individual fields (whatever they are: author1, authorA, author-123)
The [*].title syntax returns every title field in the resulting array
ARRAY_FLATTEN combines the arrays
Finally, use VALUE to get the raw values.
I am NOT claiming this is the best approach, but it seems to work okay with the small sample data set (of 2 docs) that I created based on your question.

Answer 2

SELECT ARRAY_FLATTEN(ARRAY v.title FOR n:v IN b.data END,1) AS title
FROM books b;
OR
SELECT ARRAY_FLATTEN(OBJECT_VALUES(b.data)[*].title,1) AS title
FROM books b;
If need across the documents
WITH books AS ([ { "data": { "author1": { "title": [ "1", "2" ] }, "author2": { "title": [ "3", "4" ] } } },
{ "data": { "author1": { "title": [ "1", "5" ] }, "author2": { "title": [ "6", "1" ] } } }
])
SELECT DISTINCT RAW t
FROM books AS b
UNNEST ARRAY_FLATTEN(ARRAY v.title FOR n:v IN b.data END,1) AS t;
FOR n:v IN b.data
Looping construct
If b.data is OBJECT n holds field name, v holds value
If b.data is ARRAY n holds position, v holds value