how to access json array in Jobject in couchbase? (SELECT query) - couchbase

Question

This is my Json. I have props.bom_concrete_type.id and i need get "desc" What kind of query need?? Help me
[
{
"create_date": "2017-06-07T09:35:12.2391092+08:00",
"id": "optional_dictionary",
"model": "optional_dictionary",
"props": {
"bom_concrete_type": [
{
"desc": "Shotcrete",
"id": "1",
"shortname": null
},
{
"desc": "Concrete",
"id": "2",
"shortname": null
}
],
"bom_production_type": [
{
"desc": "Underground",
"id": "1",
"shortname": null
},
{
"desc": "Surface",
"id": "2",
"shortname": null
},
{
"desc": "TKAJV",
"id": "3",
"shortname": null
}
],
"mixorder_comment": [
{
"desc": "No order",
"id": "1",
"shortname": null
},
{
"desc": "Client canceled",
"id": "2",
"shortname": null
},
{
"desc": "Batch plant canceled",
"id": "3",
"shortname": null
},
{
"desc": "Re-schedule/Requester cancelled",
"id": "4",
"shortname": null
},
{
"desc": "Batch plant shutdown",
"id": "5",
"shortname": null
},
{
"desc": "Client shutdown",
"id": "6",
"shortname": null
},
{
"desc": "Weather Condition",
"id": "7",
"shortname": null
},
{
"desc": "Client equipment",
"id": "8",
"shortname": null
},
{
"desc": "Batch plant equipment",
"id": "9",
"shortname": null
},
{
"desc": "Incident/Accident",
"id": "10",
"shortname": null
},
{
"desc": "HSE Issue",
"id": "11",
"shortname": null
},
{
"desc": "Client slow production",
"id": "12",
"shortname": null
},
{
"desc": "Time conflict between requests",
"id": "13",
"shortname": null
},
{
"desc": "Normal operation",
"id": "14",
"shortname": null
},
{
"desc": "Slickline or underground maintenance by Client(Mining)",
"id": "15",
"shortname": null
}
]
},
"version": null
}
]

Answer 1

For this sort of query you need to use one of the array operators (https://developer.couchbase.com/documentation/server/4.6/n1ql/n1ql-language-reference/collectionops.html).
I entered your document above into a bucket I called "default". This query will give you the 'desc' field (which needs to be quoted in back-ticks since it is a reserved word, "order by...desc").
select first e.`desc`
for e in props.bom_concrete_type when e.id = "1" end as `desc`
from default;
The query result is:
[
{
"desc": "Shotcrete"
}
]
If you just want the bare value, you can use this query:
select raw first e.`desc`
for e in props.bom_concrete_type when e.id = "1" end
from default;
and the results are:
[
"Shotcrete"
]