PostgreSql jsonb field to view - postgresql

Question

I have this kind of jsonb data in one of column named "FORM" in a my table "process" and I want to create view with some data which are inside of row named field I just want name and value form field named array in this jsonb.
here the jsonb:
{
"column": [
{
"row": {
"id": "ebc7afddad474aee8f82930b6dc328fe",
"name": "Details",
"field": [
{
"name": {
"id": "50a5613e97e04cb5b8d32afa8a9975d1",
"label": "name"
},
"value": {
"stringValue": "yhfghg"
}
}
]
}
},
{
"row": {
"id": "5b7471413cbc44c1a39895020bf2ec58",
"name": "leave details",
"field": [
{
"name": {
"id": "bb127e8284c84692aa217539c4312394",
"label": "date"
},
"value": {
"dateValue": 1549065600
}
},
{
"name": {
"id": "33b2c5d1a968481d9d5e386db487de52",
"label": "days",
"options": {
"allowedValues": [
{
"item": "1"
},
{
"item": "2"
},
{
"item": "3"
},
{
"item": "4"
},
{
"item": "5"
}
]
},
"defaultValue": {
"radioButtonValue": "1"
}
},
"value": {
"radioButtonValue": "3"
}
}
]
}
}
]
}
and i want to this kind of jsonb in view data comes from subarray called field inside the object named row......
[
{
"name": {
"id": "50a5613e97e04cb5b8d32afa8a9975d1"
},
"value": {
"stringValue": "yhfghg"
}
},
{
"name": {
"id": "bb127e8284c84692aa217539c4312394"
},
"value": {
"dateValue": 1549065600
}
},
{
"name": {
"id": "33b2c5d1a968481d9d5e386db487de52"
},
"value": {
"radioButtonValue": "3"
}
}
]
How can I do this?

Answer 1

I used jsonb_array_elements twice to expand the two arrays, then used json_build_object to make the result structure and jsonb_agg combine the several rows generated above into a single JSONB array.
I included a row number is the results so I could later apply group by so that results from several "process" rows would not be accidentally combined by the jsonb_agg.
with cols as (select jsonb_array_elements( "FORM" ->'column') as r
,row_number() over () as n from "process" )
,cols2 as (select jsonb_array_elements(r->'row'->'field') as v
,n from cols)
select jsonb_agg(json_build_object('name',v->'id','value',v->'value'))
from cols2 group by n;