User selected values from JSON - sql

Question

When a user fills out a form in a mobile application a json is created. I load this json into a postgres database and wanting to pull is apart and select the inputs that the user has selected.
I find this hard to explain you really need to see the json and the expected results. The json looks like this...
{
"iso_created_at":"2019-06-25T14:50:59+10:00",
"form_fields":[
{
"field_type":"DateAndTime",
"mandatory":false,
"form_order":0,
"editable":true,
"visibility":"public",
"label":"Time & Date Select",
"value":"2019-06-25T14:50:00+10:00",
"key":"f_10139_64_14",
"field_visibility":"public",
"data":{
"default_to_current":true
},
"id":89066
},
{
"field_type":"Image",
"mandatory":false,
"form_order":6,
"editable":true,
"visibility":"public",
"label":"Photos",
"value":[
],
"key":"f_10139_1_8",
"field_visibility":"public",
"data":{
},
"id":67682
},
{
"field_type":"DropDown",
"mandatory":true,
"form_order":2,
"editable":true,
"visibility":"public",
"label":"Customer ID",
"value":"f_10139_35_13_35_1",
"key":"f_10139_35_13",
"field_visibility":"public",
"data":{
"options":[
{
"is_default":false,
"display_order":0,
"enabled":true,
"value":"f_10139_35_13_35_1",
"label":"27"
}
],
"multi_select":false
},
"id":86039
},
{
"field_type":"CheckBox",
"mandatory":true,
"form_order":3,
"editable":true,
"visibility":"public",
"label":"Measure",
"value":[
"f_7422_10_7_10_1",
"f_7422_10_7_10_2"
],
"key":"f_10139_1_5",
"field_visibility":"public",
"data":{
"options":[
{
"is_default":true,
"display_order":0,
"enabled":true,
"value":"f_7422_10_7_10_1",
"label":"Kg"
},
{
"is_default":true,
"display_order":0,
"enabled":true,
"value":"f_7422_10_7_10_2",
"label":"Mm"
}
],
"multi_select":true
},
"id":67679
},
{
"field_type":"ShortTextBox",
"mandatory":true,
"form_order":4,
"editable":true,
"visibility":"public",
"label":"Qty",
"value":"1000",
"key":"f_10139_9_9",
"field_visibility":"public",
"data":{
},
"id":85776
}
],
"address":"Latitude: -37.811812 Longitude: 144.971745",
"shape_id":6456,
"category_id":75673,
"id":345,
"account_id":778
}
Can anyone help me?
Expected results:
account_id | report_id | field_label | field_value
------------------------------------------------------------------------
778 | 345 | Time & Date Select | 2019-06-25T14:50:00+10:00
778 | 345 | Photos | []
778 | 345 | Customer ID | 27
778 | 345 | Measure | Kg
778 | 345 | Measure | Mm
778 | 345 | Qty | 1000

Answer 1

like say #Amadan, might need to hardcode each field separately instead of making a clever loop ,especially with the fields "Customer ID" "and" "Measure" or any other that requires it.
You can use the json function: json_array_elements_text, here you have a example, you can adjust to your case, i am trying with your case:
select account_id::text,report_id::text,field_label::text,
--case ""Customer ID"" and ""Measure""
case
when field_label::text='"Customer ID"' then ((todo->'data'->'options')->0->'label')::text
when field_label::text='"Measure"' then ((todo->'data'->'options')->0->'label')::text ||',' ||((todo->'data'->'options')->1->'label')::text
else
field_value::text
end as field_value
from
(
select dato->'account_id' as account_id,dato->'id' as report_id,
(json_array_elements_text(dato->'form_fields')::json)->'label' as field_label,
(json_array_elements_text(dato->'form_fields')::json)->'value' as field_value,
(json_array_elements_text(dato->'form_fields')::json) as todo
from (
select '{"iso_created_at": "2019-06-25T14:50:59+10:00", "form_fields": [
{"field_type": "DateAndTime", "mandatory": false, "form_order": 0, "editable": true, "visibility": "public", "label": "Time & Date Select", "value": "2019-06-25T14:50:00+10:00", "key": "f_10139_64_14", "field_visibility": "public", "data":
{"default_to_current": true}, "id": 89066},
{"field_type": "Image", "mandatory": false, "form_order": 6, "editable": true, "visibility": "public", "label": "Photos", "value": [], "key": "f_10139_1_8", "field_visibility": "public", "data": {}, "id": 67682},
{"field_type": "DropDown", "mandatory": true, "form_order": 2, "editable": true, "visibility": "public", "label": "Customer ID", "value": "f_10139_35_13_35_1", "key": "f_10139_35_13", "field_visibility": "public", "data": {"options": [{"is_default": false, "display_order": 0, "enabled": true, "value": "f_10139_35_13_35_1", "label": "27"}], "multi_select": false}, "id": 86039},
{"field_type": "CheckBox", "mandatory": true, "form_order": 3, "editable": true, "visibility": "public", "label": "Measure", "value": ["f_7422_10_7_10_1","f_7422_10_7_10_2"], "key": "f_10139_1_5", "field_visibility": "public", "data": {"options": [{"is_default": true, "display_order": 0, "enabled": true, "value": "f_7422_10_7_10_1", "label": "Kg"},{"is_default": true, "display_order": 0, "enabled": true, "value": "f_7422_10_7_10_2", "label": "Mm"}], "multi_select": true}, "id": 67679},
{"field_type": "ShortTextBox", "mandatory": true, "form_order": 4, "editable": true, "visibility": "public", "label": "Qty", "value": "1000", "key": "f_10139_9_9", "field_visibility": "public", "data": {}, "id": 85776}
], "address": "Latitude: -37.811812 Longitude: 144.971745", "shape_id": 6456, "category_id": 75673, "id": 345, "account_id": 778}'::json as dato) as dat
) dat2
and i get this result, similar to you:
take this example and ajust to you
regards

Answer 2

You need to unnest the values in form_fields and then pick the label and the value from that JSON object:
select fd.account_id,
fd.report_id,
ff.field ->> 'label' as field_label,
ff.field ->> 'value' as field_value
from form_data fd
left join jsonb_array_elements(data -> 'form_fields') as ff(field) on true;
The left join is needed to still see the row from form_data even if no form_fields is available in the main JSON column.
The above assumes a table form_data with the columns account_id, report_id and data (which contains the JSON)
Online example: https://rextester.com/RNIBSB94484