JSON_MODIFY append $..... already exist instead update,duplicating value - sql

Question

I am trying to add or update using JSON_MODIFY append $.roles in json object roles properties.
But it's seem like instead of updating existing object adding new object.how to solve this not got solution yet.
here is query:
SELECT json_modify(fs1.[Schema], 'append $.roles', json_query(
(
SELECT ar1.rolename AS [role],
ar1.[create] AS [permissions.create],
ar1.[read] AS [permissions.read],
ar1.[update] AS [permissions.update],
ar1.[delete] AS [permissions.delete] FOR json path,
without_array_wrapper ))) AS [Schema]
FROM applicationroles ar1
JOIN commonformsschema fs1
ON ar1.schemaid= fs1.schemaid
Schema column input json:
{
"roles": [
{
"role": "Senior Project Manager",
"permissions": {
"create": true,
"read": true,
"update": true,
"delete": true
}
},
{
"role": "Read",
"permissions": {
"create": false,
"read": true,
"update": true,
"delete": true
}
}
]
}
Current Result:
{
"roles": [
{
"role": "Senior Project Manager",
"permissions": {
"create": true,
"read": true,
"update": true,
"delete": true
}
},
{
"role": "Read",
"permissions": {
"create": false,
"read": true,
"update": true,
"delete": true
}
},
{
"role": "Read",
"permissions": {
"create": false,
"read": true,
"update": false,
"delete": false
}
}
]
}
Expected result:
{
"roles": [
{
"role": "Senior Project Manager",
"permissions": {
"create": true,
"read": true,
"update": true,
"delete": true
}
},
{
"role": "Read",
"permissions": {
"create": false,
"read": true,
"update": false,
"delete": false
}
}
]
}
how to solve this?
thanks.

Answer 1

append is only used if you want to add another object to the array.
If you want to modify the existing object, use the array index:
SELECT json_modify(fs1.[Schema], '$.roles[1]', json_query(
(
SELECT ar1.rolename AS [role],
ar1.[create] AS [permissions.create],
ar1.[read] AS [permissions.read],
ar1.[update] AS [permissions.update],
ar1.[delete] AS [permissions.delete]
FOR json path, without_array_wrapper
))
) AS [Schema]
FROM applicationroles ar1
JOIN commonformsschema fs1
ON ar1.schemaid = fs1.schemaid;
If you don't know whether to add or update, and you are checking based on rolename, instead you can query the current value's index, and update that.
This only works on SQL Server 2017
SELECT json_modify(fs1.[Schema],
ISNULL(N'$.roles[' + j.[key] COLLATE Latin1_General_BIN2 + N']', N'append $.roles'), json_query(
(
SELECT ar1.rolename AS [role],
ar1.[create] AS [permissions.create],
ar1.[read] AS [permissions.read],
ar1.[update] AS [permissions.update],
ar1.[delete] AS [permissions.delete]
FOR json path, without_array_wrapper
))
) AS [Schema]
FROM applicationroles ar1
JOIN commonformsschema fs1
ON ar1.schemaid = fs1.schemaid
OUTER APPLY (
SELECT TOP (1) j.[key]
FROM OPENJSON(fs1.[Schema], '$.roles') j
WHERE JSON_VALUE(j.value, '$.rolename') = ar1.rolename
) j;