identify an item in json and update key and value in it - json

Question

my input json is given below , i want select if "Name": "bot-block" then update it's ​"Action": to "Block": {} from "Allow": {},i performed this this using select command but it filters my json and only returns the item with .Name=bot-block,i want updation in json not filtering .this is my current command jq '.[] | select(.Name=="bot-block") | .Action |= . + { "Block" : {} } ' input.json
[
{
"Name": "searchblock",
"Priority": 3,
"Action": {
"Block": {}
},
"VisibilityConfig": {
"SampledRequestsEnabled": true,
"CloudWatchMetricsEnabled": true,
"MetricName": "searchblock"
}
},
{
"Name": "bot-block",
"Priority": 4,
"Action": {
"Allow": {}
},
"VisibilityConfig": {
"SampledRequestsEnabled": true,
"CloudWatchMetricsEnabled": true,
"MetricName": "user-agent"
}
}
]
expected output
[
{
"Name": "searchblock",
"Priority": 3,
"Action": {
"Block": {}
},
"VisibilityConfig": {
"SampledRequestsEnabled": true,
"CloudWatchMetricsEnabled": true,
"MetricName": "searchblock"
}
},
{
"Name": "bot-block",
"Priority": 4,
"Action": {
"Block": {}
},
"VisibilityConfig": {
"SampledRequestsEnabled": true,
"CloudWatchMetricsEnabled": true,
"MetricName": "user-agent"
}
}
]

Answer 1

You can directly "assign" to the Action element of the selected array item. |= only affects the selected item, but the output of the filter is still the entire input.
jq 'map(select(.Name=="bot-block").Action |= {Block: {}})' input.json

Answer 2

Super close! It's just a precedence issue.
.[] | select(.Name=="bot-block") | .Action |= . + { "Block" : {} }
should be
( .[] | select(.Name=="bot-block") | .Action ) |= . + { "Block" : {} }
because |= has lower precedence than |.
jqplay
Think of foo | bar |= baz has modifying foo | bar but returning foo. As such, the original snippet returns the modified .[] | select(.Name=="bot-block"), while the fixed version returns the modified ..