# How to assign one value to another
**URL:** https://discuss.elastic.co/t/how-to-assign-one-value-to-another/268824
**Category:** Logstash
**Created:** [March 30, 2021, 4:50pm UTC](https://discuss.elastic.co/t/how-to-assign-one-value-to-another/268824 "2021-03-30T16:50:37Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@Pallavibhushan](https://discuss.elastic.co/u/Pallavibhushan)
#### Post date: [March 30, 2021, 4:50pm UTC](https://discuss.elastic.co/t/how-to-assign-one-value-to-another/268824/1 "2021-03-30T16:50:37Z")
Hi ,
I am new to logstash
I have below data in JSON.
"attributes":
[
{ "name": "test1",
"value": "test1\_value" },
{ "name": "test2",
"value": "test2\_value" }
]
I want this data in below format :
"attributes":
[
{ "test1": "test1\_value" },
{ "test2": "test2\_value" }
]
how can we do this in logstash config?
---
### Author:  [@Badger](https://discuss.elastic.co/u/Badger)
#### Post date: [March 30, 2021, 5:16pm UTC](https://discuss.elastic.co/t/how-to-assign-one-value-to-another/268824/2 "2021-03-30T17:16:33Z")
> [@Pallavibhushan](#):
>
> how can we do this in logstash config?
You would do it in a ruby filter. I have not tested it, but you could try this:
```
ruby {
code => '
a = event.get("attributes")
if a.is_a? Array
newA = []
a.each { |x|
newA << { x["name"] => x["value"] }
}
event.set("attributes", newA)
end
'
}
```
---
### Author:  [@Pallavibhushan](https://discuss.elastic.co/u/Pallavibhushan)
#### Post date: [March 30, 2021, 5:58pm UTC](https://discuss.elastic.co/t/how-to-assign-one-value-to-another/268824/3 "2021-03-30T17:58:26Z")
Hi @Badger ,
Thanks for your response.
My input Json is something like this .
{
"field1":value1,
"attributes": [{ "name": "test1", "value": "test\_value1" },{ "name": "test2", "value": "test\_value2" }]
}
and config as below:
input {
file
{
type =\> "json"
codec =\> "json"
path =\> "C:/logstash-7.6.0/input/sample\*.json"
start\_position =\> "beginning"
}
}
filter {
```
mutate {
add_field => {
"sample_Number"=>"%{[field1]}"
"Attributes"=>"%{[attributes]}"
}
}
```
ruby {
code =\> '
a = event.get("Attributes")
if a.is\_a? json
newA = {}
a.each { |x|
newA \<\< { x["name"] =\> x["value"] }
}
event.set("Attributes", newA)
end
'
}
```
prune {
whitelist_names =>["sample_Number","Attributes"]
}
}
```
output {
stdout { }
elasticsearch {
index =\> "test\_index"
hosts =\> ["[http://localhost:9200/](http://localhost:9200/)"]
action =\> "create"
}
}
It is not working as expected.
---
### Author:  [@Badger](https://discuss.elastic.co/u/Badger)
#### Post date: [March 30, 2021, 6:19pm UTC](https://discuss.elastic.co/t/how-to-assign-one-value-to-another/268824/4 "2021-03-30T18:19:51Z")
> [@Pallavibhushan](#):
>
> if a.is\_a? json
This will never be true, so the ruby code will not do anything. Attributes is an Array.
---
### Author:  [@Pallavibhushan](https://discuss.elastic.co/u/Pallavibhushan)
#### Post date: [March 31, 2021, 5:21am UTC](https://discuss.elastic.co/t/how-to-assign-one-value-to-another/268824/5 "2021-03-31T05:21:55Z")
I tried with if a.is\_a? Array. but still same issue
It is passing entire json as it is.
---
### Author:  [@Pallavibhushan](https://discuss.elastic.co/u/Pallavibhushan)
#### Post date: [March 31, 2021, 8:52am UTC](https://discuss.elastic.co/t/how-to-assign-one-value-to-another/268824/6 "2021-03-31T08:52:13Z")
it worked now.
issue was ..
before below code, I was copying data from attribute field to another fields. after removing that it worked
ruby {
code =\> '
```
a = event.get("attributes")
if a.is_a? Array
newA = []
a.each do |x|
newA << { x["name"] => x["value"] }
end
event.set("attributes", newA)
end
'
```
}
Thanks @Badger
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [April 28, 2021, 8:52am UTC](https://discuss.elastic.co/t/how-to-assign-one-value-to-another/268824/7 "2021-04-28T08:52:14Z")
This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.