# Eval script inside field
**URL:** https://discuss.elastic.co/t/eval-script-inside-field/269816
**Category:** Elasticsearch
**Tags:** painless
**Created:** [April 11, 2021, 3:29pm UTC](https://discuss.elastic.co/t/eval-script-inside-field/269816 "2021-04-11T15:29:46Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@opak](https://discuss.elastic.co/u/opak)
#### Post date: [April 11, 2021, 3:29pm UTC](https://discuss.elastic.co/t/eval-script-inside-field/269816/1 "2021-04-11T15:29:46Z")
Hello, i have a question how to eval script which can be stored inside a field.
For example, i want to define rules for calculation inside documents. Let's see on this mapping:
index: rules
```auto
{
"properties": {
"price_rule": { "type": "keyword" }
}
}
```
Then i add document:
```auto
curl -X PUT localhost:9200/rules/_doc/1 -d '{"price_rule": " if (params.Age <= 60) { return 20 } else { return 30}"}' -H "Content-Type: application/json"
```
And i want todo a request for search, where i can send para age and see which documents has price\_rule \> 20 as example.
```auto
{
"query": {
"bool" : {
"filter" : {
"script" : {
"script" : {
"source" : "doc['price_rule'].value",
"lang" : "painless",
"params" : {
"Age" : "60"
}
}
}
}
}
}
}
```
How i can eval script inside field and pass params?
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [May 9, 2021, 3:30pm UTC](https://discuss.elastic.co/t/eval-script-inside-field/269816/2 "2021-05-09T15:30:45Z")
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