# Accessing the value of a dynamic key in an object
**URL:** https://discuss.elastic.co/t/accessing-the-value-of-a-dynamic-key-in-an-object/136012
**Category:** Elasticsearch
**Created:** [June 15, 2018, 12:23am UTC](https://discuss.elastic.co/t/accessing-the-value-of-a-dynamic-key-in-an-object/136012 "2018-06-15T00:23:23Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@pungent](https://discuss.elastic.co/u/pungent)
#### Post date: [June 15, 2018, 12:23am UTC](https://discuss.elastic.co/t/accessing-the-value-of-a-dynamic-key-in-an-object/136012/1 "2018-06-15T00:23:23Z")
Partial mapping of one of my index is as follows:
```
"schools": {
"type": "object",
"dynamic": true,
"properties": {}
}
```
A sample `schools` object of an existing document is:
```
"schools": {
"8291": {
"max": 11,
"min": 11
},
"3546": {
"max": 12,
"min": 10
},
"3896": {
"max": 18,
"min": 12
}
}
```
I have painless script in ES6.2 where dynamically `key` (e.g. 3896) is computed on runtime and passed to script as a parameter
```
"script": {
"params": {
"key": key
},
"source": {
if (doc.containsKey('schools') && doc.schools.containsKey(key)){
String dynamic_key = "schools."+key+".min";
return doc[dynamic_key].value;
} else {
return 0;
}
}
```
So if passed `key` value is 3896, then this should return 12. But I get an error message
`No field found for [schools.3896.min] in mapping with types [myindexname]`
What am I doing wrong? What is the correct way to access a dynamic object where a key name is computed on runtime to fetch its value?
---
### Author:  [@Igor\_Motov](https://discuss.elastic.co/u/Igor_Motov)
#### Post date: [June 18, 2018, 2:26am UTC](https://discuss.elastic.co/t/accessing-the-value-of-a-dynamic-key-in-an-object/136012/2 "2018-06-18T02:26:13Z")
How many different values under "schools" are you going to have in your index?
---
### Author:  [@pungent](https://discuss.elastic.co/u/pungent)
#### Post date: [June 18, 2018, 5:43pm UTC](https://discuss.elastic.co/t/accessing-the-value-of-a-dynamic-key-in-an-object/136012/3 "2018-06-18T17:43:53Z")
@Igor_Motov at a particular time it would be 72, but these kay names changes every week.
---
### Author:  [@Igor\_Motov](https://discuss.elastic.co/u/Igor_Motov)
#### Post date: [June 18, 2018, 5:50pm UTC](https://discuss.elastic.co/t/accessing-the-value-of-a-dynamic-key-in-an-object/136012/4 "2018-06-18T17:50:02Z")
Do you have a daily or weekly indices? If not, increasing the number of dynamic fields is not going to be as sustainable solution.
---
### Author:  [@pungent](https://discuss.elastic.co/u/pungent)
#### Post date: [June 18, 2018, 5:54pm UTC](https://discuss.elastic.co/t/accessing-the-value-of-a-dynamic-key-in-an-object/136012/5 "2018-06-18T17:54:46Z")
No, I don't have weekly/daily indices.
---
### Author:  [@Igor\_Motov](https://discuss.elastic.co/u/Igor_Motov)
#### Post date: [June 18, 2018, 5:56pm UTC](https://discuss.elastic.co/t/accessing-the-value-of-a-dynamic-key-in-an-object/136012/6 "2018-06-18T17:56:13Z")
In this case I would try to avoid having dynamic fields here. What kind of searches are you planning to do with data and what are you trying to achieve by using the script?
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 16, 2018, 5:56pm UTC](https://discuss.elastic.co/t/accessing-the-value-of-a-dynamic-key-in-an-object/136012/7 "2018-07-16T17:56:17Z")
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