# Remove Subfield using ruby

**URL:** https://discuss.elastic.co/t/remove-subfield-using-ruby/225055
**Category:** Logstash
**Created:** [March 25, 2020, 7:44pm UTC](https://discuss.elastic.co/t/remove-subfield-using-ruby/225055 "2020-03-25T19:44:27Z")
**Posts on this page:** 7
**Page:** 1

<div class="post-metadata">

### Author: ![inhinyera16](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/inhinyera16/32/61625_2.png) [@inhinyera16](https://discuss.elastic.co/u/inhinyera16)
#### Post date: [March 25, 2020, 7:44pm UTC](https://discuss.elastic.co/t/remove-subfield-using-ruby/225055/1 "2020-03-25T19:44:27Z")

</div>

Anyone knows how to remove the attachment.documentcharacteristic field? using logstash ruby.

Here the json data

![image](https://us1.discourse-cdn.com/elastic/original/3X/1/b/1bc926a68aea6ef19b526c7a3de0e40a70aa79ae.png)

---

<div class="post-metadata">

### Author: ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)
#### Post date: [March 25, 2020, 11:20pm UTC](https://discuss.elastic.co/t/remove-subfield-using-ruby/225055/2 "2020-03-25T23:20:09Z")

</div>

Why not use

```
mutate { remove_field => ["[attachment][0][documentCharacteristic]" ] }

```

but if you insist...

```
ruby { code => 'event.remove("[attachment][0][documentCharacteristic]")' }
```

---

<div class="post-metadata">

### Author: ![inhinyera16](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/inhinyera16/32/61625_2.png) [@inhinyera16](https://discuss.elastic.co/u/inhinyera16)
#### Post date: [March 26, 2020, 12:37pm UTC](https://discuss.elastic.co/t/remove-subfield-using-ruby/225055/3 "2020-03-26T12:37:32Z")

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hi thank yo for reply, but i need to remove not only at index 0 but unto all

This is what the schema looks like

```
attachments : [
	{
		field1 : "sasas",
		documentCharacteristic : [
			name:value
		]
	},
	{
		field1 : "asa",
		documentCharacteristic : [
			name:value
		]
	},
	{
		field1 : "fdgee",
		documentCharacteristic : [
			name:value
		]
	}
	.
	.
	.
	.
	.
	.
	etc
]

```

i want it to be like this

```
attachments : [
	{
		field1 : "sasas"
	},
	{
		field1 : "asa"
	},
	{
		field1 : "fdgee"
	}
	.
	.
	.
	etc
]
```

---

<div class="post-metadata">

### Author: ![inhinyera16](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/inhinyera16/32/61625_2.png) [@inhinyera16](https://discuss.elastic.co/u/inhinyera16)
#### Post date: [March 26, 2020, 4:56pm UTC](https://discuss.elastic.co/t/remove-subfield-using-ruby/225055/4 "2020-03-26T16:56:05Z")

</div>

Hi badger thank you, but i tweak a little

```
            ruby { code => '
                    event.get("attachments").each_with_index { |b,index|
                            event.remove("[attachments][#{index}][documentCharacteristic]")
                    }
                    '
            }
```

---

<div class="post-metadata">

### Author: ![Rahul\_Kumar4](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rahul_kumar4/32/67369_2.png) [@Rahul\_Kumar4](https://discuss.elastic.co/u/Rahul_Kumar4)
#### Post date: [March 28, 2020, 11:08am UTC](https://discuss.elastic.co/t/remove-subfield-using-ruby/225055/5 "2020-03-28T11:08:19Z")

</div>

@inhinyera16 Did this work for you? Shouldn't that be `attachments` and not `attachment` and even after that my output does not seem to be correct.

---

<div class="post-metadata">

### Author: ![inhinyera16](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/inhinyera16/32/61625_2.png) [@inhinyera16](https://discuss.elastic.co/u/inhinyera16)
#### Post date: [April 2, 2020, 4:09pm UTC](https://discuss.elastic.co/t/remove-subfield-using-ruby/225055/6 "2020-04-02T16:09:55Z")

</div>

Oh yeah, typo mistake. Already corrected it.

---

<div class="post-metadata">

### Author: ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)
#### Post date: [April 30, 2020, 4:09pm UTC](https://discuss.elastic.co/t/remove-subfield-using-ruby/225055/7 "2020-04-30T16:09:57Z")

</div>

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