# CHecking for existance of a field in Ruby filter?

**URL:** <https://discuss.elastic.co/t/checking-for-existance-of-a-field-in-ruby-filter/80527>\
**Category:** Logstash\
**Created:** [March 29, 2017, 5:55pm UTC](https://discuss.elastic.co/t/checking-for-existance-of-a-field-in-ruby-filter/80527 "2017-03-29T17:55:02Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Grigory\_Shamov](https://avatars.discourse-cdn.com/v4/letter/g/ec9cab/32.png) [@Grigory\_Shamov](https://discuss.elastic.co/u/Grigory_Shamov)\
**Post date:** [March 29, 2017, 5:55pm UTC](https://discuss.elastic.co/t/checking-for-existance-of-a-field-in-ruby-filter/80527/1 "2017-03-29T17:55:02Z")

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Hi, with the new Ruby event.Set/Get syntax, is there a way to check for the variable being defined?

Trying to event.get for a field that does not exist (say, coming from an optional field in grok) makes a Ruby exception.

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<div class="post-metadata">

**Author:** ![artobstrel](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/artobstrel/32/16874_2.png) [@artobstrel](https://discuss.elastic.co/u/artobstrel)\
**Post date:** [March 30, 2017, 9:35am UTC](https://discuss.elastic.co/t/checking-for-existance-of-a-field-in-ruby-filter/80527/2 "2017-03-30T09:35:40Z")

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```
ruby {
	code => "
		if event.get('foo')
			# field 'foo' is existed
		else	
			# field 'foo' is missing
		end	
	"
}
```

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<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 27, 2017, 9:35am UTC](https://discuss.elastic.co/t/checking-for-existance-of-a-field-in-ruby-filter/80527/3 "2017-04-27T09:35:44Z")

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