# Access Plugin variable inside logstash ruby filter

**URL:** <https://discuss.elastic.co/t/access-plugin-variable-inside-logstash-ruby-filter/173196>\
**Category:** Logstash\
**Created:** [March 20, 2019, 5:24pm UTC](https://discuss.elastic.co/t/access-plugin-variable-inside-logstash-ruby-filter/173196 "2019-03-20T17:24:01Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Makra](https://avatars.discourse-cdn.com/v4/letter/m/8491ac/32.png) [@Makra](https://discuss.elastic.co/u/Makra)\
**Post date:** [March 20, 2019, 5:24pm UTC](https://discuss.elastic.co/t/access-plugin-variable-inside-logstash-ruby-filter/173196/1 "2019-03-20T17:24:01Z")

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Hi  
I want to access plugin variable inside ruby filter. For example, the logstash CSV plugin makes use of variable [@columns](https://github.com/logstash-plugins/logstash-filter-csv/blob/master/lib/logstash/filters/csv.rb).

Is it possible to access the variable inside ruby filter ? I tried with using the variable inside ruby filter like:

```auto
 ruby {

                code => "
                           require 'digest/md5';
                           user_name=@columns[0];
                           ...
                           ...
                "
         }

```

But that results in ruby exception.

---

<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 20, 2019, 6:39pm UTC](https://discuss.elastic.co/t/access-plugin-variable-inside-logstash-ruby-filter/173196/2 "2019-03-20T18:39:41Z")

</div>

> [@Makra](#):
>
> Is it possible to access the variable inside ruby filter ?

No, the variables in a csv filter are not in scope inside a ruby filter.

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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 17, 2019, 6:39pm UTC](https://discuss.elastic.co/t/access-plugin-variable-inside-logstash-ruby-filter/173196/3 "2019-04-17T18:39:44Z")

</div>

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