# Using Ruby to count the number of fields in a message, then apply CSV depending on the count?

**URL:** <https://discuss.elastic.co/t/using-ruby-to-count-the-number-of-fields-in-a-message-then-apply-csv-depending-on-the-count/177880>\
**Category:** Logstash\
**Created:** [April 22, 2019, 4:26pm UTC](https://discuss.elastic.co/t/using-ruby-to-count-the-number-of-fields-in-a-message-then-apply-csv-depending-on-the-count/177880 "2019-04-22T16:26:14Z")\
**Posts on this page:** 1\
**Showing post:** 2

<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:** [April 22, 2019, 4:48pm UTC](https://discuss.elastic.co/t/using-ruby-to-count-the-number-of-fields-in-a-message-then-apply-csv-depending-on-the-count/177880/2 "2019-04-22T16:48:53Z")

</div>

You can count the fields using ruby

```
ruby { code => 'event.set("[@metadata][fields]", 1 + event.get("message").count(","))' }
if [@metadata][fields] == 73 {
     csv { ... }
} else {
     csv { ... }
}
```

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_[View the full topic](https://discuss.elastic.co/t/using-ruby-to-count-the-number-of-fields-in-a-message-then-apply-csv-depending-on-the-count/177880)._