# Replace field value when equals "-"

**URL:** <https://discuss.elastic.co/t/replace-field-value-when-equals/244453>\
**Category:** Logstash\
**Created:** [August 10, 2020, 7:41pm UTC](https://discuss.elastic.co/t/replace-field-value-when-equals/244453 "2020-08-10T19:41:20Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![gbasic](https://avatars.discourse-cdn.com/v4/letter/g/9de0a6/32.png) [@gbasic](https://discuss.elastic.co/u/gbasic)\
**Post date:** [August 10, 2020, 7:41pm UTC](https://discuss.elastic.co/t/replace-field-value-when-equals/244453/1 "2020-08-10T19:41:20Z")

</div>

Hi I would need to replace a field value (WindDirection,Temp,CityName,WindSpeed,Humidity) to some other value when it equals "-"

This is my data:

```auto
{
    "@timestamp" => 2020-08-10T18:54:08.055Z,
        "Europe" => {
        "DateTime" => {
             "Date" => "09.08.2020",
            "Time" => "15"
        },
               "City" => [
            [0] {
                 "WindDirection" => "NE",
                        "Temp" => "30",
                     "CityName" => "Amsterdam",
                "WindSpeed" => "07",
                       "Humidity" => "46"
            },

```

As you can see I have multiple cities.

Any help would be welcome 🙂

---

<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:** [August 10, 2020, 9:00pm UTC](https://discuss.elastic.co/t/replace-field-value-when-equals/244453/2 "2020-08-10T21:00:33Z")

</div>

If you are still using the ruby code I suggested then you could replace

```
            x[k] = v

```

with something like

```
            x[k] = (v == "-") ? -1 : v
```

---

<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:** [September 7, 2020, 9:00pm UTC](https://discuss.elastic.co/t/replace-field-value-when-equals/244453/3 "2020-09-07T21:00:33Z")

</div>

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