# How to Use Conditional Statements In Fluentd
Conditional statements can be seamlessly integrated into Fluentd's `record_transformer` plugin. Here’s how you can do it:
```text
[label /etc/fluent/fluentd.conf]
@type record_transformer
enable_ruby true
is_successful ${record["status"] == 200 ? "true" : "false"}
```
In this example, the `record_transformer` plugin is employed to add an `is_successful` field to the log records. The value of this field is determined by a ternary operator (a concise conditional statement). It sets `is_successful` to "true" if the `status` field equals 200, and "false" otherwise.
Consider the following dummy log source:
```text
[label /etc/fluent/fluentd.conf]
@type dummy
dummy '{"timestamp":"2024-01-27T08:33:17","severity":"ERROR"}'
format json
tag mylogs
```
You can apply a conditional statement to assess the contents of the `severity` field as follows:
```text
[label /etc/fluent/fluentd.conf]
...
@type record_transformer
enable_ruby true
has_error ${record["severity"] == "ERROR" ? "true" : "false"}
@type stdout
```
In this filter directive, the `has_error` field will be dynamically populated based on the conditional statement. If the `severity` field contains "ERROR", `has_error` is set to `true`, and `false` otherwise.
When Fluentd is executed, the logs will be augmented with the `has_error` field, reflecting the result of the conditional check:
```text
[output]
2024-01-29 05:26:50.076341943 +0000 mylogs: {"timestamp":"2024-01-27T08:33:17","severity":"ERROR","has_error":"true"}
```
In cases where the `severity` is anything other than "ERROR", the `has_error` field would be set to `false`:
```text
[output]
2024-01-29 05:26:50.076341943 +0000 mylogs: {"timestamp":"2024-01-27T08:33:17","severity":"INFO","has_error":"false"}
```
For more in-depth knowledge and various techniques on Fluentd, including conditional processing of log data, explore our comprehensive guide [on collecting, processing, and shipping log data with Fluentd](https://betterstack.com/community/guides/logging/fluentd-explained/).
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