---
title: "pushx · RUAL Documentation"
description: "prepend an element to a list, only if the list exists"
canonical: https://docs.rual.nl/block-types/redis/redis_list_pushx
language: en
---

# pushx

This block is part of the [`redis`](https://docs.rual.nl/block-types/redis) group and was last modified in core [`v13.0.7`](https://docs.rual.nl/core-versions/130007).

### Redis Key Selection Required

This block relies on a Redis key to perform its redis releated actions. You must manually select the Redis key you want to use in the flow in the blueprint using the Redis key selector modal. To access the modal, click the white button on the block.

prepend an element to a list, only if the list exists

- flow `flow`

- element required `value` the element to push.

- flow `flow`

- exists `condition`

- success `condition`

- error `value`

- length `number`

- key `v13.0.7` `value`

| `redis lpushx` |
| --- |
| `lpushx` |

A typical wiring for [pushx](https://docs.rual.nl/block-types/redis/redis_list_pushx): a [function trigger](https://docs.rual.nl/block-types/globals/trigger_custom_function) starts the flow; [value](https://docs.rual.nl/block-types/value/value_default) feeds the `list` pin; [value](https://docs.rual.nl/block-types/value/value_default) feeds the `element` pin; the `flow` out pin feeds [debug](https://docs.rual.nl/block-types/state%20ui/state_debug).

![Studio canvas example for the pushx block: typical wiring for pushx.](https://docs.rual.nl/canvas-examples/redis_list_pushx.png)

### Version history

Introduced in [`v13.0.7`](https://docs.rual.nl/core-versions/130007).

### Service documentation