Fixing Getter Does Not Update in Vue 3 with Pinia When Route Params Change

Discover how to ensure that your Vue 3 `Pinia` store getter updates reactively when route parameters change. Learn the steps to implement computed properties effectively.
---
This video is based on the question https://stackoverflow.com/q/75902722/ asked by the user 'mikeb' ( https://stackoverflow.com/u/1022260/ ) and on the answer https://stackoverflow.com/a/75919143/ provided by the user 'mikeb' ( https://stackoverflow.com/u/1022260/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Getter does not update when route param updates

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/licensing
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/by-sa/4.0/ ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/by-sa/4.0/ ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Fixing Getter Does Not Update in Vue 3 with Pinia When Route Params Change

When building applications with Vue 3 and Pinia, you might face a common problem: your store getter does not automatically update when the route parameters change. This issue can lead to stale data being displayed in your app, which is not ideal. In this guide, we will dive into the details of this problem and explore a straightforward solution using computed properties to ensure your data reflects the current route parameters dynamically.

Understanding the Problem

In our Vue 3 application, we have a parameterized route and a store getter that retrieves a list of items based on the current route parameter. Here's a simplified overview of the situation:

When the route changes, the parameter state updates.

However, the getter that relies on state remains unchanged until the component is reloaded. This is because the value retrieved from the getter does not automatically re-evaluate when the route changes.

Example Scenario

Here's how the original implementation might look:

[[See Video to Reveal this Text or Code Snippet]]

In this setup, even if state updates due to a route change, incs does not automatically re-evaluate, resulting in outdated data being displayed in the UI.

Solution: Utilizing Computed Properties

To ensure that your getter responds to changes in route parameters, we need to utilize Vue's computed properties effectively. This will create a reactive link between the state and the list of items pulled from the store.

Step-by-Step Implementation

Here’s how to modify your code to include computed properties for a reactive update:

Import necessary modules: Make sure you import computed from Vue along with your store and router.

Define your state and incs using computed: This will allow both to be reactive when the route changes.

Here’s the revised code implementation:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Code

Reactive State: We define state as a computed property that will always return the current value of the state parameter from the route. This ensures that whenever the route changes, state recalculates.

Reactive Items List: The incs computed property calls the getByState method from the Pinia store using the latest value of state. This guarantees that the incs array is always in sync with the current route parameter.

Conclusion

By utilizing computed properties in Vue 3, you can effectively address the issue of your store getter not updating when route parameters change. This ensures your UI remains responsive and shows the correct data as users navigate through your application.

If you found this post helpful or if you have any other questions about Vue 3, Pinia, or any related topics, feel free to leave a comment below!

Видео Fixing Getter Does Not Update in Vue 3 with Pinia When Route Params Change канала vlogize