Скачать или смотреть How to Properly Dispatch asyncThunk Inside Another asyncThunk in Redux Toolkit

Discover how to manage async thunks in Redux Toolkit effectively, avoiding common pitfalls and ensuring proper data chaining in your React application.
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How to Properly Dispatch asyncThunk Inside Another asyncThunk in Redux Toolkit

When working with Redux Toolkit in a React application, you may find yourself needing to dispatch one async thunk from another. While this design pattern can be useful, it’s crucial to implement it correctly to avoid unexpected behavior and errors. In this post, we'll explore how to do this effectively, including common mistakes and alternative approaches to managing chained asynchronous actions.

Understanding the Problem

You may have encountered an issue where you want to call foo() (an async thunk) inside bar() (another async thunk). If not implemented correctly, you might see foo being dispatched but not bar. Let's break down how to achieve the desired behavior without running into issues.

Here’s a typical structure of how you might initially try to implement this:

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Example of Incorrect Dispatching

You might dispatch bar like this inside a React component:

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The approach above doesn’t yield the expected results because of how asyncThunk works under the hood.



A Correct Approach: Chaining Thunks

The solution is straightforward; however, it's crucial to note that this pattern can lead to complexity. Here’s how you can properly dispatch one async thunk from another.

Step 1: Define Your Thunks

Make sure the second argument in the createAsyncThunk is properly used to access the dispatch method. Here's a correct implementation:

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Step 2: Dispatch from Your Component

Now, dispatch bar in your component correctly:

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This code ensures actions are dispatched in the correct order, leading to expected results.

Recommended Patterns: Separate Actions

While chaining thunks can work, it may be better to separate the concerns. Instead of having bar depend on foo, consider handling the logic directly in your component. If bar needs data from foo, you can pass that data as an argument.

Example: Fetching Related Data

Here’s an example of fetching a post then fetching a user based on the post's userId:

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This pattern results in better separability of features and makes your components easier to manage.

Conclusion

Chaining thunks can be done effectively with proper usage of dispatch, but it's vital to weigh the implications of this design choice. Separating actions and managing dispatch in your components often leads to cleaner, more maintainable code. Keep these strategies in mind as you refactor your async logic with Redux Toolkit.

By understanding the nuances of async thick, chaining, and effective state management, you can create responsive and robust applications!