What's the best way for data initialization and reuse state data?
I'm using Refine with supabase. I want to have data initialized when the app first load, save those in state, then map that in my componenents when needed without calling the api again.
I'm thinking of using useContext and useContext.Provider with useState for the data and setData, wrapping that outside my Refine app. Then create another component called DataInitialization to call the data and setData in Context, like this:
// DataInitialization.tsx
const DataInitialization: React.FC = () => {
const { data, isLoading, isError } = useList<TCountry, HttpError>({
resource: 'dataCountryList'
});
const { setData } = useDataCountryList();
useEffect(() => {
if (!isLoading && !isError) {
console.log('Country List pulled', data.data);
setData(data.data);
// Additional API calls and state setting can be done here
}
}, [data, isLoading, isError, setData]);
return null; // This component doesn't render anything
};
export default DataInitialization;
What do you think, is there a better way? Do I really need to install another library? I want to use the existing Refine React Query.
5 Replies
Hi @lukevo.. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:
----------------------
Your approach of using
useContext
and useContext.Provider
with useState
for the data and setData
is a valid way to manage global state in a React application. However, you might not need to do this if you're using Refine and React Query.
Refine uses React Query under the hood for data fetching, which provides a caching mechanism out of the box. When you fetch data using useList
, the data is cached and any subsequent calls to useList
with the same parameters will retrieve the data from the cache instead of making a new network request. This means you can call useList
in any component that needs the data, and it will not result in additional network requests once the data is cached.
Here's an example of how you can use useList
with caching:
In this example, a state fetch
is used to control when the data is fetched. When the component mounts, if fetch
is false
, we set it to true
and call refetch
to fetch the data. Once the data is fetched, any subsequent calls to useList
with the same parameters will retrieve the data from the cache.
This approach allows you to fetch and cache data at the start of your application, and then use that cached data in your components without additional network requests. You don't need to install another library for this, as it's a feature provided by React Query, which is already used by Refine.
Sources:
- Discord support thread: invalid hook call error (https://discord.com/channels/837692625737613362/1144003422006288494)
- Building a React Admin Panel with refine and daisyUI (https://refine.dev/blog/daisy-ui-react-admin-panel/)
----------------------
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exotic-emerald•10mo ago
@kapa.ai Thank you, let's help me apply this to my situation. What file should I create, what code should I modify in Appjs, what is the full code for anything that is needed for this to work, let's say I want to call api in <DataInitialization/> and use the data already called in another component. Show me full code for each
Let me check the knowledge base for you. One moment! :books:
----------------------
Sure, let's break it down step by step.
First, you need to create a new file for your
DataInitialization
component. Let's call it DataInitialization.tsx
. Here's the full code for this component:
In your App.tsx
file, you need to include the DataInitialization
component at the root level of your application. Here's how you can modify your App.tsx
:
Now, in any other component where you need the data, you can use the useList
hook with the same parameters to retrieve the cached data. Here's an example:
In this example, useList
retrieves the data from the cache, so it doesn't make a new network request. The data is the same data that was fetched in the DataInitialization
component.
Sources:
- Discord support thread: invalid hook call error (https://discord.com/channels/837692625737613362/1144003422006288494)
- Building a React Admin Panel with refine and daisyUI (https://refine.dev/blog/daisy-ui-react-admin-panel/)
----------------------
Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:
----------------------<@582491401715974144> kapa.ai is still learning and improving, please let us know how it did by reacting below