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Filtering data with react-query library: advantages and examples

Superuser by Superuser
January 22, 2021
Home Software Development
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In this post about react-query library we are going to discuss among those libraries that have actually grown a lot over the in 2015, and appropriately so. In the React universe, the react-redux stack is popular, it has actually been the requirement for a very long time till designers (consisting of those of redux), we have actually seen how we have actually utilized redux beyond our possibilities. We have actually attempted to use redux in every application ever without even asking ourselves if it worked or not. We felt in one’s bones it, we understood how it worked and well, it was our convenience zone.

That has actually not scaled in addition to we anticipated, redux made complex a number of the actions we wished to perform in our application, requiring us to create/modify unlimited layers to include a single action in the UI. This has actually been altering with time, and thanks to libraries like react-query library, we have actually seen how redux was not the only service, in truth, in numerous celebrations, it was not even an option.

What is react-query library?

react-query library is a respond library (no one anticipated it, huh?) that based upon hooks, will permit you to make calls to your API and will handle the cache for you. As simple as it sounds (example drawn from the main paperwork):


function Example() {
const {isLoading, mistake, information} = useQuery(' repoData', () =>>.
bring(' https://api.github.com/repos/tannerlinsley/react-query'). then( res =>>.
res.json().
).
).

if (isLoading) return 'Packing ...'.

if (mistake) return 'A mistake has actually taken place:' + error.message.

return (.

{data.name}
{data.description}
{data.subscribers _ count} {''}
✨ {data.stargazers _ count} {''}
{data.forks _ count}

).
}

As you can see, the hook gets 2 obligatory criteria: the secret and an asynchronous function. The secret needs to be special for each call, considering that it will be utilized to cache the outcome of the function. The function, as anticipated, will supervise of making the HTTP call. Here we ought to not be lured to prevent producing our service layer that will look after this call and make the essential mappings.

In this post we are not going to enter into how to utilize react-query library considering that its paperwork is really total and effectively described, in addition, they have an extremely active discord server where they can fix doubts. (https://react-query.tanstack.com/overview)

Practical example

In our example we are going to note some users from a backend and we need to have the ability to filter that list by state or city. To do this, we will begin with our useQuery hook:


export const useFetchUsers = (filters: FilterMap) => > {
return useQuery(.
["users", filters],.
() => > fetchUsers( filters).
).
}

SUGGESTION: Do not utilize straight useQuery in your container, much better to utilize it inside a customized hook so you can recycle it, to name a few things.

As we can see, the secret is a list (https://react-query.tanstack.com/guides/query-keys), besides, among the aspects in the list is a variable. This will trigger the function to be performed once again when filters alter.

In our container we will need to call useFetchUsers passing it our worths to filter that list (if any). To do this, we will utilize a hook produced the celebration in which the worths will continue the URL and will recuperate them from there and after that pass them to our API.


const filters = useFilters(["city", "status"]);.
const users = useFetchUsers( filters.current);.

useFilters hook is not made complex to comprehend, a minimum of its user interface (https://github.com/OscarGalindo/react-query-filtering-example/blob/631bcbf2cc8ceb56591a71136420c75de70f82d7/src/hooks/filters.hook.tsx). At the end is a hook that exposes one approach and the existing filters.

The example of checking out the existing filters (checked out from the following URL: https://frontend/users?city=East+Tomas&status=blocked) you have in the previous code, filters.current returns the existing filter checked out from the URL.

To alter the filters, the hook supplies a single approach that updates all filters (there is absolutely nothing to edit/delete a single filter, yet …), this is filters.apply( FilterMap).

In the example, we wished to take the filters to a modal to make complex the UI a bit and see how it would work. At the end we have fun with the inheritance of the parts, the UserContainer is the one that opens the modal so we pass the use approach to the Dialog:


const [showFilters, hideFilters] = useModal(() =>>, [filters.current]).

This is where inside we have a kind that when doing send will call the onApply, as simple as that. The hook will internally upgrade the URL and react-query will get the brand-new filters, running the brand-new inquiry with brand-new filters.

As you can see, what in redux would definitely be 5-6 files, about 5-10 actions with their associated legends and reducers, utilizing react-query in addition to the useFilters hook is less than 10 lines.

Conclusion

The post has actually been more technical than conceptual, however there is a lesson to be discovered, which is that we ought to not let ourselves be brought away by the existing, we need to believe things through, and more so in the frontend world where it alters really regularly. This post is not based upon ruining redux in favor of react-query library (or comparable libraries), nor is it based upon ruining the entire thing.

If we return to the example, the state * is plainly in the server, we hand over to it the duty of whatever, we just require that information to paint it, we are not discussing an application that can get to work offline or some diplomatic immunity.

The secret here would be to comprehend where we desire the state, should the frontend have that duty? Should it be shared? Should the backend supervise of whatever? Those are the concerns we ought to ask ourselves in order to discover the very best tool.

* State: When we discuss state we are referring not just to the information, however to the habits of the exact same.

  • Live example: https://react-query-filtering-example.vercel.app/
  • Repository: https://github.com/OscarGalindo/react-query-filtering-example



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Tags: advantagesDataExamplesFilteringlibraryreactquery
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