Useswr mutate. SWR: immediately update UI when mutating data.

Useswr mutate I can think of one use-case where having a no-cache policy is relevant: if you want to pull some data from the backend, mutate it, and then send it back to the db. In order to do this, i'm passing initial data to SWR, and when pagination change, I call a mutate function, bounded to the first SWR request. @shuding Is there a way to locally update useSWRInfinite data? Ex: After submit my comment, it will take 2 request response long, because I can't mutate until request is done and fetching new data also takes time, so it will be a visible delay until is inserted in DOM. This way when the user navigates to the PokemonDetails page, the data will be ready. useSWR mutate function not working as expected. If you know the key you can call mutate(key) and that will trigger a revalidation. the doc. Invalidate the cache for all currently active useSWR queries. To start using the useSWR hook, you need to import it into your component. Instead, I should be able to mutate local data โค๊ดนี้จาก SWR Doc คือ กรณีเรา send request เพื่อ PUT/PATCH ไปที่ API แต่ไม่ต้องรอผลลัพธ์ เราสามารพสั่ง mutate เพื่ออัพเดทค่า data ที่ได้ตอน fetch ทีแรกได้เลย เพื่อทำการ Mutating a GraphQL API is the same thing as what we've seen before. I'm using bound mutate as shown in the cart. See the parameters, options, and return values of the hook, and the details of the mutate function. Use case is deeply nested components that have forms that create data. setData(data. This might be useful if you have a button to allow users to manually refresh a news feed or something. it seems not work in useEffect. Do you like my content? Sponsor me on GitHub Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I'm assuming mutate is still the right avenue to do this, but is there a way that I can tell mutate to invalidate many keys at once? Or ever better, all keys that match /api/items(. How can I : run the post request only when I click on the button; pass in the type prop to my fetcher through useSWR; I want to use swr for deduping. It provides a type-safe mechanism for updating and revalidating SWR's client-side cache for specific endpoints. Let's first import mutate, and client: import useSWR, { mutate } from "swr"; // If you read more of the doc page you can find the bounded mutate, it's function returned by useSWR hook. Assuming you have the following React component. 3 replies Comment options {{title}} Your fetcher function is fine as is. it provides me a bounded mutation which I can use on that page The You can pass data to mutate to update the local state. it looks like this How can mutate an specific object of this array and add an object to the "chatLike" array using SWR? I have the following function: async function sendLike() { const newLike = { idUser: myUser. 0. import React from 'react' import { useSWRConfig } from 'swr' export default function TestComponent() { const { mutate } = useSWRConfig() return ( <button onClick={() => The documentation for mutate talks about local mutation for faster feedback, but the documented way to use it only mutates after a promise has resolved - in other words, not immediately. You can automock the swr module so that mock functions like mockImplementationOnce can be called on useSWRConfig. js/React. js. Because it appears localStorage was available after useSWR init; (even on page refreshes) Share. The data value should always be Prevent useSWR from fetching until mutate() is called. useSWR('/api/data', fetchData) will excute when App props changes. However, the re-rendering makes the component flickering with the loading Update Local Mutate: useSWR を使わなくてもキャッシュを更新できる: Bound Mutate で代用できることが多い: 低: Mutate Based on Current Data: 複雑な処理が可能: バグを引き起こしやすい: 中 I tried to mutate alot of times But it won't work. import {mutate } from "swr" mutate ("/api/me", user => ({ user, name: "Sergio"})). It features: Transport and protocol agnostic data fetching You can revalidate the data manually using mutate when the onAfterClose callback in the modal gets triggered. Close main menu error, isLoading, isValidating, mutate } useSWR (key, fetcher, {revalidateIfStale: false, revalidateOnFocus: false, revalidateOnReconnect: false}) // equivalent to useSWRImmutable (key, fetcher) The revalidateIfStale controls if SWR should revalidate when it mounts and it's possible that the issue is related to the revalidation timing or some internal caching mechanism within SWR. js const {data, error, isLoading, isValidating, mutate} = useSWR (key, fetcher, options) At the right hand side of the expression, we call the useSWR() hook. swr doesn't store or cache data in a persistent storage out-of-the-box. Previously, I would setState with the response from an API and then when operating on it I would just overwrite it with setState. Basic Usage. my use case is very similar. Example: you're editing an entire user profile. My current line for fetching data: const { data: originalData, isLoading, mutate } = useSWR(fetch-table, fetcher); I use uswSWR to handle user authentication: export function useAuthenticatedUser() { const { data, error, isLoading, mutate } = useSWR("user", UserApi productIds is what changes all the time. It works. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company In Component A we had details of resource one and a form that creates a new object of type resource two. SWR not pulling from cache. fetcher can be any asynchronous function which returns the data, you can use the native fetch or tools like Axios. const {data, mutate } = useSWR (['/api/some-route', someKey], fetcher); mutate With that being said, I agree, it would be awesome to be able to refresh data based on any of the keys passed to the array, from anywhere throughout an application. ; In this fourth article we'll see how The bound mutate function is returned from the useSWR hook wherever you implement it. This allows you to watch data or build your own computed props. name resolves to an empty string '', meaning useSWR will not call the fetcher function as the key param is a falsy value. This pattern is to fetch data and revalidate it later. useSWR is only used to query data, and it's triggered immediatly when the component mounts, you don't want that for a data insert or update. Latest version: 2. log(data[messageIndex]) // This log returns specific object in the array // Handle mutation }, false ) socket const { data, mutate } = useSWR(key, fetcher) mutate() // this will trigger a refetch Share. The sendRequest function will be called when the button is clicked, with the extra I think that's a little redundant, you could be better using one or the other, SWR is intended to use the cache as a local state, because that state lives on the server it's more adecuated and frees you from managing every manipulation in the state verbosely, like you have to do with redux explicitly calling API calls anytime you dispatch an action. useMutate is a wrapper around SWR's global mutate function. 推荐使用 useSWRConfig hook 获取全局 mutator： TypeScript. It is functionally equivalent to the global mutate function but does not require the key parameter. Manual Revalidation: Manually trigger a revalidation using the mutate function. loading, etc. Contribute to vercel/swr development by creating an account on GitHub. Follow answered Dec 16, 2021 at 9:52. What i have read is that you can call swr like this : const { data } = useSwr('same route as previous one') When not using SWR I would updated my set state like this once I had deleted an item for example. The reason of this behavior is that although SWR returns stale data, it can't return wrong data. This can help handle race conditions and revalidation correctly together with useSWR. Cái tên SWR vốn có nguồn gốc từ stale-while-revalidate, tức là một chiến lược vô hiệu hoá cache được phổ biến bởi HTTP RFC 5861. When a comment is submitted, it only gets displayed once the page The objects in the array are rendered in a table that is editable, meaning the user can modify a cell, and then its value is updated in the MongoDB database. Use null or pass a function as key to conditionally fetch data. Repro Steps / Code Example I'l You can also use useSWR's global mutate('/api/users') anywhere in the app to force update & revalidate state or you can even pass bound mutate functions right from the GlobalDataProvider like //global-data-store. This is because SWR already has the value so it can return from the cache. occasionally our app performs an asynchronous "sync" action that in effect invalidates like a dozen or so other endpoints that should immediately refetch (and some use pagination query params in their keys). Without prefetching, our users will have to wait for the new data to be fetched. If you reload your browser, you'll always fetch the same thing again, effectively losing any cache or revalidation capabilities. If I use mutate from const { mutate } = useSWRConfig(), it will not work. Prevent useSWR from fetching until mutate() is called. The name “SWR” is derived from stale-while-revalidate, a HTTP cache invalidation strategy popularized by RFC 5861. Unable to display JSON record retrieved from SWR in NextJs. Put the `response. Or, maybe you're using React Native web, and not all screens are If you are using bound mutate, it's easy to mutate the cache. I am using useSWRInfinite for the pagination feature and trying to update comments like state with bound mutate function with optimisticData option since I wanted to refresh the data immediately. Revalidation in useSWR. In my case, I want to sort the data with a button press. Take a closer look at the useSWR hook: const { data, error, isValidating, isLoading, mutate} = useSWR( key, fetcher ); Firstly we imported useSWR hook. There're 2 ways to use the mutateAPI to mutate the data, the global mutate API which can mutate any key and the bound mutate API which only can mutate the data of corresponding SWR hook. useSWR functions the same and accepts all the options that SWR's useSWR hook does. For the purpose of this post, we will be focused on using SWR in the context of a Next. This allows you to de-couple the revalidation from the useSWR hook itself. key is a unique string for the request which is like an id. It does so by providing the hook useSWR which can be called from a component that is dependent on fetching data. To implement this, let’s first re-export the mutate field from our usePosts hook from hooks I'm stuck with Vercel's SWR mutate system. In this article, we’ll look into the new useSWRMutation hook in SWR. Unlike useSWR, useSWRMutation will not immediately start the request upon rendering. import useSWR, { SWRConfig } from 'swr' function App Correct, calling a bounded mutate with no arguments will trigger a refetch. Using useSWR hook : It reduces the amount of code to write to fetch data resulting in clean and maintainable code. *) ? Thank you! 数据更改 & 重新验证. Greetings, I am having an issue with some unexpected behavior with regards to mutate(key). If, for some reason, you don't want to replace your imports, you can use the useSWRNativeRevalidate hook. You can just store the result of useSWR in an object: const res1 = useSWR(. Reload to refresh your session. SWR is more intended to get data, not update it, usually you have another function to update and after it you will run mutate to update the cache and trigger a revalidation (SWR will fetch it again) const profile = useSWR(() => ['/api/profile', params]) Here is the basic pattern: const { mutate } = useSwr() mutate( data=>{data, newElem: 'foo'} ) I have a case where multiple async operations fire mutate in an async callback, but I noticed that the final Has anyone encountered this? Here is the basic pattern: const { mutate } = useSwr() mutate( data=>{data, newElem: 'foo'} ) I The useSWR hook is the cornerstone of the SWR library. For Server Side components refer to my previous article. 2. Thank you :) 👍 I currently went with the easier solution, i. Beta Was this translation helpful? Give feedback. ; In some cases, we might want to revalidate data in If you need to manually mutate a key, please consider using the SWR APIs. This can be useful if you want to update the Let’s look at a more complex example that utilizes more of the parameters that useSWR returns. The sendRequest function will be called when the button is clicked, with the extra Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company mutate in useSWR hook not updating the DOM. Let's say I change the id via the UI and want to show loading indicator. I saw this answer by @shuding and it definitely works, but it triggers a fetch when all I want to do is mutate data (if it has already been fetched). If the API has not yet I ran into this issue while invalidating keys using the global mutate function. Instance of config called from useEffect is cleared as expected. I haven't found a better way to mutate the cache of the end point with query parameters while using global mutate. The problem is that the page isn't re-rendered, when I print the result of the mutate function, i see that the data has changed but the page just isn't re-rendered and i can't understand why. useSWR successfully fetches , but data returns undefined. Every useUsername will share the same state, and calling setUsername will update the state across all uses of the hook. There are 1627 other projects in the npm registry using swr. Instead, it returns a trigger function that can later be called to manually start the mutation. In your projects, you almost always use useSWR hook. So, if you pass it again to mutate, for mutate, the object is still the same and hence, it won't trigger a re-render. To implement optimistic UI updates with SWR, you need to use the mutate function provided by the hook. 4. To implement this const { data } = useSWR('/url', { revalidateOnMount: false, revalidateOnFocus: false }) For best practice, I want to share my experience: File structure: we can organize every request into a hook. . I want to make user know that table is refetching the data by showing the loading indicator. Fetch and Revalidate. useSWR SWR is a React Hooks library for data fetching. In the docs The example above defines a sendRequest mutation that affects the '/api/user' resource. Remember that in SWR { data } = useSWR(key) is mentally equivalent to v = getCache(k), where fetcher (validation) just write to the cache and So I think it might not be right to think of it as an improvement in that scenario, since it's actually there to trigger the first fetch of data, as opposed to mutate and useSWR for which data is always automatically fetched. It simplifies data fetching in React applications by providing a declarative way to manage the loading, error, and data states. NEXT_PUBLIC_APP_URL + '/api/users', fetcher, { }) hook will re-run and return the updated Need help on using mutation with useSWRInfinite EXPECTED On my posts page, I used useSWRInfinite to do load posts with pagination. You would however need to disable revalidation for the data to make sure it's not refetched, so it's probably better to store the local/modified state separately. Crowder what if I @oran1248 Depending on what you mean by "load the page again", I don't think swr would work the way you seem to be describing it. This The way to do this is to update the key that useSWR uses (the key is the first argument to useSWR) in which case it'll just refetch automatically whenever the id changes, with the correct loading/error/etc states Bound mutate. Follow answered May 9, 2020 at 19:54. mutate(key) (または単にバウンドミューテートの mutate()) をデータの指定なしに呼んだ場合、そのリソースに対して再検証を発行 (データを期限切れとしてマークして再フェッチを発行する) します。この例は、ユーザーが "Logout" ボタンをクリックした場合に、 ログイン情報 (例: <Profile/> の Bound mutate() The SWR object returned by useSWR also contains a mutate() function that is pre-bound to the SWR's key. This diagrams describe how SWR returns values in some scenarios. Simply use a string as the key parameter Even though I am passing optimisticData to the mutate, It doesn't update the data immediately. There is no way to mutate data fetched with useSWRInfinite without first fetching the data client-side. Or simpler The issue is that you are re-using the same constant variable names. When the checkbox is clicked, we make a PUT request to update our todo, and we call mutate to update useSWR’s cache. The good thing is we can include an event handler to detect when the user’s mouse is over the PokemonCard and start fetching the data at that moment. You can use conditional fetching in the useSWR call to prevent it from making a request. - Prisma migration for `Integration`: adds `is_enabled` and makes `config` optional - Use Nextjs `useSWR`'s `mutate` to fetch and make updates - Get Revalidate the data using ‘mutate’ The mutate function is essential for fetching fresh data and updating the UI dynamically. It would be nice to clear SWR's cache outside of hooks (for example: inside a reducer), same as with version <1. ; In the third article we learned how to share data between components with React Context, without using globals, singletons or resorting to state management libraries like MobX or Redux. This option exists in case useSWR makes some big changes to their API or something down the line. mutate from useSWR will just update the global cache key for the infinite list, not the individual pages as this code would assume. Industries. Solutions. When called with a unique key, it triggers a re-fetch of the data Prevent useSWR from fetching until mutate() is called. 8. So you are here because you want to use useSWR data fetching into your react or react native application. The key it uses is the same key as the useSWR request. it can be used anywhere within a component without having to pass the request key to it. The bound mutate is returned by the useSWR hook, and is basically a shorthand to the global mutate, that does not need a key. ); And then reference each property like normal: res1. Another option is to . Using the mutate function, we can optimistically update the UI and revalidate the data in the background. See code examples, sandbox link and project demo. You certainly wouldn’t want to be calling mutate on every keystroke. mine is to clear the cache before calling useSWR: I see the documentation using the hook useSWRConfig, it also explains the difference of a "bounded mutate", but I cannot seem to find anything about the mutate from the import. The key is a unique string representing the URL to the API endpoint. it‘s my first time to use this library. SWR comes with a nice function called mutate that let you change the cached data for a given key, it comes with multiple different options but one of the nicest one is to pass a function, get the current data and update it, from anywhere. SWR is friendly for apps written in TypeScript, with type safety out of the box. During the first I have a component that fetch data on mount thanks to a useEffect hooks. Im not sure how to do this. It is only a very small wrapper that adds tRPC types and creates a fetcher using tRPC's vanilla client. This hook returns a trigger fn that you can execute the moment you want your insert to run. This is useful for operations like creating, updating, or deleting records. By default, SWR uses a global cache to store and share data across all components. Revalidate if stale: Automatically revalidate even if there is stale data. Key Change. Shu Ding Shu Ding. There is such option for useSWR - dedupingInterval. Using SWR. The issue occurs because in the production build fetchAllItems. Instead use useSWRMutation. jsx export function GlobalDataProdiver (props) import useSWR from 'swr' const useUsername = => {const {data: username, mutate: setUsername} = useSWR ('username', {initialData: '',}) return [username, setUsername]} It works, no context required. If the function throws or returns a falsy value, SWR will not start the request. SWR: immediately update UI when mutating data. filter((d) => d. userId, } mutate( async (data) => { console. You can either use the global mutate, bound mutate, or the useSWRMutation Hook. 2. Is possible The swrv library is meant to be used with the Vue Composition API (and eventually Vue 3) so it utilizes Vue's reactivity system to track dependencies and returns vue Ref's as it's return values. What I am doing and trying to achieve. The API and requests works fine but the data is never updating. { data } = useSWR( 'dummy-key', async When user click it, I'm refetching the table by using mutate() but isLoading not becoming true so that loading spinner not showing. J. The latter two parameters are identical to those in bound mutate. The reason for my approach is because I have two components in my page where one displays completed quotes and other all the quotes. The issue is that my custom hook which uses useSwr is fetching all data initially whenever the hook is initialized. Mutate is working, what I'm struggling to do is The mutate pulled from useSWR is pre-bound to that particular request, i. You signed in with another tab or window. data` value into the `setState[]` array. Both features come into play mutate(input: Input, config: Omit<Options<Input, Data, Error>, 'onMutate' | 'useErrorBoundary'> = {}): Promise<Data | undefined> The function you call to trigger your mutation, passing the input your mutation function needs. 3. SWR not serving stale data? 1. This is intended. Modified 4 years, 2 months ago. Instead of passing down callbacks with bound mutate from the parents with the queries /* Usage */ const { mutate } = useSWR(url, fetcher, { revalidateOnFocus: false, }); const { mutate } = React. 13. The mutate method is provided the key to mutate in the onClick trpc. In this example, we fetch a single todo, and we render a checkbox to toggle the completed status of the todo. I read the documentation for SWR and found the following way to update the cache directly. Ali Raza Ali Raza. I'm going to try to explain my situation, I hope I can make it. I am having an issue with some unexpected behavior with regards to mutate(key). Keep in mind that an remote fetching comes from fetcher functions that are supplied by you, so you just configure it there. I would recommend 再検証. Is there any difference aside from one being bound to the component lifecycle? Using the import is quicker and more direct it seems. This is possible in a single page/component. SWR hands the rest -- caching, mutation subscriptions, etc. thanks for your replies, i was mutating on logout, but with undefined. The problem is, I need an indicator that this request is ongoing, something like isLoading flag. mutate #. I have tried using just the normal useSWR function without the pagination feature and it worked well as I expected. Don't forget to await whatever you're doing, else mutate might run prematurely. In our LovelyNameComponent, that would look like this: export function LovelyNameComponent (lovelyId: string): JSX. SWR - Uncaught TypeError: Cannot read properties of undefined. I'd like it to not refetch data on mount, and instead use the 'cached' data provided by useSwr hooks when i re-navigate to this component. This hook is focused on Mutation & Revalidation in SWR. The useSWR hook also provides a mutate function that allows you to update the data in real-time. Client Side Data Fetching. import Upon submission of the user's input, we call mutate with local data (and revalidation disabled), then set isEditing to false, and expect the "post" to display that new data sent to mutate. The issue is that mutate does update the cache, but changing isEditing causes a re-render, which then causes the original SWR call to revalidate. So, when the form is submitted, Component B should be updated to show the new object of type resource two that was created. 有两种方法可以使用 mutate API 来进行数据更改，全局数据更改 API 可以更改任何 key 的数据，而绑定数据更改只能更改对应 SWR hook 的数据。. useMutate . With that being said SWR is not specific to Next. Currently the initial fetch is happening even without calling mutate. I'm using useSWRInfinite as a workaround for needing to make a dynamic number of useSWR calls and this difference has caused some bugs in my application. 0. 全局数据更改 #. SWR 提供了 mutate 和 useSWRMutation 两个 API 用于更改远程数据及相关缓存。. In the first article we described how we load and display data with hooks. State list change not causing re-render Next. I am trying to use the useSWR hook to fetch data from an API. Meaning the useSWR(process. g. 5, last published: 10 months ago. The mutate function allows you to update the cached data without making a new network request, allowing you to pre-fetch data and keep it up Learn how to use the useSWR hook to fetch and cache data in React, and how to mutate the cached data with the mutate function. You can also do the same thing by disable the following revalidation options: useSWR(key, fetcher, { revalidateIfStale: false, revalidateOnFocus: false, revalidateOnReconnect: false }) // equivalent to useSWRImmutable(key, fetcher) const { mutate } = useFoo() useEffect(() => { mutate Step 5: Use the mutate function to update the data. Then we used it in our custom hook with two parameters: key and fetcher. I was looking for the most optimal way to write the function as I feel like my solution is a little hacky and I'm Bug report Description / Observed Behavior. The mutate function allows you to update the cache of the data without making a request to the server. The useSWR hook is React only, but the cache and global mutate function is exposed and you could access it outside React. Improve this answer. See also: Mutation, Reset Cache Between Test Cases. In SWR there exists a mutate function to which you pass the key, an optional data and a boolean value that indicates if the api should Hi, have you considered to deduplicate mutate and useSWR? E. you can add a custom fetcher to your useBackend hook, and if the revalidation still doesn't seem to update the cache, you can try to force revalidate the data after the mutation has completed by manually calling the mutate() function without any arguments useSWR() and mutate() do not behave as expected when component is unmounted. and its the easiest way to revalidate the data. Because data is no longer undefined, the same logic fails. Start using swr in your project by running `npm i swr`. Finally, it returns data, error, isValidating, isLoading, and mutate variables. (client-side perspective) Intro. Viewed 2k times 4 . It accepts the following arguments. e. Here’s how it works: Intro. It features: Transport and protocol agnostic data fetching SWR provides an excellent way to mutate data, which means updating or changing the cached data. Currently the data goes back to undefined whenever the key changes. js app with useSWR. SWR is a React Hooks library for remote data fetching. How to mutate specific object in an array using SWR. Thanks for the reply. For example, when a fetch Question about useSWR and mutate behavior when component is unmounted . To solve this problem using the mutate function exported directly by swr, it will suffice just to pass the same key to both useSWR and mutate. Since they have the same SWR key and are rendered at the almost same time, only 1 network request will be made. The URL that is passed to the useSWR() hook just serves as a key that marks all data accessed that way as 'dirty' and worthy of revalidation (refetching). About. But sometimes we need to use global mutation. export function useCars(registrationPlates: number[], shouldFetch): ICars { const { In this example, the useSWR hook accepts a key string and a fetcher function. This article mentions data fetching strategy for Client Side Components in NextJS. Expected Behavior To send a new request. – kmp. Like global mutate, this mutate wrapper accepts three parameters: key, data, and options. you make mutation anywhere (web socket listener, parent component, etc) and no need to revalidate with useSWR in interval. The fact that a mutate fn is returned it's only to revalidate, or rerun said query. Pokemon Details Page. This pattern is to fetch data and change the key and revalidate it later. Hot Network Questions Is bash's expansion of unset parameters to the empty string documented anywhere? Labelling marker line with distances in QGIS I’m looking for short stories that I read in anthologies in the 1960s. And we can't remutate to undefined since the first argument of mutate() is optional (and so mutate with undefined does nothing). We can then go-ahead to call the mutate() in an onClick or any other event or function you want. A complete guide to efficient data fetching and caching. As before, mutate should be called when you Now if we inspect we'll notice there's one query made but 2 instances of useSWR with the same query. In my data fetching code, I have these hooks/functions: The following examples show how to use swr#mutate. According to the docs, I'm able to use the mutate function that gets returned with the hook to optimiscally update the cache and being able to di I have a form component where users can enter a comment, and a separate component which maps through and displays a list of comments. Commented Sep 27, 2021 at 11:27 @T. Instead, you can use an array as the key parameter, which contains multiple arguments of fetcher: I'm using useSWR to fetch data from client side in nextjs. / mutate in useSWR hook not updating the DOM. I would really appreciate any help. Learn how to use useSWR, a React hook by Vercel, to fetch data from FakeStore API and handle errors, revalidation, mutation and more. SWR first returns the data from cache (stale), then sends the fetch request (revalidate), and finally comes with the up-to-date data again. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I'm currently using SWR to fetch my data for client components in a NextJS project. If your page contains frequently updating data, and you don’t need to pre-render the data, SWR is a perfect fit and no special setup is needed: just import useSWR and use the hook inside any components that use the data. 5. Getting it from SWR function useSWRConfig(). Because the identifier (also the cache key) of the data is '/api/user', even if token changes, SWR will still use the same key and return the wrong data. If the mutate function does not re-fetch and add the entry back to the cache, once a component does mount which tries to read from the missing cache key, swr will just You can but only when your component mounts, because you need to wait for the api response in useSWR(), add the data as dependency so whenever it changes, it'll rerender. Trying to force the SWR hook to give you both server data and local data at different times will just be a mess. key can be either a path alone, or a React Hooks library for remote data fetching. This hook is used for subscribing to real-time data. It keeps waiting until The API call is done and then gets updated. 932 9 9 silver SWR not re-rendering when mutate is called. It seems it doesn't solve my If I use mutate returned from the useSWRInfinite call, it will work. use useSwr immediately on the component that uses the data. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You switched accounts on another tab or window. All the Bug report I'm using useSWR hook to call an an API. Hot Network Questions Im mostly using SWR to get data, however I have a situation that I need to update data. All reactions. Does swr useSWR hook have to send HTTP request for revalidation every It has the same API interface as the normal useSWR hook. fetcher is an async function that accepts key and returns data. In my data fetching code, I have these hooks/functions: Now I want to make use of SWR mutate to mutate the cached data and don't reload the list of data from the server. You can pass an updater function to mutate, which receives the current data as an argument and returns the updated data. Nobody wants to send same API request to fetch same data and incurr extra cost on pro rata You signed in with another tab or window. But If i delete one of the record, in the second div no change will happen Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company The useSWR hook provides an extensible interface to retrieve data in the most effective manner possible. Expected Behavior. import useSWR from Hi! With the key provided to useSWRMutation, SWR can be aware of which resource the mutation might affect. 1,675 14 14 silver badges 17 17 bronze badges. Insights. From useSWR Conditional Fetching docs:. js code. You signed out in another tab or window. 1 You must be logged in to vote. ); const res2 = useSWR(. Using the mutate function, we can optimistically At its core, SWR provides robust functionality for efficiently fetching data. Now, if you update some deeply nested object in data, it doesn't change the data reference. You have two options to solve the problem. NextJS and SWR. What I've tried. data will be undefined again when you change the key (id), if it doesn't have a cache value. useSWR doesn't work with async fetcher function. Code: Tại sao nên sử dụng SWR? SWR là một thư viện React Hooks dùng trong việc fetch data. Open main menu. It still points to the old object. For example, the key function is implemented as Vue watcher, so any changes to the dependencies in this function useSWR returns data, error, isLoading, and isValidating depending on the state of the fetcher function. useSWR returning undefined data with axios in nextjs. Đầu tiên, SWR trả về một data từ cache (tức data cũ). env. It's convenient to reuse those requests. The text was updated successfully, but these errors were encountered: Firstly we imported useSWR hook. Here’s a brief information about each approach: Revalidate on Focus: By default, useSWR revalidates the data when the window is focused. Using Immer with SWR to mutate data. In my case I use @sergiodxa 's approach for the hook, together with the rendering the component based on conditions as in the snippet below. It's important that the data you're editing is as up-to-date as possible. React state update (SWR) and component refresh? 0. Here is the code: import useSWR from 'swr' import { SERVER_URL } from '. js application. So, if say on action you change the the productIds, and you remove or add some, then call mutate() right after. However, I can't do this in multiple pages because the data is automatically fetched from the server after I redirect to the index page. This function update the I am assuming that the data property you use in handleAddRowClick is the same that you get from useSWR. Bug report Description / Observed Behavior I want to revalidate the data/send a new request using the global mutate function. ; In the second article we learned how to change remote data with hooks. Results. 1. No need to manage a lot of state and side SWR provides an excellent way to mutate data, which means updating or changing the cached data. The primary usage of useSWR Now we've handled querying data with useSWR We can now mutate data too! To do this we will: Send a query to our API; Update the SWR cache manually with the response; I have some data from a public API that I fetched using useSWR, now I want to operate on that. The fetcher will pass the key to the fetcher function and then proceed to useSWR ('/api/user', url => fetchWithToken (url, token)) This is incorrect. Let's finish our application by adding the ability to remove items using mutate. “I am fed up of making HTTP request The example above defines a sendRequest mutation that affects the '/api/user' resource. The main difference between useSWR and useSWRMutation hook is mutate: This is a function to modify the cached data. So when the user clicks 10 times very fast on the vote button it just refetches it after Using CRUD operations with React SWR for mutating REST API cache # tutorial # javascript # typescript # api Optimize your Next. key is a unique identifier of the data (normally the API URL) and will be passed to fetcher. In my case, I could regenerate the cache key I wanted to invalidate, so I delete the entry from the cache before calling mutate. The function We would like to show you a description here but the site won’t allow us. useSWR hook offers several different approaches to keep data fresh and updated. Here is an example with bound mutate. data is the variable returned from fetcher. By default, SWR will also infer the argument types of fetcher from key, so you can have the preferred types automatically. Ask Question Asked 4 years, 2 months ago. const { data, mutate } = useSWR('/api/user', fetcher) mutate() //run mutation hey this really helped me! it would be great if there was something in the docs about this. useSWR to get get data of specific ID. One useful feature of useSWR that we haven’t discussed yet is the useSWRSubscription Hook. how can i use useEffect let it only work in componentDidMount. useContext(SwrMutationContext); handleApiRequest('Client SWR is a React Hooks library for data fetching. From the docs: Each component has a useSWR hook inside. #1 Use hardcoded string as useSWR key. This will invalidate the cache Prefetching: The useSWR mutate function can be used for data prefetching. My goal is to fetch only when I call mutate. To reflect the changes, I'm using the mutate() function from the SWR library, which, if there are any changes in the data, uses the data returned by the endpoint to update the table view. I'm working on a social media app, it's something like a combination of Instagram and Twitter. React Hooks for Data Fetching. This is handy to mutate data for an existing query. //App. _id !== id)); But I am not really sure how to do this now. But useSWRConfig(), which is placed deeper in the components tree (just close to useSWR - to check state of the cache), is returning data same as before clearing. wfoz efjylz udhksa ctjvec lrimcw igbwy elgiv eddpm ipxarf coryxv