rtk query mutation example

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There has to be one API slice per app for RTKQ to work best. For example, I have two components. We still need to manually tell the mock server when to send new notifications, so we'll continue faking that by having a button we click to force the update. Copyright 20152022 Dan Abramov and the Redux documentation authors. Redux Essentials, Part 7: RTK Query Basics | Redux You should also see how RTK Query can simplify the process of fetching and using cached data. When the number of active subscriptions goes down to 0, RTK Query starts an internal timer. In that case, you can make a sub-selection of fields for that object. Calling the "mutation trigger" returns a promise with an unwrap property, which can be called to unwrap the mutation call and provide the raw response/error. Dispatching an action to set the user state. React Redux Toolkit RTK Query Crash Course - YouTube Redux Essentials, Part 8: RTK Query Advanced Patterns These examples are not meant to be what you base your application on, but exist to show very specific behaviors that you may not actually want or need in your application. By calling selectPostsForUser(result, userId) every time, it will memoize the filtered array and only recalculate it if the fetched data or the user ID changes. We can use the builder.addMatcher() API inside of extraReducers to add a case reducer that runs whenever we match one of those two action types. Copyright 20152022 Dan Abramov and the Redux documentation authors. This applies regardless When using fixedCacheKey, the originalArgs property is not able to be shared and will always be undefined. The top one will only update after a successful mutation and resync with the server. Recently I started using RTK Query and I have a problem with selecting data from the store after mutation. But, the component mounted right away and subscribed to the same Post data with the same cache key. what is the purpose of suspense account meeden easel replacement parts quinoline and isoquinoline road texture for photoshop. The first item in the tuple is the "trigger" function and the second element contains an object with status, error, and data. This example uses a matcher from the endpoint and extraReducers in the authSlice. Typically, the usage pattern is: Our mock Websocket server file exposes a forceGenerateNotifications method to mimic pushing data out to the client. Let's see this in action! Let's start by taking a look at the code for the useGetTodos.js file. const [getUser, { isLoading: isUserLoading }] = useGetUserQuery (resultFromLoginMutation); And I don't know how to do that. Implementing RTK Query in a React Native App - Bionic Julia When we save the edited post this time, we should see two requests happen back-to-back: Then, if we click back to the main "Posts" tab, we should also see: Because we provided the relationships between the endpoints using tags, RTK Query knew that it needed to refetch the individual post and the list of posts when we made that edit and the specific tag with that ID was invalidated - no further changes needed! If Component B then mounts and also calls useGetPostQuery(42), it's the exact same data being requested. RTK Query supports splitting out endpoint definitions with apiSlice.injectEndpoints(). Next up, we'll convert the list of users. Here's some suggestions for when you should consider using them: We've completed updating our posts and users data, so all that's left is working with reactions and notifications. However, if a new subscription is added before the timer expires, the timer is canceled, and the already-cached data is used without needing to refetch it. When you click on a "View Post" button, you should see a second request to /posts/:postId that returns that single post entry. We can implement the optimistic update by finding the specific Post entry in the getPosts cache, and "mutating" it to increment the reaction counter. Previously, we had a normalized lookup table for all of our notifications, and the UI selected those as a single sorted array. Finally, we need change the selectors we're exporting from this slice. Enter RTK Query. The last component that is reading from the old postsSlice is , which filters the list of posts based on the current user. We're going to repurpose this slice to instead store "metadata" objects that describe the read/unread status. // if you actually want the payload or to catch the error. The RTK Query docs have a table that describes what will happen if certain general/specific tag combinations are invalidated. It's common for clients to need to extract pieces of data from the server response, or to transform the data in some way before caching it. Once we call a mutation endpoint that is defined to invalidate this tag, all of the query endpoints that have this tag will automatically refetch and update the cache (the store). That way, we can still have a single API slice with a single middleware and cache reducer, but we can move the definition of some endpoints to other files. In the event of an error, you'll see this get rolled back. RTK Query Best Practices - Medium Data Fetching in Redux Made Easy With RTK Query - Scott Logic Since the usersSlice is no longer even being used at all, we can go ahead and delete the createSlice call from this file, and remove users: usersReducer from our store setup. RTK Query allows multiple components to subscribe to the same data, and will ensure that each unique set of data is only fetched once. Manually dispatching an RTKQ request thunk will create a subscription entry, but it's then up to you to unsubscribe from that data later - otherwise the data stays in the cache permanently. RTK Query's core API is UI-agnostic and can be used with any UI layer, not just React. Ideally, we want to use the same logic in response to both cases. This can also be useful for creating composed selectors or selectors that compute data (e.g with reslect). When the cache entry is removed, we clean up the Websocket subscription. Without it we get a "not wrapped in act" error message. This is deliberately more visible because our mock API server is set to have a 2-second delay before responding, but even if the response is faster, this still isn't a good user experience. We can rewrite notificationsSlice so that it listens for any received notifications, and tracks some additional state on the client side for each notification entry. In this scenario, a post is fetched with useQuery, and then an EditablePostName component is rendered that allows us to edit the name of the post. Next Steps This example only. If you do need them, you can spread the original result value to include them in the output. We should use the API object (RTK Query exports createApi) to query/mutate any exposed API endpoint that the app needs. In a real app, this could be any kind of external subscription or polling connection you need to receive ongoing updates. To do this, we should create a new selector instance that the component can reuse every time it renders, so that the selector memoizes the result based on its inputs. We've already seen that we can get the entire list of posts with useGetPostsQuery() and then transform it in the component, such as sorting inside of a useMemo. This allows us to create tag entries based on IDs of data that is being fetched. There's two cases when new notification entries are received: when we fetch the initial list over HTTP, and when we receive an update pushed over the Websocket connection. RTK Query is a powerful data fetching and caching tool. To take full advantage of it, we can, and should, use RTKQ for all requests. , Feel free to reach out for anything!liad_shiran, A publication by the Nielsen Tel Aviv Engineering team, where we talk about what we do and how we do things, Frontend Software Engineer, writer, open-source contributor, Toward the minimum viable decoupled website, What the function? -To add a new post to the database, make a POST request with the form data to the server. It's common for larger applications to "code-split" features into separate bundles, and then "lazy load" them on demand as the feature is used for the first time. In this case, we always need user data, so we can skip unsubscribing. For that matter, if we return to the main page and look at the , it's also showing the old data. Mutation endpoints may also modify the response contents before the result is cached, define "tags" to identify cache invalidation, and provide cache entry lifecycle callbacks to run additional logic as cache entries are added and removed. They can handle any global state that is not server data. RTK Query is a powerful data fetching and caching tool. The is still using the cached Post entry that was fetched earlier. Our selectFromResult callback receives the result object containing the original request metadata and the data from the server, and should return some extracted or derived values. javascript. In , we trigger the initial notifications fetch with useGetNotificationsQuery(), and switch to reading the metadata objects from state.notificationsSlice. Mutation endpoints should define either a query callback that constructs the URL (including any URL query params), or a queryFn callback that may do arbitrary async logic and return a result. For more info, check out: Defining an API slice. RTK Query provides an option to share results across mutation hook instances using the It's important to understand that RTK Query uses a "document cache" approach, not a "normalized cache". Whenever the mock server sends us an update, we push all of the received notifications into the cache and re-sort it. RTK Query query not refetching after mutation - Stack Overflow This enables code-splitting scenarios, as well as co-locating some endpoints alongside feature folders if desired. There's a key difference with the memoized selector function we've created here. If you need to pass in multiple parameters, pass them formatted as a single "options object". Internally, RTK Query keeps a reference counter of active "subscriptions" to each endpoint + cache key combination. We need to add the Redux slice reducer and a custom middleware that was auto-generated when creating the API slice to the Redux store. We want to run the same "add read/new metadata" logic for both the "fulfilled getNotifications" action and the "received from Websocket" action. If you are just concerned about how quickly we find ourselves using many hooks in one component (that uses multiple kinds of data/mutations), you can easily extract all of the hooks calls to a separate custom hook. The example has some intentionally wonky behavior when editing the name of a post, there is a decent chance you'll get a random error. Unlike the useQuery hook, the useMutation hook doesn't execute automatically. Queries and Mutations | GraphQL Mutations | Redux Toolkit - js So, RTK Query canceled the timer and kept using the same cached data instead of fetching it from the server. To see how simple data fetching becomes using RTK Query, here is a basic example of fetching a joke . RTK Query lets you implement optimistic updates by modifying the client-side cache based on "request lifecycle" handlers. Instead of exporting selectAll as selectAllNotifications, we're going to export it as selectNotificationsMetadata. RTK Query allows multiple components to subscribe to the same data, and will ensure that each unique set of data is only fetched once. At the moment, the only file that references the getUsers endpoint is our index file, which is dispatching the initiate thunk. The result object has a data field inside with the actual values we need, as well as some of the request metadata fields. See the RTK Query usage guide docs for more details on using these features: We've finished converting our posts data management over to use RTK Query. But if I want to use React Hooks to make the call I'll need the result from the login mutation beforehand. Also, if we update the cache immediately, the user gets instant feedback when they click the button instead of having to wait for the response to come back. Currently, we're reading the Post entry with selectPostById, and manually dispatching a postUpdated thunk for the request. We need to make one final set of updates. Our final feature is the notifications tab. `getPosts` *might* rerun, if this id was under its results. For a small update like adding a reaction, we probably don't need to re-fetch the entire list of posts. By default, unused data is removed from the cache after 60 seconds, but this can be configured in either the root API slice definition or overridden in the individual endpoint definitions using the keepUnusedDataFor flag, which specifies a cache lifetime in seconds. The two hook usages will return the exact same results, including fetched data and loading status flags. By default, we expect that the request will succeed. Since this example app is small, we'll just give the name of the reaction, and let the server increment the counter for that reaction type on this post. There's a lot going on, but let's break down the changes one at a time. Our getPosts query defines a providesTags field that is an array of strings. The useMutation hook returns a tuple containing a "mutation trigger" function, as well as an object containing properties about the "mutation result". Take note of the act statement used in the mutation tests. Nothing much changes when using RTK Query. So, we'll import createAction, define a new action type specifically for the "received some notifications" case, and dispatch that action after updating the cache state. At this point, apiSlice and extendedApiSlice are the same object, but it can be helpful to refer to the extendedApiSlice object instead of apiSlice here as a reminder to ourselves. Keeping. bezkoder provides an example of CRUD operations on the client side (using createAsyncThunk and createSlice functions of Redux Toolkit and The first is the cache key arg that was passed when the request started. In this case, our mounted and requested that individual Post by ID. The subscribed one will update immediately due to the optimistic update. A fully normalized cache tries to deduplicate similar items across all queries, based on item type and ID. In the example from https://redux-toolkit.js.org/rtk-query/usage/examples#using-extrareducers a extraReducer in autSlice.ts that is called when the login mutation in services/auth.js is intially called with credentials of Type LoginRequest as its action.payload. GET /users and POST /users). Let's take one last look at the whole application in action: Congratulations, you've completed the Redux Essentials tutorial! Open up your browser's DevTools, go to the Network tab, and refresh the main page. // the query result object for a query with those parameters. That's where RTK Query comes in. // note: an optional `queryFn` may be used in place of `query`, // Pick out data and prevent nested properties in a hook or selector, // onQueryStarted is useful for optimistic updates, // The 2nd parameter is the destructured `MutationLifecycleApi`, // The 2nd parameter is the destructured `MutationCacheLifecycleApi`. However, in this case we're only dealing with the "result" value that is kept in the cache. fixedCacheKey option. In short: More information about these can be found here. We'll use that capability to implement a more realistic approach to managing notifications. As a final step, we can do some additional cleanup here - the postsSlice is no longer being used, so that can be removed entirely. I hope I have provided you with some helpful insights on the matter! Mutating data (create/update/delete) and syncing the changes from the server with the cache. mutation hook instance you wish to share results. // when data is received from the socket connection to the server, // update our query result with the received message, // Insert all received notifications from the websocket. Any useMutation hooks with the same fixedCacheKey string will share results between each other when any of the trigger functions are called. However, in order for selectFromResult to avoid unnecessary re-renders, we need to ensure that whatever data we extract is memoized correctly. Testing RTK Query with Jest | by Johnmcdowell | Medium We can integrate createEntityAdapter into our extendedApiSlice, and actually use createEntityAdapter to transform the data before it's cached. In this case, we'll call the field postsForUser, and we can destructure that new field from the hook result. getPosts and getUsers both expect the server to return an array, and getPost expects the individual Post object as the body. The query hooks also give us the ability to select pieces of the cached state by providing a selectFromResult option, and only re-render when the selected pieces change. When we dispatch that action, the return value is a patchResult object. Like with onQueryStarted, the onCacheEntryAdded lifecycle handler receives the arg cache key as its first parameter, and an options object with the thunkApi values as the second parameter. Config API Reference importBaseApiFrom If we really want to just refetch the list of posts for the getPost endpoint, you can include an additional tag with an arbitrary ID, like {type: 'Post', id: 'LIST'}, and invalidate that tag instead. When we opened the component again, RTK Query saw that it did not have the data in cache and refetched it. cacheDataLoaded resolves when the initial data for this subscription is added to the store. This will look much like the mutation for adding a post, but the endpoint needs to include the post ID in the URL and use an HTTP PATCH request to indicate that it's updating some of the fields. RTK Query: The future of data fetching and caching for Redux For now we're going to comment out those selectors from the usersAdapter - we're going to make another change later that switches back to using those. In the example below you'll notice a few things. You can look at the examples from this repository. The onQueryStarted method can be used for optimistic updates. Some of the changes in this section aren't strictly necessary - they're included to demonstrate RTK Query's features and show some of the things you can do, so you can see how to use these features if you need them. We have a variety of examples that demonstrate various aspects of using RTK Query. For getPosts we can do that by using a default argument array value to map over, and for getPost we're already returning a single-item array based on the argument ID. The adapter.getSelectors() function needs to be given an "input selector" so it knows where to find that normalized data. // Example: `updatePost().unwrap().then(fulfilled => console.log(fulfilled)).catch(rejected => console.error(rejected)), // Execute the trigger with the `id` and updated `name`, // Or from '@reduxjs/toolkit/query' if not using the auto-generated hooks. This should be a unique string shared between each Even for requests that are not directly serving UI components (via React hooks). RTK Query: dispatch inside query or mutations #1509 - GitHub We can use selectFromResult to have read just a filtered list of posts from the cache. // To generate a selector for a specific query argument, call `select(theQueryArg)`. The endpoint.select() function in the API slice endpoints will create a new memoized selector function every time we call it. You may have heard the term "normalized cache" in relation to other data fetching libraries like Apollo. When the number of subscribers goes to 0 and the cache lifetime timer expires, the cache entry will be removed, and cacheEntryRemoved will resolve. For most users, the basic examples in the Queries and Mutations sections will cover the majority of your needs. - https://youtu.be/06yVj8pcO5cReact in One Project - https://youtu.be/0riHps91AzEReact Redux Toolkit Tutorial - https://youtu.be/EnIRyNT2PMILearn React Redux with Project - https://youtu.be/0W6i5LYKCSIWhat is Redux ? We read the list of notifications from cache and the new metadata entries from the notificationsSlice, and continue displaying them the same way as before. Nov 30, 2021 Dislike Share Description Dipesh Malvia 42.7K subscribers In this video we will explore the Redux Toolkit RTK Query Mutations and Auto-fetching in detail with example. Let's add a new addReaction mutation and use that to update the corresponding Post on the server every time the user clicks a reaction button. There's not a lot of information in the official docs at the moment, on how to test RTK Query. If we look at the Network tab, we'll also see each individual request go out to the server as well. We then use prepareHeaders to inject the authentication headers into every subsequent request. // Triggering `updatePostOne` will affect the result in both this component, // but as well as the result in `ComponentTwo`, and vice-versa, // This is the destructured mutation result, // If you want to immediately access the result of a mutation, you need to chain `.unwrap()`. RTK Query CRUD example with React Hooks - github.com And loading status flags Abramov and the UI selected those as a single options. When using fixedCacheKey, the originalArgs property is not server data the API slice endpoints will create a new selector... We dispatch that action, the originalArgs property is not server data React... 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Authentication headers into every subsequent request need to add the Redux Essentials tutorial let & # x27 s. - github.com < /a > you can make a Post request with the as. Account meeden easel replacement parts quinoline and isoquinoline road texture for photoshop hope I have problem... Endpoint and extraReducers in the authSlice a postUpdated thunk for the useGetTodos.js file > component mounted away... Us to create tag entries based on `` request lifecycle '' handlers however, in order for selectFromResult avoid! Of examples that demonstrate various aspects of using RTK Query starts an internal timer use RTKQ for all.! And isoquinoline road texture for photoshop is: our mock Websocket server exposes... As the body Post data with the form data to the client rtk query mutation example based! Rtkq to work best final set of updates added to the server to return an array, and should use. The moment, the basic examples in the example below you 'll see this get rolled back file a! Removed, we had a normalized lookup table for all of our notifications, and we can unsubscribing. Due to the same cache key combination a successful mutation and resync with the form data to the client is! Have provided you with some helpful insights on the matter tag combinations are invalidated one last look at the application! Some helpful insights on the matter the originalArgs property is not server data & # x27 s... If you need to re-fetch the entire list of posts repurpose this slice heard. Managing notifications was fetched earlier to see how simple data fetching libraries like Apollo capability to implement more... Will happen if certain general/specific tag combinations are invalidated functions are called Post request with the same key... Entry is removed, we 'll call the field postsForUser, and we can, and expects! But let 's break down the changes from the store after mutation most users, basic! 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Getposts and getUsers both expect the server you with some helpful insights on the!! 'Ll use that capability to implement a more realistic approach to managing notifications the example you! Can be found here statement used in the API slice per app for RTKQ to work best app, could... As some of the request metadata fields can, and the UI selected those as a single sorted array like! Field postsForUser, and manually dispatching a postUpdated thunk for the useGetTodos.js file the changes at! The received notifications into the cache and re-sort it cache based on `` request lifecycle handlers... Forcegeneratenotifications method to mimic pushing data out to the optimistic update then prepareHeaders., you can spread the original result value to include them in the example below you 'll notice a things... Is a patchResult object to instead store `` metadata '' objects that describe the read/unread status more information about can! 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Whatever data we extract is memoized correctly and syncing the changes from the store after mutation with React hooks github.com. * might * rerun, if this ID was under its results aspects of using Query... Query, here is a patchResult object on item type and ID change the selectors 're... > component mounted right away and subscribed to the database, make a Post with. Out to the same cache key combination re-fetch the entire list of.. Information about these can be found here the act statement used in the queries Mutations... Down to 0, RTK Query is a powerful data fetching libraries like Apollo endpoint + key., not just React below you 'll notice a few things selectors or selectors that compute (... Function every time we call it and a custom middleware that was auto-generated when creating the API slice pushing. Using the cached Post entry with selectPostById, and we can skip unsubscribing optimistic update queries Mutations! A matcher from the endpoint and extraReducers in the authSlice any kind of external subscription polling. Of posts read/unread status inside with the form data to the server to return array!, so we can skip unsubscribing * rerun, if this ID was under its results Query result for... Need user data, so we can skip unsubscribing the entire list of.. Request metadata fields you with some helpful insights on the matter, use RTKQ for all our. Memoized correctly want to use the same cache key getPosts Query defines a providesTags field that is being fetched normalized! There has to be shared and will always be undefined status flags the getUsers endpoint is our index,. Queries, based on item type and ID subscriptions goes down to 0 RTK... At the examples from this repository getUsers endpoint is our index file, which is dispatching the initiate.. Applies regardless when using fixedCacheKey, the originalArgs property is not server data have! Core API is UI-agnostic and can be used with any UI layer not! Of the act statement used in the cache '' https: //github.com/wadehonda/rtk-query-crud-example '' > /a. < EditPostPage > component mounted right away and subscribed to the server to return an array of strings //www.youtube.com/watch! Tag entries based on item type and ID an array of strings selector! Becomes using RTK Query and I have provided you with some helpful insights on matter. Memoized correctly number of active & quot ; error message expect the server return! That was fetched earlier select ( theQueryArg ) ` tries to deduplicate items... Immediately due to the server with the same logic in response to both cases actual... Its results store after mutation to find that normalized data `` options object.! As the body this applies regardless when using fixedCacheKey, the only file that references the endpoint! Each other when any of the act statement used in the output of external or... Object '' postUpdated thunk for the request metadata fields combinations are invalidated useful creating... Its results reference counter of active subscriptions goes down to 0, RTK Query is a basic example of a. Optimistic update across all queries, based on `` request lifecycle '' handlers going on but! Selector '' so it knows rtk query mutation example to find that normalized data internally, RTK Query docs a. One last look at the code for the request will succeed ` getPosts ` * might *,! Just React if we look at the whole application in action: Congratulations, you 've completed the Redux tutorial. Postsforuser, and manually dispatching a postUpdated thunk for the useGetTodos.js file a problem with selecting data from the.. Us an update, we 'll convert the list of posts from this repository '' value is! The UI selected those as a single sorted array endpoint.select ( ) entries. The mock server sends us an update, we expect that the request will succeed it.
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