TanStack Query Hook - 🌲 Sonamu

Learn how to efficiently manage data in React with type safety using Sonamu’s auto-generated TanStack Query Hooks.

Sonamu + TanStack Query Overview

Auto-generated

useUser, usePost Hooks No code writing needed

Type Safe

Service types preserved Complete type chain

Auto Caching

Memory cache Duplicate request removal

Auto Revalidation

Refresh on focus Periodic polling

Using TanStack Query Hooks in Sonamu

Hook Auto-generation

Sonamu auto-generates TanStack Query Hooks for each Service function. Generated Hooks (services.generated.ts):

import { useQuery, queryOptions } from "@tanstack/react-query";
import qs from "qs";

export namespace UserService {
  // 1. Regular function
  export async function getUser<T extends UserSubsetKey>(
    subset: T,
    id: number,
  ): Promise<UserSubsetMapping[T]> {
    return fetch({
      method: "GET",
      url: `/api/user/findById?${qs.stringify({ subset, id })}`,
    });
  }

  // 2. Query Options (reusable)
  export const getUserQueryOptions = <T extends UserSubsetKey>(subset: T, id: number) =>
    queryOptions({
      queryKey: ["User", "getUser", subset, id],
      queryFn: () => getUser(subset, id),
    });

  // 3. React Hook (auto-generated)
  export const useUser = <T extends UserSubsetKey>(
    subset: T,
    id: number,
    options?: { enabled?: boolean },
  ) =>
    useQuery({
      ...getUserQueryOptions(subset, id),
      ...options,
    });
}

Generation rules:

Function name: get{Entity} → Hook name: use{Entity}
Query Key: ["{Entity}", "{methodName}", ...params]
Types fully preserved (Subset support)

Basic Usage

useUser Hook

The most basic data fetching Hook.

import { UserService } from "@/services/services.generated";

function UserProfile({ userId }: { userId: number }) {
  // Use auto-generated Hook
  const { data, error, isLoading } = UserService.useUser("A", userId);

  if (isLoading) return <div>Loading...</div>;
  if (error) return <div>Error: {error.message}</div>;
  if (!data) return <div>User not found</div>;

  return (
    <div>
      <h1>{data.username}</h1>
      <p>{data.email}</p>
    </div>
  );
}

Features:

data is of type UserSubsetMapping["A"] | undefined
Auto caching: Uses cache when called with same userId again
Auto revalidation: Auto refresh on focus, reconnection
Deduplication: Even if multiple components call simultaneously, API is called only once

Subset and Type Safety

Accurate types are returned according to Subset.

function UserProfile({ userId }: { userId: number }) {
  // Subset "A": Basic info
  const { data: basicUser } = UserService.useUser("A", userId);
  console.log(basicUser?.id); // ✅ OK
  console.log(basicUser?.username); // ✅ OK
  console.log(basicUser?.bio); // ❌ Compile error (not in Subset A)

  // Subset "B": Including bio
  const { data: userWithBio } = UserService.useUser("B", userId);
  console.log(userWithBio?.bio); // ✅ OK

  // Subset "C": All fields
  const { data: fullUser } = UserService.useUser("C", userId);
  console.log(fullUser?.createdAt); // ✅ OK
}

Type chain:

Backend Entity
  → Subset Mapping
  → Service Function
  → TanStack Query Hook
  → React Component

Types are preserved at every step!

Advanced Usage

Conditional Fetching

Fetch data only under certain conditions.

function UserProfile({ userId }: { userId: number | null }) {
  const { data, isLoading } = UserService.useUser(
    "A",
    userId!,
    { enabled: userId !== null } // Don't call if userId is null
  );

  if (!userId) return <div>Please select a user</div>;
  if (isLoading) return <div>Loading...</div>;
  if (!data) return <div>User not found</div>;

  return <div>{data.username}</div>;
}

enabled option:

true: Load data immediately (default)
false: Don’t load data
Use cases: Login status, parameter existence, etc.

Dependent Fetching

Use previous data for the next request.

function UserDashboard({ userId }: { userId: number }) {
  // Step 1: User info
  const { data: user } = UserService.useUser("A", userId);

  // Step 2: User's posts (only when user exists)
  const { data: posts } = PostService.usePosts(
    "A",
    user ? user.id : 0,
    { enabled: !!user } // Only call when user exists
  );

  return (
    <div>
      <h1>{user?.username}</h1>
      <div>Posts: {posts?.length || 0}</div>
    </div>
  );
}

Query Options Reuse

Reuse the same Query Options in multiple places.

import { UserService } from "@/services/services.generated";
import { useQueryClient } from "@tanstack/react-query";

function UserProfile({ userId }: { userId: number }) {
  const queryClient = useQueryClient();

  // Reuse options
  const queryOptions = UserService.getUserQueryOptions("A", userId);

  // 1. Use in Hook
  const { data } = useQuery(queryOptions);

  // 2. Manual refetch
  function handleRefresh() {
    queryClient.invalidateQueries(queryOptions);
  }

  // 3. Prefetch
  function handleMouseEnter() {
    queryClient.prefetchQuery(queryOptions);
  }

  return <div onMouseEnter={handleMouseEnter}>{data?.username}</div>;
}

Mutation (Data Changes)

Create/Update/Delete with useMutation

Change data with TanStack Query’s useMutation.

import { useMutation, useQueryClient } from "@tanstack/react-query";
import { UserService } from "@/services/services.generated";

function EditProfile({ userId }: { userId: number }) {
  const queryClient = useQueryClient();

  // Define Mutation
  const updateMutation = useMutation({
    mutationFn: (data: { username?: string; bio?: string }) =>
      UserService.updateProfile(data),
    onSuccess: () => {
      // Invalidate User query on success
      queryClient.invalidateQueries({
        queryKey: ["User"],
      });
    },
  });

  async function handleSubmit(data: { username: string; bio: string }) {
    await updateMutation.mutateAsync(data);
    alert("Updated!");
  }

  return (
    <form onSubmit={(e) => {
      e.preventDefault();
      handleSubmit({/* data */});
    }}>
      <input name="username" />
      <textarea name="bio" />
      <button type="submit" disabled={updateMutation.isPending}>
        {updateMutation.isPending ? "Saving..." : "Save"}
      </button>
    </form>
  );
}

Optimistic Updates

Update UI immediately without waiting for API response.

function EditProfile({ userId }: { userId: number }) {
  const queryClient = useQueryClient();

  const updateMutation = useMutation({
    mutationFn: (data: { username: string }) =>
      UserService.updateProfile(data),

    // 1. Before Mutation starts (optimistic update)
    onMutate: async (newData) => {
      // Cancel ongoing queries
      await queryClient.cancelQueries(
        UserService.getUserQueryOptions("A", userId)
      );

      // Backup previous data
      const previousUser = queryClient.getQueryData(
        UserService.getUserQueryOptions("A", userId).queryKey
      );

      // Optimistically update cache
      queryClient.setQueryData(
        UserService.getUserQueryOptions("A", userId).queryKey,
        (old: any) => ({ ...old, username: newData.username })
      );

      return { previousUser };
    },

    // 2. On success
    onSuccess: () => {
      queryClient.invalidateQueries({
        queryKey: ["User"],
      });
    },

    // 3. On failure (rollback)
    onError: (err, newData, context) => {
      queryClient.setQueryData(
        UserService.getUserQueryOptions("A", userId).queryKey,
        context?.previousUser
      );
    },
  });

  return (
    <button onClick={() => updateMutation.mutate({ username: "newname" })}>
      Update Username
    </button>
  );
}

User experience:

Button click → UI updates immediately (no waiting)
API call in background
Confirmed with server data on success
Auto rollback on failure

Cache Management

Cache Invalidation

Invalidate cache of specific queries to reload.

import { useQueryClient } from "@tanstack/react-query";
import { UserService } from "@/services/services.generated";

function SomeComponent({ userId }: { userId: number }) {
  const queryClient = useQueryClient();

  function handleUpdate() {
    // 1. Invalidate only specific User query
    queryClient.invalidateQueries(UserService.getUserQueryOptions("A", userId));

    // 2. Invalidate all User queries
    queryClient.invalidateQueries({
      queryKey: ["User"],
    });

    // 3. Invalidate all queries of specific method
    queryClient.invalidateQueries({
      queryKey: ["User", "getUser"],
    });
  }
}

Direct Cache Modification

Modify cache directly without API call.

function LikeButton({ postId }: { postId: number }) {
  const queryClient = useQueryClient();

  function handleLike() {
    // Modify cache directly
    queryClient.setQueryData(
      PostService.getPostQueryOptions("A", postId).queryKey,
      (old: any) => ({
        ...old,
        likes: old.likes + 1,
        isLiked: true,
      })
    );

    // Call API in background
    PostService.likePost(postId);
  }

  return <button onClick={handleLike}>Like</button>;
}

Prefetching

Preload data to improve user experience.

function UserList({ userIds }: { userIds: number[] }) {
  const queryClient = useQueryClient();

  // Preload on hover
  function handleMouseEnter(userId: number) {
    queryClient.prefetchQuery(
      UserService.getUserQueryOptions("A", userId)
    );
  }

  return (
    <ul>
      {userIds.map((id) => (
        <li
          key={id}
          onMouseEnter={() => handleMouseEnter(id)}
        >
          <Link to={`/users/${id}`}>User {id}</Link>
        </li>
      ))}
    </ul>
  );
}

Practical Examples

Infinite Scroll

Implement infinite scroll instead of pagination.

import { useInfiniteQuery } from "@tanstack/react-query";
import { PostService } from "@/services/services.generated";

function PostList() {
  const {
    data,
    fetchNextPage,
    hasNextPage,
    isFetchingNextPage,
    isLoading,
  } = useInfiniteQuery({
    queryKey: ["Post", "list"],
    queryFn: ({ pageParam = 1 }) =>
      PostService.getPosts("A", { page: pageParam, pageSize: 20 }),
    getNextPageParam: (lastPage, pages) => {
      return lastPage.length === 20 ? pages.length + 1 : undefined;
    },
    initialPageParam: 1,
  });

  // Flatten posts from all pages
  const posts = data?.pages.flat() || [];

  return (
    <div>
      {posts.map((post) => (
        <div key={post.id}>{post.title}</div>
      ))}

      {hasNextPage && (
        <button onClick={() => fetchNextPage()} disabled={isFetchingNextPage}>
          {isFetchingNextPage ? "Loading..." : "Load More"}
        </button>
      )}
    </div>
  );
}

Real-time Polling

Refresh data periodically.

function RealtimeFeed() {
  const { data } = FeedService.useLatest(
    "A",
    {},
    {
      refetchInterval: 3000, // Refresh every 3 seconds
      refetchIntervalInBackground: false, // Don't refresh in background
    }
  );

  return (
    <div>
      {data?.items.map((item) => (
        <div key={item.id}>{item.content}</div>
      ))}
    </div>
  );
}

Combining Multiple Hooks

function UserDashboard({ userId }: { userId: number }) {
  // Load multiple data in parallel
  const userQuery = UserService.useUser("A", userId);
  const postsQuery = PostService.usePostsByUser("A", userId);
  const statsQuery = UserService.useStats(userId);

  // Wait until all queries are loaded
  if (userQuery.isLoading || postsQuery.isLoading || statsQuery.isLoading) {
    return <div>Loading...</div>;
  }

  // Show error if any has error
  if (userQuery.error || postsQuery.error || statsQuery.error) {
    return <div>Error loading data</div>;
  }

  return (
    <div>
      <h1>{userQuery.data?.username}</h1>
      <div>Posts: {postsQuery.data?.length}</div>
      <div>Views: {statsQuery.data?.totalViews}</div>
    </div>
  );
}

TanStack Query Configuration

Global Configuration

// app/providers.tsx
import { QueryClient, QueryClientProvider } from "@tanstack/react-query";

const queryClient = new QueryClient({
  defaultOptions: {
    queries: {
      // Time until data is considered stale (5 seconds)
      staleTime: 5000,

      // Revalidate on focus
      refetchOnWindowFocus: true,

      // Revalidate on reconnect
      refetchOnReconnect: true,

      // Error retry
      retry: 1,

      // Unused data cache retention time (5 minutes)
      gcTime: 5 * 60 * 1000,
    },
  },
});

export function Providers({ children }: { children: React.ReactNode }) {
  return (
    <QueryClientProvider client={queryClient}>
      {children}
    </QueryClientProvider>
  );
}

DevTools

Visually check cache state during development.

import { ReactQueryDevtools } from "@tanstack/react-query-devtools";

export function Providers({ children }: { children: React.ReactNode }) {
  return (
    <QueryClientProvider client={queryClient}>
      {children}
      <ReactQueryDevtools initialIsOpen={false} />
    </QueryClientProvider>
  );
}

Performance Optimization

Optimization with Subset

Choose appropriate Subset for the situation to reduce network cost:

// List view: Only minimum info
const { data: users } = UserService.useUsers("A");

// Detail view: All info
const { data: user } = UserService.useUser("C", userId);

Selective Revalidation

Prevent unnecessary revalidation:

// Data that doesn't change often
const { data } = UserService.useUser("A", userId, {
  staleTime: Infinity, // Fresh forever
  refetchOnWindowFocus: false,
  refetchOnReconnect: false,
});

Parallel Requests

Load multiple data simultaneously:

function Dashboard({ userId }: { userId: number }) {
  // All Hooks execute in parallel
  const { data: user } = UserService.useUser("A", userId);
  const { data: posts } = PostService.usePosts("A", { userId });
  const { data: stats } = StatsService.useUserStats(userId);

  // All three requests execute simultaneously for speed!
}

Cautions

Cautions when using TanStack Query Hooks: 1. Hooks should only be called inside components (React rules) 2. Subset parameter required: useUser("A", userId) 3. Implement conditional fetching with enabled: false 4. Cache invalidation required on Mutation success 5. Query Key is auto-generated so don’t write manually 6. Never modify generated Hooks (overwritten on regeneration) 7. Wrap entire app with QueryClientProvider

Next Steps

How Services Work

Understanding auto-generation

Using Services

Basic Service usage

TanStack Query Docs

Learn more about TanStack Query

Subset System

Subset system

Get Started

Core Concepts

Database

API Development

Frontend Integration

Testing

Advanced Features

Tools & CLI

Configuration

API Reference

Troubleshooting

FAQ

​Sonamu + TanStack Query Overview

Auto-generated

Type Safe

Auto Caching

Auto Revalidation

​Using TanStack Query Hooks in Sonamu

​Hook Auto-generation

​Basic Usage

​useUser Hook

​Subset and Type Safety

​Advanced Usage

​Conditional Fetching

​Dependent Fetching

​Query Options Reuse

​Mutation (Data Changes)

​Create/Update/Delete with useMutation

​Optimistic Updates

​Cache Management

​Cache Invalidation

​Direct Cache Modification

​Prefetching

​Practical Examples

​Infinite Scroll

​Real-time Polling

​Combining Multiple Hooks

​TanStack Query Configuration

​Global Configuration

​DevTools

​Performance Optimization

​Optimization with Subset

​Selective Revalidation

​Parallel Requests

​Cautions

​Next Steps

How Services Work

Using Services

TanStack Query Docs

Subset System

Sonamu + TanStack Query Overview

Using TanStack Query Hooks in Sonamu

Hook Auto-generation

Basic Usage

useUser Hook

Subset and Type Safety

Advanced Usage

Conditional Fetching

Dependent Fetching

Query Options Reuse

Mutation (Data Changes)

Create/Update/Delete with useMutation

Optimistic Updates

Cache Management

Cache Invalidation

Direct Cache Modification

Prefetching

Practical Examples

Infinite Scroll

Real-time Polling

Combining Multiple Hooks

TanStack Query Configuration

Global Configuration

DevTools

Performance Optimization

Optimization with Subset

Selective Revalidation

Parallel Requests

Cautions

Next Steps