usage.mdx

title	Usage
description	Usage of OpenAPI React Query Codegen.

After generating the React Query hooks and functions, you can start using them in your React application.

Using the generated useQuery hooks

import { useFindPets } from "../openapi/queries";
function App() {
  const { data } = useFindPets();

  return (
    <div className="App">
      <h1>Pet List</h1>
      <ul>{data?.map((pet) => <li key={pet.id}>{pet.name}</li>)}</ul>
    </div>
  );
}

export default App;

Optionally, you can also use the pure TypeScript client to customize your query. The SDK functions are defined in openapi/requests/sdk.gen.ts and are also available via the backward-compatible openapi/requests/services.gen.ts shim.

import { useQuery } from "@tanstack/react-query";
import { findPets } from "../openapi/requests/services.gen";
import { useFindPetsKey } from "../openapi/queries";

function App() {
  // You can still use the auto-generated query key
  const { data } = useQuery({
    queryKey: [useFindPetsKey],
    queryFn: () => {
      // Do something here
      return findPets();
    },
  });

  return <div className="App">{/* .... */}</div>;
}

export default App;

Using the generated useQuerySuspense hooks

import { useFindPetsSuspense } from "../openapi/queries/suspense";
function ChildComponent() {
  const { data } = useFindPetsSuspense({
    query: { tags: [], limit: 10 },
  });

  return <ul>{data?.map((pet, index) => <li key={pet.id}>{pet.name}</li>)}</ul>;
}

function ParentComponent() {
  return (
    <>
      <Suspense fallback={<>loading...</>}>
        <ChildComponent />
      </Suspense>
    </>
  );
}

function App() {
  return (
    <div className="App">
      <h1>Pet List</h1>
      <ParentComponent />
    </div>
  );
}

export default App;

Using the generated useMutation hooks

import { useAddPet } from "../openapi/queries";

function App() {
  const { mutate } = useAddPet();

  const handleAddPet = () => {
    mutate({ body: { name: "Fluffy" } });
  };

  return (
    <div className="App">
      <h1>Add Pet</h1>
      <button onClick={handleAddPet}>Add Pet</button>
    </div>
  );
}

export default App;

Invalidating queries after a mutation is important to ensure the cache is updated with the new data. This is done by calling the queryClient.invalidateQueries function with the query key used by the query hook.

Learn more about invalidating queries here.

To ensure the query key is created the same way as the query hook, you can use the query key function exported by the generated query hooks.

import {
  useFindPetsByStatus,
  useAddPet,
  UseFindPetsByStatusKeyFn,
} from "../openapi/queries";

function App() {
  const [status, setStatus] = React.useState(["available"]);
  const { data } = useFindPetsByStatus({ query: { status } });
  const { mutate } = useAddPet({
    onSuccess: () => {
      queryClient.invalidateQueries({
        // Call the query key function to get the query key
        // This is important to ensure the query key is created the same way as the query hook
        // This insures the cache is invalidated correctly and is typed correctly
        queryKey: [UseFindPetsByStatusKeyFn({
          status
        })],
      });
    },
  });

  return (
    <div className="App">
      <h1>Pet List</h1>
      <ul>{data?.map((pet) => <li key={pet.id}>{pet.name}</li>)}</ul>
      <button
        onClick={() => {
          mutate({ name: "Fluffy", status: "available" });
        }}
      >
        Add Pet
      </button>
    </div>
  );
}

export default App;

Using the generated useInfiniteQuery hooks

This feature will generate a function in infiniteQueries.ts when the name specified by the pageParam option exists in the query parameters and the name specified by the nextPageParam option exists in the response.

The initialPageParam option can be specified to set the intial page to load, defaults to 1. The nextPageParam supports dot notation for nested values (i.e. meta.next).

Example Schema:

paths:
  /paginated-pets:
    get:
      description: |
        Returns paginated pets from the system that the user has access to
      operationId: findPaginatedPets
      parameters:
        - name: page
          in: query
          description: page number
          required: false
          schema:
            type: integer
            format: int32
        - name: tags
          in: query
          description: tags to filter by
          required: false
          style: form
          schema:
            type: array
            items:
              type: string
        - name: limit
          in: query
          description: maximum number of results to return
          required: false
          schema:
            type: integer
            format: int32
      responses:
        '200':
          description: pet response
          content:
            application/json:
              schema:
                type: object
                properties:
                  pets:
                    type: array
                    items:
                      $ref: '#/components/schemas/Pet'
                  nextPage: 
                    type: integer
                    format: int32
                    minimum: 1

Usage of Generated Hooks:

import { useFindPaginatedPetsInfinite } from "@/openapi/queries/infiniteQueries";

const { data, fetchNextPage } = useFindPaginatedPetsInfinite({
  query: { tags: [], limit: 10 }
});