/ Json

Use Apollo Client as React hooks

Use Apollo Client as React hooks

react-apollo-hooks

Use Apollo Client as React hooks.

Installation

npm install react-apollo-hooks

API

ApolloProvider

Similar to
ApolloProvider from react-apollo.
Both packages can be used together, if you want to try out using hooks and
retain Query, Mutation, Subscription, etc. HOCs from react-apollo
without having to rewrite existing components throughout your app.

In order for this package to work, you need to wrap your component tree with
ApolloProvider at an appropriate level, encapsulating all components which
will use hooks.

Standalone usage

If you would like to use this package standalone, this can be done with:

import React from 'react';
import { render } from 'react-dom';

import { ApolloProvider } from 'react-apollo-hooks';

const client = ... // create Apollo client

const App = () => (
  <ApolloProvider client={client}>
    <MyRootComponent />
  </ApolloProvider>
);

render(<App />, document.getElementById('root'));

Usage with react-apollo

To use with react-apollo's ApolloProvider already present in your project:

import React from 'react';
import { render } from 'react-dom';

import { ApolloProvider } from 'react-apollo';
import { ApolloProvider as ApolloHooksProvider } from 'react-apollo-hooks';

const client = ... // create Apollo client

const App = () => (
  <ApolloProvider client={client}>
    <ApolloHooksProvider client={client}>
      <MyRootComponent />
   </ApolloHooksProvider>
  </ApolloProvider>
);

render(<App />, document.getElementById('root'));

useQuery

import gql from 'graphql-tag';
import { useQuery } from 'react-apollo-hooks';

const GET_DOGS = gql`
  {
    dogs {
      id
      breed
    }
  }
`;

const Dogs = () => {
  const { data, error, loading } = useQuery(GET_DOGS);
  if (loading) {
    return <div>Loading...</div>;
  };
  if (error) {
    return `Error! ${error.message}`;
  };

  return (
    <ul>
      {data.dogs.map(dog => (
        <li key={dog.id}>{dog.breed}</li>
      ))}
    </ul>
  );
};

Usage with Suspense (experimental)

You can use useQuery with React Suspense
with the { suspend: true } option.
Please note that it's not yet recommended to use it in production. Please look
at the issue #69
for details.

Example usage:

import gql from 'graphql-tag';
import React, { Suspense } from 'react';
import { useQuery } from 'react-apollo-hooks';

const GET_DOGS = gql`
  {
    dogs {
      id
      breed
    }
  }
`;

const Dogs = () => {
  const { data, error } = useQuery(GET_DOGS, { suspend: true });
  if (error) {
    return `Error! ${error.message}`;
  }

  return (
    <ul>
      {data.dogs.map(dog => (
        <li key={dog.id}>{dog.breed}</li>
      ))}
    </ul>
  );
};

const MyComponent = () => (
  <Suspense fallback={<div>Loading...</div>}>
    <Dogs />
  </Suspense>
);

There are known issues with suspense mode for useQuery:

  • only the cache-first fetch policy is supported (#13)
  • networkStatus returned by useQuery is undefined (#68)

useMutation

import gql from 'graphql-tag';
import { useMutation } from 'react-apollo-hooks';

const TOGGLE_LIKED_PHOTO = gql`
  mutation toggleLikedPhoto($id: String!) {
    toggleLikedPhoto(id: $id) @client
  }
`;

const DogWithLikes = ({ url, imageId, isLiked }) => {
  const toggleLike = useMutation(TOGGLE_LIKED_PHOTO, {
    variables: { id: imageId },
  });
  return (
    <div>
      <img src={url} />
      <button onClick={toggleLike}>{isLiked ? 'Stop liking' : 'like'}</button>
    </div>
  );
};

You can provide any
mutation options
as an argument to the useMutation hook or to the function returned by it, e.
g.:

function AddTaskForm() {
  const inputRef = useRef();
  const addTask = useMutation(ADD_TASK_MUTATION, {
    update: (proxy, mutationResult) => {
      /* your custom update logic */
    },
    variables: {
      text: inputRef.current.value,
    },
  });

  return (
    <form>
      <input ref={inputRef} />
      <button onClick={addTask}>Add task</button>
    </form>
  );
}

Or:

function TasksWithMutation() {
  const toggleTask = useMutation(TOGGLE_TASK_MUTATION);

  return (
    <TaskList
      onChange={task => toggleTask({ variables: { taskId: task.id } })}
      tasks={data.tasks}
    />
  );
}

useApolloClient

const MyComponent = () => {
  const client = useApolloClient();
  // now you have access to the Apollo client
};

Testing

An example showing how to test components using react-apollo-hooks:
https://github.com/trojanowski/react-apollo-hooks-sample-test

Server-side rendering

react-apollo-hooks supports server-side rendering with the getMarkupFromTree
function. Example usage:

import express from 'express';
import { ApolloProvider, getMarkupFromTree } from 'react-apollo-hooks';
import { renderToString } from 'react-dom/server';

const HELLO_QUERY = gql`
  query HelloQuery {
    hello
  }
`;

function Hello() {
  const { data } = useQuery(HELLO_QUERY);

  return <p>{data.message}</p>;
}

const app = express();

app.get('/', async (req, res) => {
  const client = createYourApolloClient();
  const renderedHtml = await getMarkupFromTree({
    renderFunction: renderToString,
    tree: (
      <ApolloProvider client={client}>
        <Hello />
      </ApolloProvider>
    ),
  });
  res.send(renderedHtml);
});

getMarkupFromTree supports useQuery hooks invoked in both suspense
and non-suspense mode, but the React.Suspense
component is not supported. You can use unstable_SuspenseSSR provided
by this library instead:

import { unstable_SuspenseSSR as UnstableSuspenseSSR } from 'react-apollo-hooks';

function MyComponent() {
  return (
    <UnstableSuspenseSSR fallback={<Spinner />}>
      <div>
        <ComponentWithGraphqlQuery />
      </div>
    </UnstableSuspenseSSR>
  );
}

GitHub