How to handle dynamic variables in useQuery?

Explanation of the problem

The issue at hand pertains to understanding how to automatically refetch data when variables change in a React application utilizing the useQuery hook. The user is seeking a mechanism where, upon modifying the variables used in the useQuery hook, the data is refetched, triggering a re-render of the component. However, the current implementation only fetches the data once and does not perform subsequent fetches when the variables are updated. The user is unsure if they have misunderstood the functionality or if there is a missing piece in their code. They have provided a code snippet demonstrating their attempt at achieving the desired behavior.

function foo() {
  const [variables, setVariables] = useState({});
  const { data, loading } = useQuery(SOME_GRAPHQL_SCHEMA, {
    variables,
    suspend: false,
  });

  if(loading) return <p>Loading</p>;
  console.log(data, variables);
  return (...);
}

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Problem solution for How to handle dynamic variables in useQuery?

Other popular problems with saikat react-apollo-starter-kit

const MyComponent = ({data: {loading, error, myData}}) => {
  if (loading) return <Loading />;
  if (error) return <Error error={error} />;
  return (
    <div>
      {myData.map(data => (
        <div key={data.id}>{data.name}</div>
      ))}
    </div>
  );
};

Problem: “Network error: Network request failed” when trying to make a query or mutation

This error occurs when there is a problem with the network connection between the client and the server. This can be caused by an issue with the server, an issue with the client’s network connection or a problem with the URL of the GraphQL endpoint.

Solution:

The solution is to check the network connection and ensure that the client can reach the server. Additionally, check the URL of the GraphQL endpoint and ensure that it is correct and that the server is running. Here is an example of how to set the endpoint URL in the client:

const client = new ApolloClient({
  uri: 'https://api.my-server.com/graphql',
});

Problem:”Error: GraphQL error: Variable “$variableName” of type “Type” used in position expecting type “OtherType”.” when trying to make a query or mutation with variables:

This error occurs when the type of a variable passed to a query or mutation does not match the type that is expected by the server. This can happen if the variable is of the wrong type or if the variable is missing. The solution is to check the types of thevariables being passed to the query or mutation and ensure that they match the expected types on the server. Additionally, check that all the required variables are being passed and that they are not undefined. Here is an example of how to pass variables to a query:

const MY_QUERY = gql`
  query MyQuery($id: ID!) {
    myData(id: $id) {
      name
    }
  }
`;

const variables = {
  id: 'abc123',
};

const { data, loading, error } = useQuery(MY_QUERY, { variables });

In the above example, the variable “id” is of type “ID!” and it is being passed as an argument to the query “MyQuery” .It’s important to make sure that the type of the variable passed match the expected type on the server.

A brief introduction to saikat react-apollo-starter-kit

React-Apollo is a library that allows you to easily integrate your React application with the Apollo Client. It is built on top of the Apollo Client and provides a set of higher-order components (HOCs) and hooks that make it easy to fetch and manage data in your React components.

React-Apollo’s HOCs, such as graphql and withApollo, allow you to declaratively fetch data from your GraphQL server and automatically update your components when the data changes. The library also provides a set of hooks, such as useQuery and useMutation, which allows you to fetch and mutate data in a functional component. Additionally, React-Apollo provides a ApolloProvider component that makes it easy to configure your Apollo Client and provides access to the client throughout your application.

Most popular use cases for saikat react-apollo-starter-kit

const [createTodo] = useMutation(CREATE_TODO_MUTATION);
const handleSubmit = (event) => {
    event.preventDefault();
    createTodo({ variables: { text } });
}

3. Centralized management of the Apollo Client: React-Apollo provides a ApolloProvider component that makes it easy to configure your Apollo Client and provides access to the client throughout your application. This means that you can configure your client once and use it throughout your application, rather than having to pass it down through multiple components.

import { ApolloClient, InMemoryCache } from '@apollo/client';

const client = new ApolloClient({
  uri: 'https://your-graphql-server.com/graphql',
  cache: new InMemoryCache()
});

ReactDOM.render(
  <ApolloProvider client={client}>
    <App />
  </ApolloProvider>,
  document.getElementById('root')
);