How to Optionally Turn Off Apollo Caching?

To optionally turn off Apollo caching, you can set the fetchPolicy option to network-only when making a query or mutation. This will force Apollo to always make a network request and not use any cached data for that specific operation. Additionally, you can also disable caching for specific queries or mutations by setting the shouldWatch option to false in the Apollo Client cache configuration. Lastly, you can completely disable caching for all operations by setting the defaultOptions option in the Apollo Client constructor to { watchQuery: { fetchPolicy: 'network-only' }, query: { fetchPolicy: 'network-only' }, mutate: { fetchPolicy: 'network-only' }}.

What are the benefits of Apollo caching?

1. Improved performance: Caching can significantly reduce the load time of a website or application by storing data or responses locally for quicker access.
2. Reduced latency: With cached data readily available, users can experience reduced latency as server calls are minimized, resulting in faster response times.
3. Bandwidth optimization: Apollo caching can help optimize bandwidth usage by reducing the need for repeated data requests from the server, especially for large datasets.
4. Offline support: Caching allows users to access previously loaded data even when they are offline, ensuring a seamless and uninterrupted user experience.
5. Scalability: Caching helps improve the scalability of an application by reducing the load on servers and improving overall performance, making it easier to handle a large number of users simultaneously.
6. Cost savings: By reducing the number of server calls and optimizing data retrieval, caching can help lower infrastructure costs associated with data transfer and processing.
7. Customizable caching strategies: Apollo caching allows developers to implement customizable caching strategies to meet specific requirements, ensuring optimal performance and user experience.

How to disable cache updates in Apollo GraphQL?

To disable cache updates in Apollo GraphQL, you can use the 'no-cache' fetch policy option when querying data. This will prevent the cache from being updated with the response data.

Here's an example of how you can disable cache updates in Apollo GraphQL:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25

import { useQuery } from '@apollo/react-hooks';
import { gql } from 'apollo-boost';

const GET_DATA = gql`
  query GetData {
    data {
      // Query data fields here
    }
  }
`;

const MyComponent = () => {
  const { loading, error, data } = useQuery(GET_DATA, {
    fetchPolicy: 'no-cache',  // Disable cache updates
  });

  if (loading) return 'Loading...';
  if (error) return `Error! ${error.message}`;

  return (
    // Render your component with the data here
  );
};

export default MyComponent;

By setting the fetch policy to 'no-cache', Apollo will not update the cache with the response data and will always fetch fresh data from the server. This can be useful in scenarios where you want to make sure you always have the most up-to-date data or if you want to avoid caching certain queries.

How to force clear cache in Apollo Client?

To force clear the cache in Apollo Client, you can use the resetStore method that is available in the default Apollo Client instance. Here's how you can do it:

1. Import the Apollo Client library:

1

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

1. Get the default Apollo Client instance:

1
2
3

const client = new ApolloClient({
  // Your Apollo Client configuration
});

1. Call the resetStore method on the client instance:

1

client.resetStore();

This will clear the cache and refetch any data that is needed from the server.

How to configure Apollo cache options?

To configure Apollo cache options, you can use the InMemoryCache constructor and pass in an object with your desired configuration options. Here are some common options you can set:

1. typePolicies: This option allows you to define custom merge functions for specific types in your GraphQL schema. You can specify how items of a specific type should be merged in the cache when they are updated.

1
2
3
4
5
6
7

const cache = new InMemoryCache({
  typePolicies: {
    Post: {
      keyFields: ['id'],
    },
  },
});

1. dataIdFromObject: This option allows you to specify how Apollo should generate unique identifiers for cached objects. By default, Apollo uses the id field if it exists, but you can customize this behavior with a function.

1
2
3

const cache = new InMemoryCache({
  dataIdFromObject: object => `${object.__typename}:${object.id}`,
});

1. addTypename: This option determines whether to automatically add the __typename field to each object in the cache. This is useful for handling nested objects correctly when performing cache updates.

1
2
3

const cache = new InMemoryCache({
  addTypename: true,
});

1. resultCaching: This option determines whether Apollo should cache the results of queries in the cache. By default, this is enabled to improve performance, but you can disable it if you need to re-fetch data every time a query is made.

1
2
3

const cache = new InMemoryCache({
  resultCaching: true,
});

These are just a few of the options you can configure when working with Apollo cache. You can find more options and detailed information in the Apollo Client documentation.