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apollo-cache-inmemory
Advanced tools
The `apollo-cache-inmemory` package is a core component of Apollo Client, which is used for managing and caching GraphQL data in the client-side application. It provides an in-memory cache implementation that allows for efficient data retrieval and storage, enabling features like query result caching, cache normalization, and cache persistence.
Creating an InMemoryCache
This feature allows you to create an instance of `InMemoryCache`, which is the main cache implementation provided by the package. This cache can be used to store and retrieve GraphQL query results.
const { InMemoryCache } = require('apollo-cache-inmemory');
const cache = new InMemoryCache();
Configuring Cache Policies
This feature allows you to configure cache policies, such as merge functions, to control how data is merged into the cache. This is useful for handling pagination and other complex data structures.
const cache = new InMemoryCache({
typePolicies: {
Query: {
fields: {
myField: {
merge(existing, incoming) {
return { ...existing, ...incoming };
}
}
}
}
}
});
Reading and Writing to the Cache
This feature allows you to read from and write to the cache directly using GraphQL queries. This is useful for updating the cache after performing local state updates or other client-side operations.
const { gql } = require('apollo-boost');
const query = gql`{ myField }`;
const data = cache.readQuery({ query });
cache.writeQuery({ query, data: { myField: 'newValue' } });
Cache Persistence
This feature allows you to persist the cache to a storage medium, such as localStorage, so that the cache can be restored when the application is reloaded. This helps in maintaining the state across sessions.
const { persistCache } = require('apollo-cache-persist');
persistCache({
cache,
storage: window.localStorage
});
Redux is a popular state management library for JavaScript applications. While it is not specifically designed for GraphQL, it can be used to manage the state of a GraphQL client by integrating with libraries like `redux-thunk` or `redux-saga` for handling asynchronous actions. Compared to `apollo-cache-inmemory`, Redux provides a more general-purpose state management solution but requires more boilerplate code to set up and manage the state.
React Query is a data-fetching library for React applications that simplifies fetching, caching, and synchronizing server data. It provides built-in support for caching and background data synchronization, making it a good alternative to `apollo-cache-inmemory` for managing server state. However, React Query is not specifically tied to GraphQL and can be used with any data-fetching library or API.
Relay Runtime is a core package of Relay, a JavaScript framework for building data-driven React applications. It provides a normalized in-memory cache for GraphQL data, similar to `apollo-cache-inmemory`. Relay is designed to work seamlessly with GraphQL and provides advanced features like automatic query batching and efficient data fetching. Compared to `apollo-cache-inmemory`, Relay Runtime offers a more opinionated and integrated approach to managing GraphQL data.
FAQs
Core abstract of Caching layer for Apollo Client
The npm package apollo-cache-inmemory receives a total of 309,557 weekly downloads. As such, apollo-cache-inmemory popularity was classified as popular.
We found that apollo-cache-inmemory demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 4 open source maintainers collaborating on the project.
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