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# Issue The cache updates are performed in a wrong way, resulting in a duplicate collection: **Error:** ```log webpack-internal:///./node_modules/react-dom/cjs/react-dom.development.js:88 Warning: Encountered two children with the same key, `6f3f7265-0d97-4708-a3ea-7dee76dc0a0a`. Keys should be unique so that components maintain their identity across updates. Non-unique keys may cause children to be duplicated and/or omitted — the behavior is unsupported and could change in a future version. ``` **Video:**  # Fix **Video:**  |
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Apollo Example
Apollo is a GraphQL client that allows you to easily query the exact data you need from a GraphQL server. In addition to fetching and mutating data, Apollo analyzes your queries and their results to construct a client-side cache of your data, which is kept up to date as further queries and mutations are run.
In this simple example, we integrate Apollo seamlessly with Next.js data fetching methods to fetch queries in the server and hydrate them in the browser.
This example relies on Prisma + Nexus for its GraphQL backend.
Demo
https://next-with-apollo.now.sh
Deploy your own
Deploy the example using Vercel:
How to use
Execute create-next-app with npm or Yarn to bootstrap the example:
npx create-next-app --example with-apollo with-apollo-app
# or
yarn create next-app --example with-apollo with-apollo-app
Deploy it to the cloud with Vercel (Documentation).