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React withGraphQL: Optimistic Response - What & Why

cherenkor profile image Sergey Kucherenko ・2 min read

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The Problem

You start your new project with React & GraphQL. It's super cool & you tried to make it super-fast. But your backend is reaaaally slow and all these loaders are unbelievably annoying. You are a client-oriented developer and trying your best to solve this problem. Likely for you, as you used GraphQL, we can use the Optimistic UI approach.

Official definition: Optimistic UI is a pattern that you can use to simulate the results of a mutation and update the UI even before receiving a response from the server. Once the response is received from the server, the optimistic result is thrown away and replaced with the actual result.

I couldn't say better:)
So we only simulate that the backend sends us the response right away so from the user's perspective every response comes instantly.

How to use?

When we call a mutation we can also pass an additional optimisticResponse property and describe what we're going to retrieve from it. That one we would eventually receive from the backend. Here's an example:

 updateComment({  
      variables: { commentId, commentContent },
      optimisticResponse: {  
          __typename: 'Mutation',  
          updateComment: {  
          id: commentId,  
              __typename: 'Comment',  
              content: commentContent,  
          },  
      },  
})
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Basically, when you call this mutation GraphQL will update the cache for this comment with new data instantly.


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Also, you can update the cache manually when data will arrive from the backend but it's a totally new story. For now, check this feature out and write in the comments what do you think about it.

For more details go to the official GraphQL documentation

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