How to Transform Data from GraphQL Server using Vue Composition API

Learn how to effectively transform the data received from a GraphQL server using the Vue Composition API in your front-end applications.
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Transform Data from GraphQL Server using Vue Composition API

When developing a front-end application, it’s common to fetch data from a GraphQL server. As a beginner, you might find yourself grappling with how to manipulate and display this data effectively in Vue.js, especially if you are utilizing the composition API. If you've encountered difficulties in transforming data retrieved via GraphQL in your Vue components, you're not alone. Let’s take a closer look at the process and how to overcome this challenge.

Understanding the Challenge

After executing a GraphQL query using the useQuery method provided by @ vue/apollo-composable, you may find that you're unable to work directly with the response data returned in a way that you need. In the given scenario:

The result from the GraphQL server is wrapped in a Vue ref, making it a reactive variable.

Directly trying to access the value of result using ref(result).value after defining result does not yield the expected outcome — you may encounter an undefined value.

This issue arises because the result doesn't become available until the query is resolved, leaving the developer with a tricky situation on how to manipulate this data for templates.

Effective Solution: Leverage onResult

The key to transforming your data after fetching it from a GraphQL server lies in using the onResult feature associated with useQuery. This enables you to handle updates as the data arrives from the server. Here’s a breakdown of how to implement this solution:

Step 1: Set Up Your Component

In your Vue component, you first need to set up the GraphQL query using useQuery. Import necessary functions at the top of your component file:

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Step 2: Define Your Data Structure

Within the setup function, declare your reactive variables. You’ll create an object to hold your transformed data:

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Step 3: Fetching Data with useQuery

Implement useQuery and set up the onResult method to handle incoming data and apply transformations.

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Step 4: Accessing Transformed Data in Templates

Now that you have transformed your data, you can access instruments.instruments and instruments.filteredInstruments in your templates without any issue. Use v-for or other directives as needed to display the data properly.

Wrap Up

By using the onResult method provided by useQuery, you can effectively transform and filter your GraphQL results after they are fetched. This method allows you to reactively handle incoming data and manipulate it for your component needs. Following the outlined steps will enable you to use the Vue Composition API proficiently in your application and facilitate a better data experience.

Feel free to experiment further with other transformations needed based on your specific application requirements. Happy coding!