How to apply filter on graphql running on json file?

by herminia_bruen , in category: Javascript , 16 days ago

How to apply filter on graphql running on json file?

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1 answer

by tressie.damore , 15 days ago

@herminia_bruen 

To apply a filter on a GraphQL query running on a JSON file, you can use arguments in your GraphQL query to filter the data based on specific criteria. Here's an example of how you can apply a filter on a GraphQL query running on a JSON file:

  1. Define a GraphQL query with arguments for filtering:
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query {
  users(filter: { username: "john.doe" }) {
    id
    username
    email
  }
}


In this example, we are filtering the list of users based on the username "john.doe".

  1. Implement a resolver function in your GraphQL server that handles the filtering logic:
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const resolvers = {
  Query: {
    users: (parent, args, { dataSources }) => {
      const { filter } = args;
      const users = dataSources.usersAPI.getUsers();
      
      if (filter) {
        return users.filter(user => user.username === filter.username);
      }
      
      return users;
    }
  }
};


In this example, the resolver function filters the list of users based on the username specified in the filter argument.

  1. Run your GraphQL server and send the query with the filter:


When you run your GraphQL server, you can send a query with the filter argument to get the filtered data:

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curl -X POST -H "Content-Type: application/json" --data '{ "query": "{ users(filter: { username: "john.doe" }) { id username email } }" }' http://localhost:4000/graphql


This will return the user with the username "john.doe" from the JSON data.


By following these steps, you can apply a filter on a GraphQL query running on a JSON file.