Graphql Filter Results

This is a useful package to get data struct which developer write in gql schema

Why we use this?

For example, if we want to query user in our db, we may query the whole user record. But we only need name and email column. This suitation you can use graphql-filter-results to get which column developer wanted through info Argument in GraphQL Resolvers.

query {
  adminUsers {
    name
    email
  }
}

Actually, we often do the business logic as below:

const resolvers = {
  Query: {
    users: (root, {userId}, context, info) => {
      const { User } = context;
      // it will execute `select * from "User" where "adminType"=true`
      return await User.findAll({
          where: {
              adminType: true
          },
      });
  },
};

What we do to improve the query:

import { pickoutFieldWithInfo } from 'graphql-filter-results';
const resolvers = {
  Query: {
    users: (root, {userId}, context, info) => {
      const { User } = context;
      const filterFields = pickoutFieldWithInfo(info);
      // it will execute `select name, email from "User" where "adminType"=true`
      return await User.findAll({
          where: {
              adminType: true
          },
          attributes: filterFields
      });
  },
};

That will reduce your RAM memory when you query which too much data;

Usage

import { pickoutFieldWithInfo } from 'graphql-filter-results';
// `info` Argument in GraphQL Resolvers.
const filterFields = pickoutFieldWithInfo(info);

Example

https://github.com/function-hub/graphql-filter-results-example