Before diving into using Supabase with Apollo Server, make sure you've already got a project set up with both Supabase and Apollo Server installed and running smoothly.

First things first, you'll need to install the 'supabase' and 'graphql' packages. Just pop open your terminal and run:

npm install supabase graphql

Next up, you need to initialize your Supabase client. You'll need your Supabase URL and Supabase Anon Key, which you can find in your Supabase dashboard settings.

import { createClient } from '@supabase/supabase-js'

const supabaseUrl = "your-supabase-url";
const supabaseAnonKey = "your-supabase-anon-key";

const supabase = createClient(supabaseUrl, supabaseAnonKey);

Now that your Supabase client is ready, it's time to set up your Apollo Server. This is where the 'graphql' package we installed earlier comes into play.

import { ApolloServer } from 'apollo-server';

You'll then need to build your Apollo server, using 'supabase' as the context so it's accessible within your resolvers.

const server = new ApolloServer({ 
  typeDefs,
  resolvers,
  context: {
    supabase
  }
});
server.listen().then(({ url }) => {
  console.log(`Server ready at ${url}`);
});

With Supabase and Apollo Server set up, it's time to create your GraphQL schema and resolvers. The schema ('typeDefs') defines the structure of your data, while the resolvers specify how to fetch it.

In the resolvers, use the 'supabase' context we defined earlier to fetch data from your Supabase tables.

const typeDefs = gql`
  type Query {
    getData: [Data]!
  }

  type Data {
    id: ID!
    name: String
  }
`;

const resolvers = {
  Query: {
    getData: async (parent, args, context, info) => {
      const { data, error } = await context.supabase
      .from('Data')
      .select();
      
      if (error) throw error;
      
      return data;
    },
  },
};

And there you have it! With these steps, you'll be able to use Supabase with Apollo Server in your application.