GraphQL Best Practices for Shopify Apps

1. Introduction
   • The significance of GraphQL in modern web development
   • Benefits of using GraphQL in Shopify apps
2. Setting Up Your Node.js Environment
   • Installing and configuring necessary libraries
   • Setting up Shopify API access
3. Fundamental GraphQL Concepts
   • Overview of queries, mutations, and subscriptions
   • Understanding schemas, resolvers, and types
4. Designing Efficient GraphQL Schemas
   • Tips for structuring a readable and scalable schema
   • Node.js code example: Defining a simple product schema
5. Writing Robust Queries and Mutations
   • Best practices for crafting flexible and efficient queries
   • Handling data mutations safely
   • Node.js code example: Product query and update mutation
6. Error Handling in GraphQL
   • Common error types in GraphQL and how to handle them
   • Implementing error logging and reporting in Node.js
7. Security Practices for GraphQL
   • Securing GraphQL endpoints against common vulnerabilities
   • Techniques for authentication and authorization
8. Performance Optimization
   • Strategies for minimizing query and response times
   • Using query batching and caching effectively
9. Testing and Debugging GraphQL
   • Tools and strategies for testing GraphQL APIs
   • Node.js code example: Writing tests for GraphQL queries
10. Handling Large Data Sets with Pagination
    • Implementing cursor-based pagination
    • Node.js code example: Paginated data fetching
11. Real-World Use Cases and Patterns
    • Examples of GraphQL usage in high-performing Shopify apps
    • Advanced design patterns and architecture strategies
12. Monitoring and Scaling GraphQL Operations
    • Tools for monitoring GraphQL API performance
    • Strategies for scaling applications
13. Conclusion
    • Recap of GraphQL best practices for Shopify apps
    • Encouragement to continually adapt and innovate

const { Shopify } = require('@shopify/shopify-api');

const shop = 'your-shop-name.myshopify.com';
const accessToken = 'your-access-token';

const client = new Shopify.Clients.Graphql(shop, accessToken);

async function fetchAndUpdateProduct(productId, newPrice) {
  const fetchQuery = `
  {
    product(id: "gid://shopify/Product/${productId}") {
      id
      title
      priceRange {
        minVariantPrice {
          amount
        }
      }
    }
  }`;

  const updateMutation = `
  mutation productUpdate($input: ProductInput!) {
    productUpdate(input: $input) {
      product {
        id
        priceRange {
          minVariantPrice {
            amount
          }
        }
      }
    }
  }`;

  try {
    const fetchedProduct = await client.query({ data: fetchQuery });
    const price = fetchedProduct.data.product.priceRange.minVariantPrice.amount;
    console.log(`Fetched Product Price: ${price}`);

    if (price !== newPrice) {
      const updatedProduct = await client.query({
        data: updateMutation,
        variables: { input: { id: `gid://shopify/Product/${productId}`, price: newPrice } }
      });
      console.log(`Updated Product Price: ${updatedProduct.data.product.priceRange.minVariantPrice.amount}`);
    }
  } catch (error) {
    console.error('Error:', error);
  }
}

fetchAndUpdateProduct('123456789', '29.99');