Resume about relay fragments

Fragments.md

About Fragment

• Fragment is the building block of the relay
• Fragment is a selection of fields on a GraphQL Type
• Fragment allow you to colocate data
• Relay composes fragments from multiple components into optimized and efficient batches to reduce round-trips to the server
• Its hard to over-fetch and under-fetch
• Components can only access data they've asked for - data mask - each one must declare its own data requirements without relying on others
• Components only re-render when the exact data they're using is updated, preventing unnecessary re-renders
• In short, colocating data make your components modular, easier to refactor, more performant and less error-prone
• Relay requires globally unique fragments names. The convention is <module_name>_<property_name>
• The fragment reference is the object that contains the fragment in the root query, passed into the component as a prop from the parent component. Is like a pointer to a specific instance of a type that we want read data from