In this third episode of the Card Maker series, Chris Tse and Luke Melia craft a database-driven app designed for efficient RSVP and guest management. This episode highlights the essential master-detail relationship between a guest list and individual guests, a fundamental pattern in database-driven applications. Luke delves into techniques for hierarchical navigation and demonstrates the use of our atom format to create tabular grids. These grids showcase a collection of cards, a typical feature in SaaS applications, providing an in-depth look at practical, real-world app development. Introduction (0:00) Guest Database (0:42) Custom GPT for Boxel (2:06) Generating a Guest Card with AI (3:05) Card Def Vs Field Def (5:55) Guest Card creation (7:55) Creating a List Card (19:05) Syntax Error Panel (26:59) Creating an Instance (27:35) Atom Format (30:03) Interact Mode (35:20) Create a new Card Action (43:21) Overview: Drafts Workspace (53:56) AI Quality (56:34) Conclusion (58:38) ------------------------------------------------------------------------- Read more about Boxel Code Mode here: https://medium.com/cardstack/cardstack-product-update-1803d25a4ba3 Watch the Card Maker series here:    • The Card Maker Series   Follow our progress here: https://github.com/cardstack/boxel