Transactions and Protocols: Phoenix App from Scratch, Episode 3

How to model financial transactions, use Ecto decimals, and build reusable currency formatting components in Phoenix LiveView.

[series] Build a complete budget tracking app in Phoenix LiveView! In this episode, we'll: - Decide how to model transactions - Compare decimal and float data types - Create and list transactions - Walk through some Phoenix forms magic - Create Phoenix components for currency display - Calculate balances from transactions Learn how to: - Use Ecto enums and decimals for financial data - Build reusable currency formatting components - Implement financial calculations correctly - Build stateless Phoenix components from scratch Links Screen recording software I use (affiliate): screen.studio/@Yy75o Project repo: github.com/ChristianAlexander/tutorial-budget-app Changes from this video: github.com/ChristianAlexander/tutorial-budget-app/pull/7 phx.gen.schema: hexdocs.pm/phoenix/Mix.Tasks.Phx.Gen.Schema.html Ecto.Query: hexdocs.pm/ecto/Ecto.Query.html Timestamps Choosing a data model - 00:00 Create the schema - 01:12 Why decimal matters - 02:52 Context module functions - 04:12 Create transaction form - 05:43 Where did that name come from? - 07:13 Protocols! - 07:50 Add a table - 10:05 Build stateless components - 10:51 Sum up the transactions - 13:19 End result - 15:30 What's next? - 15:48 Music from #Uppbeat (free for Creators!): uppbeat.io/t/dan-barton/the-executive-lounge License code: KO1KHN4PJPHPU0G0