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Data Flow Philosophy

Related Philosophies

This is how data flows through the app:

  1. Server pushes data to the disk of any client (Server -> Pusher event -> Action listening to pusher event -> Onyx.update()).
  2. Disk pushes data to the UI (Onyx -> useOnyx() -> React component).
  3. UI pushes data to people's brains (React component -> device screen).
  4. Brain pushes data into UI inputs (Device input -> React component).
  5. UI inputs push data to the server (React component -> Action -> XHR to server).
  6. Go to 1

New Expensify Data Flow Chart

Rules

- API commands SHOULD return created/updated data directly

When adding new API commands, always prefer to return the created/updated data in the command itself, instead of saving and reloading. For example: if we call CreateTransaction, we SHOULD prefer making CreateTransaction return the data it just created instead of calling CreateTransaction then Get rvl=transactionList.