Liveview

When to Use

• Adding or changing LiveView modules (mount, handle_params, handle_event, handle_info).
• Building or refactoring LiveComponents or function components used in LiveView.
• Handling async work or real-time updates in LiveView.
• Writing or fixing LiveView tests.

Principles

1. State in assigns: Keep UI state in socket.assigns; avoid storing large or redundant data. Derive in mount/handle_params/handle_event or in the template when possible.
2. Thin callbacks: Delegate business logic to context functions. In handle_event, call context then update assigns or push_navigate/push_patch. Use send(self(), {:result, ...}) and handle_info for async work.
3. Components: Extract repeated markup into function components (in lib/my_app_web.ex) or LiveComponents. Use slots and attributes for configuration.
4. Security: Never assign user-controlled data that is rendered as raw HTML without sanitization. Use Phoenix.HTML and helpers for escaping; validate uploads with .