facts controller

资 源 简 介

facts controller

详 情 说 明

A facts controller in a Rails application typically serves as the intermediary between the user interface and the database, handling CRUD (Create, Read, Update, Delete) operations for facts—pieces of data or truths stored in the system.

The controller includes actions like `index` to list all facts, `show` to display a single fact, `new` and `create` to add new facts, `edit` and `update` to modify existing ones, and `destroy` to remove them. Business logic, such as ensuring only authorized users can modify facts or validating input before saving, is often handled here.

Strong parameters (`params.require(:fact).permit(...)`) are commonly used to prevent mass-assignment vulnerabilities by explicitly allowing which attributes can be modified. Additionally, before actions (like `set_fact`) help DRY up the code by loading a fact before certain actions (e.g., `show`, `edit`).

Error handling—such as rescuing from `ActiveRecord::RecordNotFound`—ensures a smooth user experience even when unexpected issues arise. The controller may also interact with other components like services, models, or background jobs for complex operations.

By structuring the controller cleanly, separating concerns, and leveraging Rails conventions, you maintain scalable and maintainable code.