A Ruby library for composing business logic into commands that sanitize and validate input, promoting safe and maintainable code.
Mutations is a Ruby library that structures business logic into command objects. It solves the problem of scattered validation and business logic in Rails apps by providing a dedicated place to sanitize inputs, validate data, and execute operations safely. This approach reduces reliance on ActiveRecord callbacks and validations, making code more reusable and testable.
Ruby and Rails developers building applications with complex business logic, especially those working on JSON APIs or maintaining large codebases where separation of concerns is critical.
Developers choose Mutations because it offers a clean, explicit pattern for handling input validation and business operations, reducing security risks from mass assignment and eliminating tight coupling to Rails models. Its declarative syntax and structured error handling make it ideal for building maintainable, API-first applications.
Compose your business logic into commands that sanitize and validate input.
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Allows explicit definition of required and optional inputs with type checking and coercion, as shown with string, boolean, and model types in the example, ensuring data integrity from the start.
The execute method only runs after all inputs pass validation, preventing business logic from processing invalid data, which reduces errors and enhances reliability.
Encapsulates business logic in standalone classes that can be invoked from controllers, APIs, or background jobs, promoting code reuse across the application, as highlighted in the README's philosophy.
Provides symbolic and message-based error objects (e.g., outcome.errors.symbolic) that integrate easily with JSON APIs, simplifying error responses in API endpoints.
Whitelists inputs declaratively instead of relying on attr_accessible or strong parameters, avoiding security risks, as emphasized in the README's key features.
The README admits there's no built-in way to use Mutations with Rails form tag helpers, requiring custom adapters for traditional HTML forms, which can be a hassle for server-rendered apps.
Error messages are not automatically tied to Rails' I18n system; developers must write a custom error message generator for localization, adding extra configuration work.
Mutations only accepts hashes as arguments to run, which might be limiting for some use cases and forces data structuring into hashes, even when other formats could be more natural.
For straightforward operations, introducing Mutations can add layers of abstraction that may not be justified, leading to increased code complexity and a steeper learning curve for teams.