form-object-patterns

Name: form-object-patterns
Availability: InStock
Author: thibautbaissac

Coordinate multi-model Rails form logic with an ApplicationForm base.

643|80|Updated Dec 9, 2025

Search Tags:#tdd #validation #patterns #multi-model #rails #wizard #form-object

Ready to run

npx skills add https://github.com/ThibautBaissac/rails_ai_agents --skill form-object-patterns

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: form-object-patterns
Source: https://github.com/ThibautBaissac/rails_ai_agents/tree/main/skills/form-object-patterns
Command: npx skills add https://github.com/ThibautBaissac/rails_ai_agents --skill form-object-patterns

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Complex Rails forms across multiple models or non-persisted data are hard to manage with plain ActiveRecord forms, leading to scattered validations and brittle controllers.

Core Features & Use Cases

Multi-model registration and update forms that coordinate several models in a single flow
Wizard-style multi-step forms and non-persisted or virtual attributes handling
A structured TDD-first workflow with a base ApplicationForm to simplify validations and persistence
Real-world examples include multi-model signups, search forms, and wizard setups

Quick Start

Define a new form object in app/forms, write specs first (RED), implement the form, and run the tests.

Frequently Asked Questions about form-object-patterns

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I handle multi-model form validations in Rails without cluttering controllers?▼

Multi-model form validations in Rails are handled using form objects to encapsulate logic. An ApplicationForm base coordinates validations and persistence across several models, replacing scattered ActiveRecord callbacks with modular, testable objects.

What is the best way to build a multi-step wizard form in Rails?▼

Building a multi-step wizard form in Rails is best achieved with form objects. They manage non-persisted virtual attributes and state across steps, keeping validation logic isolated from controllers and ensuring robust data handling.

How do I test Rails form objects using TDD?▼

Test Rails form objects using TDD by writing specs first to define expected validation behavior (RED). Implement the form object in app/forms to satisfy the tests, ensuring complex multi-model logic is fully validated before persistence.

When should I use a form object instead of ActiveRecord nested attributes?▼

Use a form object instead of ActiveRecord nested attributes when dealing with non-persisted forms, complex multi-model registrations, or wizard steps. Form objects prevent brittle controllers and scattered validations inherent to plain ActiveRecord forms.

Can I manage non-persisted search forms in Rails with a form object pattern?▼

Yes, you can manage non-persisted search forms in Rails with a form object pattern. Form objects handle virtual attributes and validations for search queries without needing database tables, providing structured query handling.