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ThibautBaissac
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rails-model-generator

Scaffold Rails models through a TDD workflow from failing spec to green tests.

643|80|Updated Dec 9, 2025
Search Tags:#tdd#validation#migration#spec#model#generator#rails
One-click install
npx skills add https://github.com/ThibautBaissac/rails_ai_agents --skill rails-model-generator
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: rails-model-generator
Source: https://github.com/ThibautBaissac/rails_ai_agents/tree/main/skills/rails-model-generator
Command: npx skills add https://github.com/ThibautBaissac/rails_ai_agents --skill rails-model-generator

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Too many Rails teams waste time wiring models, migrations, and tests in separate steps, leading to misaligned design and flaky validation.

Core Features & Use Cases

  • TDD-driven workflow that starts with a failing spec, followed by a migration, then the model implementation, ensuring correctness by design.
  • Provides templates and guidance for defining model attributes, validations, associations, and database structure, enabling repeatable scaffolding.
  • Use Case: when adding a new core domain model, this Skill guides you from requirements through to green specs and a working table.

Quick Start

Define requirements for the new model, write a failing spec that expresses the desired behavior, and progressively implement the model through migration and code until the test suite passes.

Frequently Asked Questions about rails-model-generator

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

FAQPage Schema
How do I scaffold a Rails model using TDD starting with a failing spec?▼

To scaffold a Rails model using TDD, start by defining requirements and writing a failing spec expressing desired behavior, then progressively implement through migration and code until tests pass.

What's the best way to add validations and associations to a Rails model?▼

The best way to add validations and associations is through a TDD-first workflow that provides templates and guidance, ensuring repeatable scaffolding from spec through factory and migration to green tests.

How does a TDD-first workflow prevent flaky validation when creating Rails migrations?▼

A TDD-first workflow prevents flaky validation by starting with a failing spec that expresses desired behavior, then generating the migration and model implementation to ensure a structured path to green tests.

Can I use this Rails model scaffolding workflow for adding validations to existing models?▼

Yes, this Rails model scaffolding workflow applies to creating new models, adding validations, defining associations, and generating migrations, guiding you from requirements through to green specs.

Do I need to write a factory before generating a Rails model migration in this workflow?▼

In this workflow, you define requirements, write a failing spec expressing desired behavior, and progressively implement the model through migration and code, incorporating factory templates alongside the spec and migration.

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