rb:constraint-debug

Diagnose ActiveRecord constraint failures and migration mismatches in Rails applications.

7|Updated Mar 22, 2026

Search Tags:#debugging #database #migrations #constraints #diagnose #rails #activerecord

Ready to run

npx skills add https://github.com/slbug/claude-ruby-grape-rails --skill rb-constraint-debug

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Please help me install this Agent Skill.
Skill: rb:constraint-debug
Source: https://github.com/slbug/claude-ruby-grape-rails/tree/main/plugins/ruby-grape-rails/skills/active-record-constraint-debug
Command: npx skills add https://github.com/slbug/claude-ruby-grape-rails --skill rb-constraint-debug

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Diagnose ActiveRecord constraint failures, unique index violations, foreign-key errors, and migration/data mismatches in Rails apps.

Core Features & Use Cases

Provide pattern-based guidance for diagnosing constraint and foreign-key violations.
Map database constraints to model validations and migrations; identify mismatches.
Use structured debugging patterns to reproduce and fix issues in complex schemas.

Quick Start

Invoke the constraint-debug skill when you encounter AR constraint violations to quickly identify root causes and recommended fixes.

Frequently Asked Questions about rb:constraint-debug

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

FAQPage Schema

How do I diagnose ActiveRecord constraint violations in Rails?▼

To diagnose ActiveRecord constraint violations in Rails, map database constraints to model validations and inspect failing writes. This identifies root causes for unique index errors and foreign-key violations by highlighting schema and data mismatches.

Why does my Rails migration fail with a foreign-key constraint error?▼

Rails migration foreign-key constraint errors occur when referenced data is missing or invalid. Diagnosing the issue involves inspecting failing writes and mapping database constraints against model validations to find schema mismatches causing the violation.

What is the best way to debug unique index errors in ActiveRecord?▼

The best way to debug unique index errors in ActiveRecord is using structured debugging patterns to reproduce the failing writes. Mapping database constraints to model validations reveals mismatches and provides actionable checklists to prevent regressions.

Can I map database constraints to model validations in a Ruby on Rails application?▼

Yes, you can map database constraints to model validations in a Ruby on Rails application. This process inspects schema definitions against model code to detect mismatches that cause unique index or foreign-key violations during data writes.

How do I fix ActiveRecord data mismatches causing constraint failures?▼

Fix ActiveRecord data mismatches by inspecting failing writes and applying pattern-based debugging guidance. Mapping database constraints to model validations identifies the exact schema mismatch, enabling targeted fixes and preventing future regressions.