voormedia/rails-erd

Health v2 · maintenance only

Adoption not part of the score

4105 stars · 379 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

A Ruby gem that generates entity-relationship diagrams from Rails applications' Active Record models using reflection. It outputs Mermaid diagrams by default (rendering natively on GitHub) and can also produce styled PDF/PNG/SVG diagrams via Graphviz.

Use cases

• generate ER diagrams for my Rails models
• document database schema relationships in a Rails app
• visualize Active Record associations including has_many :through
• create model diagrams that render on GitHub READMEs
• inspect a Rails app's domain model programmatically
• export database diagrams as PDF, PNG, or SVG

When to choose

• you maintain a Ruby on Rails application and want automatic model documentation
• you need diagrams that capture meta-programmed associations via runtime reflection
• you want Mermaid output that renders natively on GitHub
• you need a customizable API to build your own model diagrams

When to avoid

• your project is not built on Rails or Active Record
• you need diagrams for non-Ruby ORMs or raw SQL schemas
• you need a general-purpose diagramming tool unrelated to data models

Facets

library · maturity stable

documentation data-visualization developer-tools web-development developer-tools documentation databases ruby cli rails entity-relationship-diagram active-record mermaid graphviz erd

Member repositories

For agents

markdown · JSON · MCP: product_card(name="voormedia/rails-erd")