Rails Schema Preview

Preview Rails db/schema.rb files as interactive ER diagrams inside VS Code.

Created by Adin Omic.

Features

Interactive table diagram with relationship edges.
Table, index, search, and relationship detail views.
Automatic preview refresh when the current schema.rb changes.
Declared and inferred relationship detection for conventional *_id columns.
Focused large-schema viewing with related, 2-hop, and full-schema scopes.
Compact, keys-only, and full table node detail modes.
Searchable table navigator with toggleable edge labels, minimap, legend, and details drawer.
Generated schema documentation, health hints, and visual index summaries.
Jump from parsed tables, columns, indexes, and relationships back to schema.rb lines.
Static db/seeds.rb preview for common create/upsert seed operations.
Persisted diagram UI preferences per webview session.
PNG and SVG export.

npm install
npm run compile
npm test

Open a Rails schema.rb, then run Rails Schema Preview: Open Preview.