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Django Orm Lens
Django ER diagrams, N+1 detection, schema drift & migration-risk linting — in VS Code, a CLI and an MCP server. Static analysis: no database, no django.setup(). Free & MIT.
Install
$
uvx django-orm-lens scan -f tableClaude Code
claude mcp add django-orm-lens -- uvx django-orm-lens scan -f tableCursor / Claude Desktop (mcp.json)
{
"mcpServers": {
"django-orm-lens": {
"command": "uvx",
"args": [
"django-orm-lens",
"scan",
"-f",
"table"
]
}
}
}Install command taken from the project's README or registry entry. Always review code before running it.
README excerpt
Read full README on GitHub →English · Русский · Español · 中文
Django ORM Lens
ER diagrams, N+1 detection and migration-risk checks for Django — without booting it.
Your entire model graph — live in your editor sidebar, gating your CI, and answering your AI agent over MCP. All from static parsing: no database, no runserver, no working venv.
Replaces: graph_models + django-schema-graph + hand-drawn ER diagrams + grep archaeology.
Featured in Django News #347 · PyCoder's Weekly #746
⚡ 10 seconds to first insight
uvx django-orm-lens scan -f table # every app and model at a glance
uvx django-orm-lens nplusone # N+1 loops, with the select_related to add
uvx django-orm-lens migration-risk # migrations that lock tables or fail on existing rows
Cold clone, broken venv, no settings module — you still see every app and model of the project, then the N+1 loops and risky migrations in it, right in your terminal. (uvx is from uv; pipx run works the same way.)
Then pick your surface — three distributions, one parser core:
| You are | Install | You get |
|---|---|---|
| Editor user — VS Code / Cursor / Windsurf / VSCodium | code --install-extension frowningdev.django-orm-lens |
Field autocomplete in .filter(), sidebar tree, live ER diagram, hover cards, 18 lint rules with QuickFixes |
| Terminal / CI user | pip install django-orm-lens |
17 subcommands, SARIF + PR annotations, pre-commit hooks, a GitHub Action |
| AI-agent user — Cursor / Claude Code / Aider / Zed / Continue | pip install "django-orm-lens[mcp]" |
13 read-only MCP tools answering schema questions from ground truth |
MCP setup is one JSON block — see Integrations. Point DJANGO_ORM_LENS_ROOT at your Django project's absolute path.
🆓 Paid-tier capabilities, free and MIT
Schema review is a paid category nearly everywhere. A bot that reviews every pull request, analysis that follows a queryset past the function it was built in, a check that catches schema drift, index advice grounded in real table statistics — those normally sit behind a per-seat or per-database subscription.
All of it is here, MIT-licensed, with no tier gate, no seat count, no account, and no telemetry:
| Capability usually sold as a paid tier | Here |
|---|---|
| PR review bot for schema changes — posts once, then updates in place | blast-radius + the Action |
| Analysis that follows a queryset across functions | nplusone |
| Schema drift detection | drift |
| Index proposals from observed QuerySet usage | suggest-indexes |
| Migration risk weighed against real table sizes | blast-radius --stats |
| Blast radius of a destructive migration | blast-radius |
| Cross-layer impact of removing a field | impact |
There is no Pro tier, and none is planned. If the tool saves you an afternoon, a star is the entire ask.
📊 Traction
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