django-migraid 0.3.0b2

Detect, diagnose, and auto-fix Django migration problems, circular dependencies, and merge conflicts.

django-migraid

Detect, diagnose, and auto-fix Django migration problems in Git workflows.

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The Problem

Two developers branch from main at migration 0004. Both generate 0005_*.py. Main merges one. The second developer's rebase leaves them with a conflict that makemigrations --merge doesn't cleanly handle in rebase-based workflows. django-migraid fixes this — and ten other common migration pain points.

Installation

pip install django-migraid

Add to INSTALLED_APPS:

INSTALLED_APPS = [
    ...
    "migraid",
]

Quick Start

# Diagnose all migration issues in your project
python manage.py migraid doctor

# Rebase your branch's migrations onto main
python manage.py migraid rebase --base main --dry-run

# Rebase AND keep django_migrations in sync for applied migrations (CI-friendly)
python manage.py migraid rebase --base main --update-db --noinput

# Fix conflicting leaf migrations
python manage.py migraid fix-conflicts --dry-run

# Fix out-of-order numbering
python manage.py migraid renumber myapp --dry-run

# Remove stale django_migrations rows
python manage.py migraid prune --yes

# Clean up untracked migration files after switching branches
python manage.py migraid sync-branch --dry-run

# Visualize the migration DAG
python manage.py migraid graph myapp --format mermaid

Problems This Solves

Issue	Code	Django Error / Search Term	Command
Conflicting leaf migrations	E001	multiple leaf nodes, migration merge conflict	fix-conflicts
Circular migration dependencies	E002	CircularDependencyError, circular dependency	— (reports)
Out-of-order numbering	E003	gap in numbering, renumber migrations	renumber
Dependency on a deleted migration	E004	NodeNotFoundError, missing dependency	— (reports)
Renamed applied migration	E005	InconsistentMigrationHistory, table desync	rebase/renumber/fix-conflicts --update-db
Stale django_migrations rows	W001	ghost migrations, remove from django_migrations	prune
RunPython without reverse_code	W002	unreversible data migration	— (reports)
Squashed migration cleanup	W003	remove old migrations after squash	— (reports)
Merge migrations in rebase flow	W004	delete django merge migrations	rebase
Non-deterministic dependencies	W005	random migration order	— (reports)

Common Scenarios & How-To

How to fix a Django migration merge conflict?

When two developers create 0005_*.py on different branches, run:

python manage.py migraid fix-conflicts

This linearizes the migrations into 0005_... and 0006_... automatically.

How to rebase migrations onto another branch?

To renumber your local migrations to follow the latest from main:

python manage.py migraid rebase --base main

How to fix InconsistentMigrationHistory?

If you've renamed or renumbered migrations that are already applied, use the --update-db flag:

python manage.py migraid renumber myapp --update-db

This synchronizes the django_migrations table with your new file names.

How to find circular dependencies?

Run the diagnostic tool to identify cycles in your migration graph:

python manage.py migraid doctor

Command Reference

Commands fall into three groups:

Diagnose (read-only): doctor, graph

Rewrite migration files: rebase, fix-conflicts, linearize, renumber — file plane only by default; pass --update-db to also rename django_migrations rows.

Repair DB / branch state: prune, sync-branch — these commands exist to fix the database or file state directly.

doctor

Read-only diagnostic. Reports every detected issue with severity.

python manage.py migraid doctor [--app LABEL] [--format text|json]

rebase

Renumber local branch migrations to follow the latest from a target branch.

python manage.py migraid rebase [--base BRANCH] [--app LABEL] [--dry-run] [--yes] [--force] [--allow-applied] [--update-db] [--noinput] [--database ALIAS]

fix-conflicts

Resolve multiple-leaf conflicts by linearizing the fork.

python manage.py migraid fix-conflicts [--app LABEL] [--dry-run] [--yes] [--force] [--allow-applied] [--update-db] [--noinput] [--database ALIAS]

linearize

Rewrite history into a gap-free 0001..N chain where each migration depends on exactly one predecessor — renumbering, collapsing redundant dependency lists, resolving forks, and deleting merge migrations in one pass. Cross-app dependencies are preserved by default (--strip-cross-app to drop them).

python manage.py migraid linearize [--app LABEL] [--strip-cross-app] [--dry-run] [--yes] [--force] [--allow-applied] [--update-db] [--noinput] [--database ALIAS]

renumber

Fix gap or duplicate numbering in a single app's migrations.

python manage.py migraid renumber <app> [--dry-run] [--yes] [--force] [--allow-applied] [--update-db] [--noinput] [--database ALIAS]

prune

Remove orphaned django_migrations rows for migrations no longer on disk.

python manage.py migraid prune [--dry-run] [--yes] [--noinput] [--database ALIAS] [--allow-remote-db]

sync-branch

Align local migration files (and optionally the database) to the current git branch state. Detects untracked migration files and optionally removes stale django_migrations rows or reverses applied schema changes.

python manage.py migraid sync-branch [--app LABEL] [--dry-run] [--yes] [--noinput] [--database ALIAS] [--update-db] [--schema]

graph

Print or export the migration DAG.

python manage.py migraid graph [app] [--format mermaid|dot|ascii] [--output FILE]

Safety Model

Commands act on the file plane by default. Any DB change requires an explicit flag.

• --update-db authorizes renaming django_migrations rows in step with file renames (rewrite commands) or deleting stale rows (sync-branch).
• --schema authorizes running migrate backwards to reverse schema changes (sync-branch only).
• prune and sync-branch are inherently DB/file-repair commands — running them is the authorization, and they always preview + confirm before writing.

Every mutation command also:

1. Checks for uncommitted git changes (bypass with --force on rewrite commands)
2. Guards against rewriting already-applied migrations (bypass with --allow-applied, or use --update-db which implies it)
3. Creates a migraid-backup-<timestamp> git ref before any writes
4. Shows a diff-style preview before making changes
5. Asks for confirmation (bypass with --yes / --noinput)
6. Maintains an undo log — reverses all file ops automatically if anything fails
7. Self-validates after apply: if the migration graph gets worse, auto-reverts

--dry-run on any mutation command prints the full preview without writing.

When renaming applied migrations, --update-db renames the matching django_migrations rows in the same per-app transaction.atomic() block as the file changes (preserving the applied timestamp), writes a replayable inverse-SQL undo script, and rolls back both files and rows on any failure. See the --update-db guide.

CI Integration

Add to your pre-push hook or CI pipeline:

python manage.py migraid doctor --format json | jq '.[] | select(.severity == "error")'

Or fail CI on any ERROR-level issue:

python manage.py migraid doctor

(exits non-zero if any E0xx issues are found)

Contributing

See CONTRIBUTING.md.

License

Apache 2.0 — see LICENSE.