CODEWITHSUNDEEP
sqlalchemydjango-southdjango-migrationsalembic
Alex Rothberg
Alex Rothberg

Reputation: 10993

Alembic Migrations without Database

Is it possible to have Alembic auto-generate migrations without it having access to the database?

For example django / south are able to do this by comparing the current version of a Model against a previous snapshot of the Model.

Upvotes: 5

Views: 2059

Answers (1)

Gricey
Gricey

Reputation: 1441

No, this isn't possible. In the relevant issue zzzeek said

while the reflection-based comparison has its issues, it really is a very fundamental assumption these days particularly in the openstack world where autogen features are used in unit test suites to ensure the migrated schema matches the model. I don't have plans right now to pursue the datafile-based approach, it would be an enormous undertaking for a system that people seem to be mostly OK with as is.

Though an alternative approach could be to spin up a new database on demand, run the migrations from empty to head, generate against it, then discard the database.

Upvotes: 2

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