Comment by wiredfool

Ok, from memory --

There's a pre, do and post phase for the migrations. When you run a single migration, it's: pre, do, post. When you run 2 migrations, it's: pre [1,2], do: [1,2], post: [1,2].

So, if you have a migration that depends on a previous migration's post phase, then it will fail if it is run in a batch with the previous migration.

When I've run into this is with data migrations, or if you're adding/assigining permissions to groups.