Issue #95 new file in versions directory

Sylvain Prat avatarSylvain Prat created an issue

Today, it's not possible to add an (empty) file inside the versions directory since it is considered as a migration script and as it does not contain the proper revision and down_revision variables, alembic stops working.

However, allowing us to use a file inside this package would facilitates the packaging: setuptools and distribute do not package the folders not having a file automatically, so the migration scripts end up not packaged by default. We can still use the file to add them, but it's a little annoying since we may forget to do that.

This may have some side effects though: what if someone put some code in Should the code be taken into account in all migration scripts?

May be related to issue #91, but we don't ask exactly the same thing.

Comments (9)

  1. Mike Bayer

    it is related to #91 to the degree that we'd be concerned with what's in the, but this specific issue is more about the discussion in issue #72. Seems like I left off with, "sure, I don't mind getting it to ignore".

    But given the proposals in #91, it seems like there's a choice whether we decide to ignore, or we change Alembic to actually import the versions directory more like a package - even though #91 is more about each version as a package, seems like we should think about what an means here. right now we pull in the version files using imp.load_source() on each file individually.

    The #91 change isn't happening on my end anytime soon, whereas just ignoring is a quick fix.

  2. Sylvain Prat

    Exact, my feature request is more about the discussion in #72 and I don't really need what's described in #91 - seems strange to me to have so much code in a migration script.

    I'm in favor of ignoring the file for now, but the real question is: should it be ignored silently?

    Actually, since you don't generate an by default, there's no incentive to put code there. So, if the user choose to add one, we can assume he knows what it does and just ignore the file silently. But, like I said before, the migrations scripts will not be packaged by default in this setup.

    I would prefer the file to be there by default so we don't forget to package the versions files, but I guess we should warn the user that he should not add code in the file, maybe by putting a big uppercase warning comment in the file?

    Or maybe this file should just be the new

  3. Mike Bayer

    I don't see the need for to move like that, it's a separate and very specific concern versus the environment in which migration files run. an would theoretically include helpers that migration scripts use but really, I put those helpers in my application elsewhere (usually in myapp/model/migration/).

    at the moment the thinking is just that we'll let be there so as to take advantage of a behavioral artifact of distutils, but otherwise it's a do-nothing file. Im sure people will start asking for it to be functional at some point, but we can address that later.

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