[alembic] import the own model into myproject/alembic/env.py

[c.b...@posteo.jp]

I want to use `alembic revision --autogenerate` with my own model
classes. Because of that I need to import them in
`myproject/alembic/env.py` as [described in the docs][1]. But this
doesn't work even if I tried a lot of variations.

I am not sure in which context (don't know if this is the correct word)
does alembic run the `env.py`. Maybe that causes some errors.

This is the directory and file structure I use.

myproject/
common/
__init__.py
model.py
alembic/
env.py

The error is kind of that

from .common import model
SystemError: Parent module '' not loaded, cannot perform relative
import

`myproject` itself is just a repository/working directory. It is not
*installed* into the system (with `pip3`, `apt-get`, `easyinstall` or
anything else).


[1]: http://alembic.readthedocs.org/en/latest/autogenerate.html

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[Mike Bayer]

On 8/16/15 8:57 AM, c.b...@posteo.jp wrote:
> I want to use `alembic revision --autogenerate` with my own model
> classes. Because of that I need to import them in
> `myproject/alembic/env.py` as [described in the docs][1]. But this
> doesn't work even if I tried a lot of variations.
>
> I am not sure in which context (don't know if this is the correct word)
> does alembic run the `env.py`. Maybe that causes some errors.
>
> This is the directory and file structure I use.
>
> myproject/
> common/
> __init__.py
> model.py
> alembic/
> env.py
>
> The error is kind of that
>
> from .common import model
> SystemError: Parent module '' not loaded, cannot perform relative
> import
>
> `myproject` itself is just a repository/working directory. It is not
> *installed* into the system (with `pip3`, `apt-get`, `easyinstall` or
> anything else).

If you aren't using a virtualenv, then set PYTHONPATH to point to where
"myproject" starts so that you can use a fully-qualified import, e.g.
"import myproject.common.model".





>
>
> [1]: http://alembic.readthedocs.org/en/latest/autogenerate.html
>