it's pretty doable if you add a new ${thing} to your mako template. getting a
value in there requires a trick, there's an example of it here:
https://github.com/sqlalchemy/alembic/issues/686#issuecomment-616828129
which is to put a dictionary inside of another dictionary and pass that as
"template_args" when you context.configure(); suppose you send it as
template_args={"my_dictionary": {}}. then anywhere you are, in a render hook,
in env.py, whatever, put whatever you want in that dictionary. then reference
in your template as ${my_dictionary['some_value']} .
On Tue, May 5, 2020, at 5:24 PM, Adrian wrote:
> I have a custom type implementing enums (no idea if there's something better
> now, but it's used in many places so
> replacing it is not an option atm). Currently I'm using render_item to simply
> import the type and the enum and pass the
> enum to the type and it works fine.
>
> However, in the alembic revision I'd prefer to define a copy of the enum how
> it looked like at generation time since it may
> change and in that case running an older revision's upgrade would be broken
> as it would generate the column based on
> a different enum.
>
> In any case, I would like to have the enum definition inside my revision
> file, either top-level or inside `upgrade`. But for neither
> of these options I found any way to do it properly as there doesn't seem to
> be any way to provide code to be included in
> `upgrade` or variables for the mako template context used to render the
> revision file.
>
> I managed to do it using this **incredibly ugly** workaround, but I really
> hope there's some better way... so if there is one, please
> let me know. Because not adding this abomination in my codebase would be
> great:
> https://gist.github.com/ThiefMaster/3ad2a35b531ff5cada7d2232333619fa
>
> Thanks for any help/suggestions!
>
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> The Python SQL Toolkit and Object Relational Mapper
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SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
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