On Thursday, March 19, 2020 at 7:19:08 PM UTC-4, Mike Bayer wrote:
>
> so let me get this straight:
>
> 1. you have many schemas
>
>
yes
> 2. you want to run autogenerate only once
>
yes
> 3. you want your mirations genrated with None for schema
>
yes
> 4. *HOWEVER*, when you run autogenerate, you are picking *one* (random?
> arbitrary?) schema to use as the target, is that right?
>
yes one, but it won't be arbitrary, it will be a development schema
generated from the latest version (prior to the change we want to
autogenerate).
>
> As it stands, your autogenerate is not going to look in any schema except
> "public", assuming default PG search path, because you did not set
> "include_schemas=True".
>
>
i had it set to True and it behaves the same. i just took it out based on
your previous suggestion, but again, it behaves the same.
If you truly want autogenerate to look at one schema and only that schema,
> and generate everything as non-schema qualified, then I would simply set
> the default schema in PG to that schema name using search_path:
>
> connection.execute("SET search_path TO my_schema")
>
> that way everything Alembic reflects will be from "my_schema" and it will
> see the schema as blank, and it should generate as such. you might need to
> disable the schema translate map when autogenerate runs but try it without
> doing that first.
>
>
it's still generating the entire schema in the revision file.
here's the updated section and it behaves the same with/without schema
translate map:
with connectable.connect() as connection:
# create DB_SCHEMA if it doesn't exist
connection.execute(f'create schema if not exists {DB_SCHEMA}')
# map metadata schema (None) to DB_SCHEMA
# connection =
connection.execution_options(schema_translate_map={None:DB_SCHEMA})
connection.execute(f"set search_path to {DB_SCHEMA}")
# set alembic version table location in DB_SCHEMA
context.configure(
connection=connection,
include_schemas=True,
target_metadata=metadata,
version_table_schema=DB_SCHEMA,
)
with context.begin_transaction():
context.run_migrations()
>
>
> On Thu, Mar 19, 2020, at 7:09 PM, Brian Hill wrote:
>
> Here's my env.py. Thanks for the help.
> Brian
>
> On Thursday, March 19, 2020 at 5:37:38 PM UTC-4, Mike Bayer wrote:
>
>
>
> On Thu, Mar 19, 2020, at 5:30 PM, Brian Hill wrote:
>
> Are there known issues with using autogenerate with multi-tenant
> (schema_translate_map)?
>
>
> it's complicated and not one-size-fits-all, if you consider that to be an
> issue
>
>
>
> My metadata doesn't have a schema and I my
> schema_translate_map={None:'my_schema'}.
>
> This works for migrations but when I use autogenerate the generated
> revision file is the full schema and not the diff.
>
> It's detecting the alembic version table in the tenant schema. If I run
> the autogenerate a second time with the new revision file it fails saying
> Taget database is not up to date.
>
>
> are you setting include_schemas=True in your environment? I'd probably
> not do this. Can't help much more without a complete and concise working
> example of your env.py, please remove all extraneous details.
>
>
>
> Thanks,
>
> Brian
>
>
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> *Attachments:*
>
> - env.py
>
>
>
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