Using a different schema for the same declarative Base in sqlalchemy

Question

I am new to both Pyramid and SQLAlchemy. I am working on a Python Pyramid project with SQLAlchemy. I have a simple model set up below. How would I go about being able to use

Answer 1

I think you need a different model for each schema. __abstract__ can make this less painful. This follows on to Paul Yin's answer...

1. Define an __abstract__ LoadTender model, so you don't have to keep coding it.

   #base.py
   class LoadTender(Base):
       __abstract__ = True
       id = ...
       def __repr__ ...
   

2. Put a schema-specific Base in the hierarchy for each schema.

   #schema1.py
   from base import LoadTender
   
   PublicBase = declarative_base(metadata=MetaData(schema='public'))
   
   class LoadTender(PublicBase, LoadTender):
       __tablename__ = 'load_tenders'
   

3. Do the same for other schema.

Answer 2

just a guess

LoadTender.__table_args__["schema"] = "whatever"

Probably best to put it somewhere where your app configurator is creating the app

Answer 3

You can have a base module in package model

app\
    models\
        base.py
        schema1.py
        schema2.py
    views\
    ...

declare Base in base.py, then import it to other schemas