Hello!
I have a base model class with "id" field, which is primary key and also
not nullable. It does not have autoincrement feature, but uses custom
sequence manually to assign it's value.
There are standard on table / sequence naming:
class Base:
id = Column(Integer, primary_key=True, nullable=False)
class A(Base):
__tablename__ = 'a'
class B(Base):
__tablename__ = 'b'
What i need is to do two things:
1. Automatically add sequences to A and B tables (in ORM context, mappers),
named "__tablename__$seq" -> 'a$seq' and 'b$seq'. By sequences i mean an
attribute of type Sequence.
2. Somehow associate it with "id" column, so the sequence can be
automatically created after "create_all()" function call.
I tried to use this approach: Associating a Sequence as the Server Side
Default
(http://docs.sqlalchemy.org/en/latest/core/defaults.html#associating-a-sequence-as-the-server-side-default)
but did not succeed because sequence name is always hardcoded in base
class, but in my case it must be autogenerated based on custom naming rule.
I have spent four hours trying different techniques but did not succeed
with this.
Thanks!
--
SQLAlchemy -
The Python SQL Toolkit and Object Relational Mapper
http://www.sqlalchemy.org/
To post example code, please provide an MCVE: Minimal, Complete, and Verifiable
Example. See http://stackoverflow.com/help/mcve for a full description.
---
You received this message because you are subscribed to the Google Groups
"sqlalchemy" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to sqlalchemy+unsubscr...@googlegroups.com.
To post to this group, send email to sqlalchemy@googlegroups.com.
Visit this group at https://groups.google.com/group/sqlalchemy.
For more options, visit https://groups.google.com/d/optout.
