On Thu, Sep 7, 2023, at 4:39 AM, zedr...@gmail.com wrote: > > *Is there a clean way to (programmatically) duplicate all relationship from > an existing model, over to a new model (that targets the same table and > selects a subset of columns as a subquery)?*
relatonships are fixed to their parent class and have internal state that is dependent on it, so it can't be shared between two unrelated classes. you would need to introspect the attributes of each relationship that are important to the application, such as the target class etc., and create a new relationship() that has those attributes. Assuming the relationships dont have special join conditions, this would involve just looking for existing_class.__mapper__.attrs.relationship.entity, which is the mapper to which it refers, and placing this into a new relationship(). > -- 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 view this discussion on the web visit https://groups.google.com/d/msgid/sqlalchemy/3c23e775-f2d1-487d-8f5d-e7785399aeba%40app.fastmail.com.
