I would like add a global filter to all queries emitted against a particular table. In particular, its important that it doesn't *require* changes to existing queries; and it would be nice if there was an escape hatch.
I'm aware of the following 2 recipes that googling this returns: https://bitbucket.org/zzzeek/sqlalchemy/wiki/UsageRecipes/PreFilteredQuery https://bitbucket.org/zzzeek/sqlalchemy/wiki/UsageRecipes/GlobalFilter GlobalFilter seems to be the way to implement the escape hatch, e.g. `.options(OmitGlobalFilter())`, or somesuch PreFilteredQuery at first seems to be exactly what I want for applying the filter without changing existing queries, but only appears to work when it is directly queried against, and not for relationships. class Parent(Base): __tablename__ = 'parent' id = Column(types.Integer, primary_key=True) children = relationship('Children', lazy='selectin') # or lazy=joined, or whatever class Child(Base): __tablename__ = 'child' id = Column(types.Integer, primary_key=True) parent_id = Column(ForeignKey('parent.id'), nullable=False) class OmitCertainIds(Query): # ... the beginning portion of PreFilterQuery def _apply_filter(self): mzero = self._mapper_zero() if mzero is None or mzero.class_ != Children: return self return self.enable_assertions(False).filter(Parent.id.in_([1, 2])) # ... # This works great! db.query(Child).all() # This does not apply that filter db.query(Parent).all()[0].children Is there a way to globally filter queries which return Child rows (such as though that relationship, where its not an explicit `.query` call)? Or does this require adjusting all such relationships, or other means by which sqlalcemy may emit queries without a direct query. -- 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.
