I use dynamic constructor for class.
It works fine for instance who have not foreign keys. But when FK on 
another instance it cannot load them

class left (Base):
  id = sqlalchemy.Column(UUID, primary_key = True)
  def __getattr__(self, attribute):
    if attribute == 'rights':
      return getattr(self, attribute)

class right(Base):
  id = sqlalchemy.Column(UUID, primary_key = True)
  def __getattr__(self, attribute):
    if attribute == 'left':
      rel_key = sqlalchemy.Column(UUID, sqlalchemy.ForeignKey(left.mRID), 
nullable = True)
      setattr(self.__class__, 'left_mRID', rel_key)
      setattr(self.__class__, 'left', sqlalchemy.orm.relationship(left,\
               foreign_keys = rel_key, uselist = False,\
               backref = sqlalchemy.orm.backref('rights', uselist = True)))
      return getattr(self,attribute)      

left_1 = session.query(left).first()
print (str(left_1.rights))

Not works:
right_1 = session.query(right).first()
print (str(right_1.left))
I think that it may be fix them, but i need universal for all 
class right(Base):
  def __getattr__(self, attribute):
    session.refresh(self, attribute_names = ['left_mRID'])

SQLAlchemy - 
The Python SQL Toolkit and Object Relational Mapper


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.

Reply via email to