Re: [sqlalchemy] discriminator_on_association example and association proxies
Hey Michael, Thanks for the speedy response. I went ahead and changed my implementation using the table_per_association example and everything works great. On Tuesday, 2 April 2013 16:49:14 UTC-4, Michael Bayer wrote: the Customer.comments attribute proxies through comment_association which is configured as a scalar.this should probably be improved in this particular recipe, but for starting assignment you need to assign a collection first: c1 = Customer() c1.comments = [] I don't ever use discriminator_on_association, it's the most awkward and least efficient recipe; it's only there to show an improvement over what Django and Rails do. In practice, I typically advise table_per_assocation; the use case of being able to trace back everything that's tagged back to the parents polymorphically is not needed much in practice. On Apr 2, 2013, at 3:45 PM, bruk.habtu bruk@gmail.com javascript: wrote: I was attempting to implement the example shown in https://github.com/ContextLogic/sqlalchemy/blob/master/examples/generic_associations/discriminator_on_association.py trace: https://gist.github.com/brukhabtu/2294f0873830243845db my code: https://gist.github.com/brukhabtu/1423c9825252ddcf85a5 Customer model inherits CommentMixin. Error occurs when appending to the customer's comments customer.comments.append(comment) The trace shows that the error happens in associationproxy.py return self._scalar_get(getattr(obj, self.target_collection)) obj is a Customer model object and self.target_collection is a string with the value 'comment_association'. The attribute exists but is set to None. -- 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+...@googlegroups.com javascript:. To post to this group, send email to sqlal...@googlegroups.comjavascript: . Visit this group at http://groups.google.com/group/sqlalchemy?hl=en. For more options, visit https://groups.google.com/groups/opt_out. -- 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 http://groups.google.com/group/sqlalchemy?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
[sqlalchemy] discriminator_on_association example and association proxies
I was attempting to implement the example shown in https://github.com/ContextLogic/sqlalchemy/blob/master/examples/generic_associations/discriminator_on_association.py trace: https://gist.github.com/brukhabtu/2294f0873830243845db my code: https://gist.github.com/brukhabtu/1423c9825252ddcf85a5 Customer model inherits CommentMixin. Error occurs when appending to the customer's comments customer.comments.append(comment) The trace shows that the error happens in associationproxy.py return self._scalar_get(getattr(obj, self.target_collection)) obj is a Customer model object and self.target_collection is a string with the value 'comment_association'. The attribute exists but is set to None. -- 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 http://groups.google.com/group/sqlalchemy?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
Re: [sqlalchemy] discriminator_on_association example and association proxies
the Customer.comments attribute proxies through comment_association which is configured as a scalar.this should probably be improved in this particular recipe, but for starting assignment you need to assign a collection first: c1 = Customer() c1.comments = [] I don't ever use discriminator_on_association, it's the most awkward and least efficient recipe; it's only there to show an improvement over what Django and Rails do. In practice, I typically advise table_per_assocation; the use case of being able to trace back everything that's tagged back to the parents polymorphically is not needed much in practice. On Apr 2, 2013, at 3:45 PM, bruk.habtu bruk.ha...@gmail.com wrote: I was attempting to implement the example shown in https://github.com/ContextLogic/sqlalchemy/blob/master/examples/generic_associations/discriminator_on_association.py trace: https://gist.github.com/brukhabtu/2294f0873830243845db my code: https://gist.github.com/brukhabtu/1423c9825252ddcf85a5 Customer model inherits CommentMixin. Error occurs when appending to the customer's comments customer.comments.append(comment) The trace shows that the error happens in associationproxy.py return self._scalar_get(getattr(obj, self.target_collection)) obj is a Customer model object and self.target_collection is a string with the value 'comment_association'. The attribute exists but is set to None. -- 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 http://groups.google.com/group/sqlalchemy?hl=en. For more options, visit https://groups.google.com/groups/opt_out. -- 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 http://groups.google.com/group/sqlalchemy?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
