Lea H wrote: > Hi all, > I wanted to ask if there is a way to add many to many relationships to > the database every time a new object is inserted. > I have a Question that has a many to many relationship to AnswerCode. > Every time I create and insert a new Question I'd like to add the > corresponding answer codes to that question. > I tried with the decorators @before_insert and @after_insert, but > neither worked. So I wondered if there is a decent way to do that > without having to explicitly add the answer codes after creating the > question.
before_insert() and after_insert() are places where you can only affect the current row, unless you want to issue INSERT statements of additional rows explicitly without the unit of work being involved. To affect the overall unit of work within a flush, you'd use SessionExtension.before_flush(), where you can poke around for things that are new or dirty and add additional things to the session before the flush actually starts. However both are more complicated than just implementing this logic within Question which I'd argue is the appropriate place for it. Implement the addition of AnswerCode objects to the Question object within the constructor (i.e. __init__ method) of Question. > > Cheers, > Lea > > -- > > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To post to this group, send email to sqlalch...@googlegroups.com. > To unsubscribe from this group, send email to > sqlalchemy+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/sqlalchemy?hl=. > > > -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=.
