My problem scenario is analogous to the following. I have an Artist table and an Album table. Each artist can have multiple albums with sales of each album. The artist also has a total_sales column which is basically a cumulative of album's sales for that artist. I tried reading about attribute events and memoized property but I am unable to get it integrated with my code. I tried to achieve something like https://groups.google.com/forum/?fromgroups#!topic/sqlalchemy/o_KxuHwz4WQ. But my lack of thorough understanding of decoraters and sqlalchemy is proving to be a hindrance. My example code (heavily borrowed from resources on internet and sqlalchemy group) is http://pastebin.com/vhRTcrWV Just for information if at all it matters:n my actual code I am using toscawidgets (inside turbogears) and dynamic forms for creating Albums table's values and Artist's values on a single page.
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