Hi all, First proper post to the list. I've been working with Django since shortly after the code was announced, have worked through the tutorials and it's gone pretty smoothly so far. So thanks for making an interesting project available.
Now onto the question :-) (This isn't exactly the scenario I'm trying to do but it's a similar one that people are likely to be familiar with.) I'd like to have an auto incrementing ID field that is unique within a particular subset of the records identified by another field. e.g. if you had a weblog application that supported multiple weblogs you could have posts ID 1, 2 and 3 for weblog ID 1 and posts ID 1,2, and 3 for weblog ID 2 rather than the posts being numbered 1-6. Another similar scenario would be writing a bug tracking application which supports multiple projects and has a separate issue number space for each project. I was thinking of doing this by having a post_number field in the model in addition to the standard id field and then writing a _pre_save() method which would look up the highest ID used so far and assign the next one to the new record. And also possibly adding a unique_together option. Would this be a reasonable way to go about it or can anyone suggest a better solution? Thanks for your help, -Michael
