i'm understand right now, thank you so much for your detail explaination. On Sun, May 15, 2011 at 5:02 AM, Anthony <abasta...@gmail.com> wrote:
> On Saturday, May 14, 2011 5:37:39 PM UTC-4, 黄祥 wrote: >> >> hi, >> >> is there anyone can explain about the usage of default? >> >> e.g. on http://web2py.com/book/default/chapter/03#Adding-CRUD >> db.comment.image_id.default = image.id > > > You can read about it here: > http://web2py.com/book/default/chapter/06#Record-Representation > > It sets the default value for a field for when an insert is done without > specifying any value, and it is also used to pre-populate SQLFORM fields. > You can specify it when you define your table, but you can also change it at > other points in your code (e.g., you may specify a default where the table > is defined in your model file, but then later change the default in a > controller function). In the example above, it looks like it's being used to > pre-populate the crud form with the currently selected image. > > Anthony >
