Below are some notes which may be helpful when running the Grid1 demo, found here:
http://www.impredicative.com/ur/more/ (1) There are three necessary files which are not mentioned on the above demo page: grid.urp grid.urs grid.ur You can the latest version of these files by cloning UrWeb's Mercurial repository here: http://hg.impredicative.com/urweb (2) Column d of table t is a foreign key referencing table t1. The web app interface does not provide a way to add records to table t1, so you must use psql at the command line to add some records to table t1, before adding any records to table t. (3) When a new record is created in table t via the web app interface, it initially sets column t.d to a default value of 0. So before you create any records in table t, you must use psql to create a record in table t1 having id=0. ###
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