> > Are you suggesting that every time an $alltime tag is called (even if in > the same template?), the entirety of $alltime is re-generated? I guess > that makes sense, but I don't have a grasp on why the values would change. > Unless it has something to do with the Timebinder changing it's time search > and the final array of $alltime isn't really "all time". > >> The function get_extension_list() is called every time a template is processed, whether or not it includes a $alltime tag. So, if you have 13 templates, it will get called 13 times. Because some templates are "to date," while others are for a specific time period (by month, or by year), the "timespan" parameter can vary for each template.
If you look again at the allstats example <http://www.weewx.com/docs/customizing.htm#extending_the_list>, you'll see that all it does in get_extension_list() is build and return TimespanBinder objects. It doesn't actually hit the database. That doesn't happen until Cheetah finds a tag with $alltime in it and, even then, only when the final suffix to $alltime is evaluated (the "max" in $alltime.outTemp.max). -tk
