Thank you for your extensive support! Could it be, that get_scalar() in other classes (especially in the basic ones) simply provide the last available value, if record is None?
I could code it that way, but I am not sure, whether it is a good idea or not. Tom Keffer schrieb am Donnerstag, 18. Februar 2021 um 17:51:45 UTC+1: > Hi, Karen. Looks like you are making steady progress. > > This is a bug in the Belchertown skin that I alluded to in another thread > <https://groups.google.com/g/weewx-user/c/fKVxr07vMuE/m/I-PdDb7vBgAJ>. > > In a convoluted way, the skin is asking for a value from xtypes using the > call > > xtype.get_scalar(obs_type, record, db_manager) > > > (Side note: the actual request is done through a getattr() query of a > weewx.tags.CurrentObj object). > > Unfortunately, the value for record as provided by the Belchertown skin > is None. In theory, the xtypes extension could look up the values it needs > from the database, but that would require knowing the time, but with > record equal to None, that's not possible either. > > The Belchertown skin needs to provide the current record. > > > > > > On Thu, Feb 18, 2021 at 8:39 AM Karen K <kk44...@gmail.com> wrote: > >> My XType extension is working in principle now. It calculates, and it >> delivers values, if there is $current.GTS, $latest.GTS, $day.GTS or >> $yesterday.GTS included in the skin definition. Also, images are >> generated showing the value over time. All is fine so far. >> >> Then I included the value in the Belchertown skin observation list. And I >> got an error message. It turned out, that it is possible that get_scalar() >> is called with *record is None*. From documentation I thought otherwise. >> That was confusing. >> >> As I included "if record is None: raise weewx.CannotCalculate(obs_type)" >> into get_scalar() no error message was logged any more. But no value was >> displayed in Belchertown skin. Again: if I include "$current.GTS" into >> the skin, the value is displayed. If I include the value in the observation >> list in skin.conf, it is not. I looked around and found out that >> Belchertown skin gets the value from calling weewx.tags.CurrentObj()within >> their special extension "belchertown.py" That seems to not include GTS >> value. >> >> So I am not sure what to do next. >> >> -- >> > You received this message because you are subscribed to the Google Groups >> "weewx-development" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to weewx-developm...@googlegroups.com. >> > To view this discussion on the web visit >> https://groups.google.com/d/msgid/weewx-development/bf89f27d-abb4-4943-a2a9-e3ffbf1a8606n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/weewx-development/bf89f27d-abb4-4943-a2a9-e3ffbf1a8606n%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "weewx-development" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-development+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-development/4caf593c-5f43-4c21-bb44-37867f803e52n%40googlegroups.com.
