How do you fill the items of a DropDown from a data table?

[szybalski]

Thanks. I’ll consider that closer to prod version.

How do I set the dropdown value to blank as a default first value?

In the init section I have this:

self.dropdown_year.items = set([str(row['Year']) for row in app_tables.testcars.search()])

How do I get set the dropdown to be blank first, so that when the user sets it to 1st value , it triggers the
self.dropdown_year_1_change event?

Currently the first value is returned, and the website does not seem to be know something was selected until i changed the value to next item then back to the first value in a selection.

a) In this section you guys indicate you need to set self.drop_down_1.selected_value=“foo”

FYI: DropDown's `selected_value` vs. `text`

Workaround update: selected_value works as intended, if you set it from code first. So if, in your init method, you do: self.drop_down_1.selected_value="foo" …then it all works (assuming "foo" is one of that component’s items). And from then on, selected_value will reflect the value selected in the DropDown. (Obviously, this is just a workaround, and we’ll get the actual bug fixed soon! But I thought I’d tell you how to work around it in the meantime…)

The dropdown with above code does not start at null, but rather at the first item returned.

b) but below causes error saying "

 self.dropdown_year.items = set([str(row['Year']) for row in app_tables.cars.search()])
 self.dropdown_year.selected_value="Please Select Value" 

Could you provide an answer on this, or pointer to docs?

Thanks
Lucas