DataSource.ensure_loaded()

Read every pin this source has not read yet.

Usage

Source

DataSource.ensure_loaded()

A board source loads a pin when a query names it, and that recovery lives on query(). A measure is handed the connection itself and never goes through query(), so nothing there would trigger the read and the measure would fail on a relation that does not exist yet. source_ensure_all() in pkg-r/R/data-source.R is the same step for the same reason. A source with nothing pending, which is every source that is not board-backed, does nothing.