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qelectrotech-source-mirror/sources
ispyisail 44ed01ff5d Don't let the wiring list lose a wire to the diagram join
The comment above this view promised that it "returns exactly as many rows
as the conductor table holds", and argued carefully for the two joins that
could have broken that -- no inner join to element, and element_info LEFT
joined. Then it ended with an inner join to diagram that it never mentioned,
which can drop rows just as easily.

Feeding the real schema a conductor whose diagram_uuid has no diagram row
returned 2 view rows for 3 conductors. With the join made LEFT it returns 3,
with a null folio instead of a missing wire.

In practice this should never fire: QETProject::diagramAdded is connected to
addDiagram(), so the folio exists before anything can be drawn on it. But an
inner join turns that into an assumption the view enforces silently, and of
all the things this view can get wrong, dropping a wire from a wiring list
is the one that matters most. The comment now says which joins are inner and
why those two are safe.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-08-21 20:44:16 +12:00
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