Review caught that this reissued getByRoleName's query instead of
calling it, so it passed whether or not the production line still said
what it was supposed to — a test named for a change it did not touch.
It calls getByRoleName now, and restoring the hand-written clause fails
it for exactly the reason this PR exists: with the marker non-null,
"deleted_at is null" matches nothing and the query returns an empty
list.
Two things in front of the unique-index work, both safe on their own.
getSysMenuByRoleName carried "deleted_at is null" in its where clause.
GORM adds that condition itself for a model with a DeletedAt field, so
it was a duplicate — and one phrased as a column being null, which stops
being true the moment the column stops being nullable. A schema that
moves to a non-null delete marker would have turned this query into one
that matches nothing, silently, for admin users only.
SysDictType.Insert dropped the error from its duplicate check: a query
that failed left the count at zero and the insert went ahead as though
the name were free.
The test pins what the removed clause was there for. Its counter-proof
is Unscoped rather than deleting the field — taking ModelTime off the
model fails to compile, which proves nothing.
zhangwenjian