[Interest] Sorting numbers in QSortFilterProxyModel with QSqlTableModel source

[Michael Vlach]

By default QSortFilterProxyModel can sort few different types using
QVariant::type to see what is in it to do the correct sort. However when
the QSqlTableModel as a source model for the proxy then this always
evaluates to QString (the default) and thus sorting numbers as strings. I
wrote my own subclass of the filter model to force sorting by number but I
wonder if there is a way to tell the QSortFilterProxyModel by what type it
should sort explicitly? I am pretty sure that the problem is
with QSqlTableModel disregarding the types of fields in the database (or
QSqlQuery/QSqlDatabase behind it).
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