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Fixed #35336 -- Addressed crash when adding a GeneratedField with % literals. #18027
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The crux of the issue here is that
%
escaped (%
->%%
) which mean that things were working properly during model creation unless the model included a database default which resulted intable_sql
returningparams
and then interpolation kicked (see theparams or None
increate_model
). As foradd_field
it systematically crashed because a list was always passed toexecute(params)
which triggered interpolation which is what is what was reported on ticket-35336.PostgresSome backends simply don't support parametrized DD so we should likely have a generic feature flag for it and do thequote_value
dance when it's not the case in a single location. That would require changing theConstraint
interfaces though as it currently return already interpolated SQL under some circumstances.