Fix #45 correctly reinstate nullable unique constraints #47
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Ensure that the unique/unique_together constraint which is reinstated, is exactly the same as the one that was dropped earlier on in
_alter_field
before e.g. altering the column type.This fixes both cases described on the bug report, i.e. when
AlterField
modifies a column which is:unique=True
as well asnull=True
unique_together
where at least 1 column is nullableFirst commit adds tests for both cases which fail without the fix & pass with it.