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= New Features
* Model#column_previously_was and #column_previously_changed? have
been added to the dirty plugin, for getting the previous values
of the column before saving and for whether there were changes
before saving.
Model#column_previously_changed? accepts :from and :to options
to allow you to more easily determine if the value changed from
and/or to specific values.
This information was previously obtainable via
Model#previous_changes, but these new methods offer a friendlier
interface.
* Postgres::PGRow::{Array,Hash}Row#op has been added to the
pg_row_ops extension if the pg_row extension is loaded. This
is similar to how the pg_array_ops, pg_hstore_ops, and
pg_json_ops and #op method to their objects. This makes it
easier to perform row operations on literal rows.
= Other Improvements
* The schema_dumper extension now supports more unsigned numeric
types, such as "decimal(7,2) unsigned" and "real unsigned".
* IntegerMigrator now raises an Migrator::Error if attempting to
migrate down when there are migration files missing and needed for
the down migration. Previously, IntegerMigrator would not raise an
exception and would make no database changes in this case.
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