According to Tonkpils/activerecord-postgres-hstore@7284b8b and version '0.7.0' of the activerecord-postgres-hstore gem, their monkey patch of active record has been removed and support for . This causes the monkeypatch this gem does for compatibility to break.
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Feb 15, 2013
h3. Compatibility with activerecord-postgres-hstore
+As of activerecord-postgres-hstore '0.7.0', @ActiveRecord::Base#arel_attributes_value@ is not monkey patched and therefore does not interfere with loading of this gem.
+If you are using '0.6.0', or earlier, of activerecord-postgres-hstore you must use this gem's version '0.0.8' and the following still applies:
activerecord-postgres-hstore and activerecord-postgres-array both monkeypatch @ActiveRecord::Base#arel_attributes_values@, which leads to problems if these gems are used together. This gem is aware of activerecord-postgres-hstore and incorporates it in the monkeypatch. However, it is important that activerecord-postgres-array is loaded _after_ activerecord-postgres-hstore for this to work.