#STUFF

Query array of hstore

select * from TABLE where TERM = ALL (SELECT unnest(COLUMN)->HSTORE_KEY);

Add scope using array of hstore

scope :where_any, ->(key, value) { where("? = ANY (SELECT unnest(\"items\") -> ?)", value, key) }
scope :where_all, ->(key, value) { where("? = ALL (SELECT unnest(\"items\") -> ?)", value, key) }