For some reason you are dealing with a Java object instead of a ruby 
object. I posted about troubleshooting this earlier, but I'm not sure if 
you tried this, so let's try again.

To troubleshoot, try to put together the simplest example:

  DB = Sequel.connect("jdbc:postgresql://...")
  DB.extension :pg_hstore
  p DB.get(Sequel.lit("'a=>b'::hstore")).class

If that doesn't print Sequel::Postgres::HStore, then that is a problem.  In 
that case, run this code to get the hstore oid:

  p DB.from(:pg_type).where(:typtype=>'b', 
:typname=>'hstore').select_map([:oid, :typname])

Also, run this code to get the schema for the table:

  p DB.schema(:table_name)

Post the results here and hopefully we can find the underlying issue.

Thanks,
Jeremy

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