Hi,

There's been lots of activity in the postgresql world in the past couple 
years. Arrays, hstores, ranges, json, etc. AR's postgresql adapter in 4.0 
will have support for mapping ruby types to custom postgresql types 
(https://github.com/rails/rails/pull/4775). 

I've noticed that sequel, AR's postgresql adapter, and 
jdbc-activerecord-postgres all contain similar, but different parsers for 
handling those postgresql datatypes. Each of the ORMs have their own 
plugins for arrays, hstores, etc.

https://github.com/jruby/activerecord-jdbc-adapter/blob/master/lib/arjdbc/postgresql/adapter.rb
https://github.com/rails/rails/blob/master/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb#L119
https://github.com/jeremyevans/sequel/blob/master/lib/sequel/adapters/postgres.rb#L86

It seems like having a single gem for handling the postgresql parser code 
would be helpful.  Maybe this could be done before ActiveRecord 4.0?

Thoughts?

Joe

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