PGError "unknown column" on polymorphic association column

Hi all !

This is very strange. I am attempting to get my application running
on PostgreSQL (from MySQL), and I get this error:

ActiveRecord::StatementInvalid: PGError: ERREUR: la colonne «Party»
n'existe pas
: SELECT * FROM contact_routes WHERE (routable_type = "Party" AND
routable_id = 1000013) ORDER BY position DESC LIMIT 1
    /home/francois/src/xlsuite.org/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract_adapter.rb:128:in
`log'
    /home/francois/src/xlsuite.org/vendor/rails/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb:152:in
`execute'
    /home/francois/src/xlsuite.org/vendor/rails/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb:433:in
`select'
    /home/francois/src/xlsuite.org/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb:7:in
`select_all'
    /home/francois/src/xlsuite.org/vendor/rails/activerecord/lib/active_record/base.rb:427:in
`find_by_sql'
    /home/francois/src/xlsuite.org/vendor/rails/activerecord/lib/active_record/base.rb:997:in
`find_every'
    /home/francois/src/xlsuite.org/vendor/rails/activerecord/lib/active_record/base.rb:991:in
`find_initial'
    /home/francois/src/xlsuite.org/vendor/rails/activerecord/lib/active_record/base.rb:417:in
`find'

It translates to "The Party column does not exist". I ran the
statement in psql, and sure enough, I get the same error. If I quote
the routable_type column's value using single-quotes, I get the
expected results.

My models look like this:

class Party < AR::B
  has_many :contact_routes, :as => :routable
end

class ContactRoute < AR::B
  acts_as_list
  belongs_to :routable, :polymorphic => true
end

I'm on the 1.2 stable branch, using Ruby 1.8.4 and PostgreSQL 8.1.

Thanks !