rake test_firebird has queries using = NULL instead of is NULL

I'm trying to run the regresttion test scripts on a firebird database.
I'm getting a lot of errors where the query being created is using =
NULL in the where clause. One specific place that is fails is as
follows

  1) Error:
test_save_on_parent_saves_children(AssociationProxyTest):
ActiveRecord::StatementInvalid: FireRuby::FireRubyException: Error
preparing a SQL statement.
Dynamic SQL Error
SQL error code = -104
Token unknown - line 1, char 59
NULL
Invalid token
SQL Code = -104
Firebird Code = 335544569
: SELECT * FROM audit_logs WHERE (audit_logs.developer_id = NULL)
    ./../lib/active_record/connection_adapters/abstract_adapter.rb:
128:in `log'
    ./../lib/active_record/connection_adapters/firebird_adapter.rb:
382:in `execute'
    ./../lib/active_record/connection_adapters/firebird_adapter.rb:
612:in `select'
    ./../lib/active_record/connection_adapters/firebird_adapter.rb:
374:in `select_all'
    ./../lib/active_record/base.rb:427:in `find_by_sql'
    ./../lib/active_record/base.rb:999:in `find_every'
    ./../lib/active_record/base.rb:418:in `find'
    ./../lib/active_record/associations/has_many_association.rb:91:in
`find'
    ./../lib/active_record/associations/association_collection.rb:
163:in `find_target'
    ./../lib/active_record/associations/has_many_association.rb:121:in
`load_target'
    ./../lib/active_record/associations/association_proxy.rb:122:in
`method_missing'
    ./../lib/active_record/associations/has_many_association.rb:98:in
`method_missing'
    ./../lib/active_record/callbacks.rb:345:in `callback'
    ./../lib/active_record/callbacks.rb:335:in `callback'
    ./../lib/active_record/callbacks.rb:330:in `each'
    ./../lib/active_record/callbacks.rb:330:in `callback'
    ./../lib/active_record/callbacks.rb:255:in
`create_without_timestamps'
    ./../lib/active_record/timestamp.rb:30:in `create'
    ./../lib/active_record/base.rb:1793:in
`create_or_update_without_callbacks'
    ./../lib/active_record/callbacks.rb:242:in `create_or_update'
    ./../lib/active_record/base.rb:1549:in `save_without_validation'
    ./../lib/active_record/validations.rb:752:in
`save_without_transactions'
    ./../lib/active_record/transactions.rb:129:in `save'
    ./../lib/active_record/connection_adapters/abstract/
database_statements.rb:59:in `transaction'
    ./../lib/active_record/transactions.rb:95:in `transaction'
    ./../lib/active_record/transactions.rb:121:in `transaction'
    ./../lib/active_record/transactions.rb:129:in `save'
    ./../lib/active_record/base.rb:451:in `create'
    associations_test.rb:110:in `test_save_on_parent_saves_children'

This line in the test is doing something like this

developer = Developer.create :name => "Bryan" :salary => 50_000

Firebird uses the prefetch sequence generate stuff and I know that a
sequence number has been fetched but for whatever reason in the create
when it's trying to load the associations it's trying to query = NULL
instead of the actually id of the class. Can someone point me in the
right direction of something to look at to correct this problem.

Thanks,
Scott Knight

This seems like the same problem described on http://dev.rubyonrails.org/ticket/8713
but it doesn't seem to be fixed for firebird. The problem seems to be
right before it can send construct_sql to the association it
calls .blank? on the association which then causes the proxy to
load_target on them which runs the query with = NULL in it

-Scott