Delivery status always says: "never sent"

[catmando]

which also means that the button that says "send only to those who have not got the message yet" doesn't work.

[shapeyourbits]

Trying to test this by sending a message resulted in only one of two messages sending and now viewing the message shows:

ActiveRecord::PreparedStatementInvalid in Admin/messages#show
Showing vendor/extensions/reader/app/views/admin/messages/show.html.haml where line #54 raised:
wrong number of bind variables (1 for 2) in: NOT readers.id IN (?,?)

line #54:
= radio_button_tag 'delivery', 'unsent', false, :id => 'delivery_to_unsent', :disabled => @message.undelivered_readers.empty?

/vendor/radiant/vendor/rails/activerecord/lib/active_record/base.rb:2437:in raise_if_bind_arity_mismatch' /vendor/radiant/vendor/rails/activerecord/lib/active_record/base.rb:2389:inreplace_bind_variables'
/vendor/radiant/vendor/rails/activerecord/lib/active_record/base.rb:2380:in sanitize_sql_array' /vendor/radiant/vendor/rails/activerecord/lib/active_record/base.rb:2269:insanitize_sql'
/vendor/radiant/vendor/rails/activerecord/lib/active_record/base.rb:1528:in `merge_conditions'

...