Users have many invitations and Invitations belongs_to a User.  In the
user model:

  has_many  :open_invitations,
            :class_name => 'Invitation',
            :conditions => "completed_at IS NULL AND is_closed = 'f'"

This works for SQLite3.  But as a literal string this will fail if the
boolean values are different in another db system like MySQL, right?
How can I use a boolean in a condition that will work across all db
types?
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