Rails - Sep 2009 - OR conditions on has_and_belongs_to_many?

Hi,

I wonder how I can insert "OR" in has_and_belongs_to_many conditions?

Code:
has_and_belongs_to_many :projects, :conditions =>
["projects_users.user_id = 0"]

Console:
user.projects

SQL:
 Project Load (0.3ms)   .... WHERE ("projects_users".user_id = 1 AND
(projects_users.user_id = 0))

I wonder if I can change AND to OR

Thanks for help :D
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I know I can do it with LIKE :)
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