I'm trying to bind a param to a join via a named scope., but I'm getting an error.

What is the correct way to do that?

has_one :has_voted, :class_name => 'Vote', :conditions => ['ip = :userIp']

# named scopes
scope :with_vote, lambda {|ip| {
:include => [:has_voted],
# like this ??
:conditions => [:has_voted => {:conditions => {:userIp => ip}} ] 
}}

Idea.with_vote(request.ip).all

I believe I need the condition definition in the model for it to appear in the ON clause of a JOIN, rather then in the WHERE one.

Edit I'm trying to get the following query

select Ideas.*, Votes.* from Ideas 
left outer join Votes 
on Votes.Idea_id = Idea.id AND Votes.ip = {request.ip}