Problem using ActiveResource "find" with conditions

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I can't get ActiveResource find to return the correct results when passing through conditions.

According to the documentation I've read, conditions should be specified with the :params symbol, like this:

Address.find(:all, :params => {:user_id => 2})

But when I do this I get returned all results rather than just those ones that satisfy the constraint.

My underlying models on the server are:

class User < ActiveRecord::Base
  has_many :addresses
end

class Address < ActiveRecord::Base
  belongs_to :user
end

and the test data contains 2 users and 2 addresses, with both of the addresses mapped to user 1 like this:

So,

Address.find(:all, :params => {:user_id => 2})

should return me nothing, but instead it returns me both address 1 and address 2, like what is returned with these queries:

Address.find(:all)
Address.find(:all, :params => {:user_id => 1})

i.e. it's like the :params attribute is being completely ignored.

Ok, so maybe :params is the wrong symbol? For ActiveRecord we should use :conditions to specfiy constraints - let's try that instead.

Address.find(:all, :conditions => {:user_id => 2})

But I just get the same result as before. i.e. all addresses, not just those with user_id = 2

So what can be wrong? Is ActiveRecord broken, or am I just using the wrong symbol to restrict my find query?

rails | ActiveResource | find | conditions

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