Rails - Nov 2005 - wrong number of arguments (1 for 0) / composed_of / to_f

Hello. I''m using the Money class (http://rubyforge.org/projects/money)
with composed_of like this...

composed_of :mounted_price, :class_name => "Money", :mapping =>
[ "mounted_price", "cents" ]

That was working fine on its own. I then wanted to add some validation.
Rather than make a separate validation block just for the money field,
I figured I could use the same block as the other numerical fields.
Money objects can''t be compared directly against Fixnums (though I
suppose that could be added) so I used to_f...

validates_each :mounted_price, :edition_size, :height, :width do |model, attrib,
value|
	model.errors.add(attrib, "should be positive") unless value.nil? ||
value.to_f > 0
end

The money class doesn''t have a to_f method so I added one myself...

class Money
	def to_f
		@cents.to_f / 100
	end
end

But with just the addition of that to_f method, whenever
record.mounted_price or record.mounted_price= gets called from Rails,
it throws up ArgumentError: wrong number of arguments (1 for 0). I
tried creating a record and then calling these methods manually from
IRB and that worked fine. The problem only occurs in Rails. Why!?

James

Actually it seems like simply putting...

class Money
end

...has the same effect. What am I doing wrong?

Nevermind! It was simply because of a filename conflict. Not sure why it only 
appeared after extending the class but oh well.