Rails - Jul 2005 - AR collection allows new objects that fail validation?

I''ve got a has_many collection of classes that validated uniqueness  
of one of its fields. When I try to create a new object in this  
collection, the validation fails but the object is added to the  
collection anyways. Is this the expected behavior? If not, how do I  
keep new objects that fail validation out of the collection?

class A
  belongs_to :b
end

class B
  has_many :c
end

class C
   validates_uniqueness_of :name
end

from the rails console I can say:
 >> a = A.find(:first)
=> [#A:0x....]
 >> a.b.c.size
=> 4 (assume one of those records has a name of "don")
a.b.c.create(:name => "don")
=> [#C:0x... ,@errors=...{code="has already been taken"}]
 >> a.b.c.size
=> 5

Since the validation failed, shouldn''t the new C object be kept from  
joining the other C objects?

Don


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