[Rails] attributes= operation *appends* instead of replacing for accepts_nested_attributes_for with has_many

When using "attributes=" for an object with a accepts_nested_attributes_for a model

that has a has_many relationship will cause the has_many array to be appended-to

instead of being replaced as would be expected by a straight assignment operation.

See this example:

class Member < ActiveRecord::Base

  has_many :posts

  accepts_nested_attributes_for :posts

end

class Post < ActiveRecord::Base

  belongs_to :member

end

m=Member.new

p={:name => 'joe', :posts_attributes => [{:title=>'t1'},{:title=>'t2'}]}

m.attributes = p

m.posts.size ----> 2

m.attributes = p

m.posts.size ----> 4

Is this a feature or a bug?  If it is a feature, how is it supposed to be used?

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