[Rails] why story.votes return Array, but story.votes.create works?

In Ruby on Rails, say a Story object can "has_many" Vote objects (a
story is voted "hot" by many users).

So when we do a

s = Story.find(:first)

"s" is a Story object, and say

s.votes

returns "[]"
and

s.votes.class

returns "Array"

So clearly, s.votes is an empty Array object.

At this time, when

s.votes.create

is called, it actually invokes a method of the Vote class? How come an
Array class object can invoke a Vote class method?
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