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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