Ruby on Rails

I would like to know which "has_many" associations my ActiveRecord model
has.

Example, given this model:

class Post < ActiveRecord::Base
has_many :comments
end

I need a method that does this:

@associations = Post.has_many_associations

@association.each do |a|
puts a # should print "comments"
end

Can you help me ? This method exists ? Is it possible ?
Thanks
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