class User
has_many :mads
def mad
Mad.find_by_user_id(id)
end
end
class God
belongs_to :mad
belongs_to :user
belongs_to :sender, :class_name => "User", :foreign_key => "sender_id"
def strange_change!
God.transaction do
puts mad.nil? #the first time put is false
if mad.nil?
puts 'some thing exctue here' #no puts anything
mad = you.mad
end
puts mad.nil? #the second time put is true
end
end
end
why the mad will become nil?
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