问Rails会将db值增加1

EN

before_save :increase_position

def increase_position
  self.position += 1
end

before_create :set_position
after_destroy :fix_positions

def set_position
   self.position = Page.count + 1
end

def fix_positions
  Page.order('position asc').all.each_with_index do |page, index|
    page.update_attribute(:position, index + 1) unless page.position == index + 1
  end
end