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我有一个名为items的表。我想为9个对象更改description属性(它是一个文本属性)。具体而言,这些对象是Item的子类 - 称为Juice。所以项目表是STI。以下是该项目的示例说明:尝试使用gsub更改属性时出现迁移问题
将所有支出提高20%。
现在,当我尝试运行以下迁移时,无法获取dang描述来更新。有任何想法吗? (Rails的版本是2.3.11。)
class ModifyItemJuiceDescription < ActiveRecord::Migration
def self.up
juices = Juice.all
Juice.transaction do
for j in juices do
puts "Juice description is: #{j.description}."
j.description.gsub!('payouts', 'winnings')
puts "Juice description will be saved as: #{j.description}."
j.save!
puts "Juice description is now: #{j.description}."
puts "======================================================"
end
end
end
def self.down
juices = Juice.all
Juice.transaction do
for j in juices do
puts "Juice description is: #{j.description}."
j.description.gsub!('winnings', 'payouts')
puts "Juice description will be saved as: #{j.description}."
j.save!
puts "Juice description is now: #{j.description}."
puts "======================================================"
end
end
end
end
那就是它!你摇滚 – keruilin 2011-03-19 15:07:38