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copied!<pre><code>class Buyer < ActiveRecord::Base scope :positioned_at_or_above, lambda {|pos| where("position >= ?", pos) } def self.increment(amount, position_threshold) Buyer.positioned_at_or_above(position_threshold).each{|buyer| buyer.update_attributes(:position => buyer.position + amount)} end end </code></pre> <p>-</p> <pre><code>increment ∴ rails c Loading development environment (Rails 3.0.3) >> Buyer.count => 0 >> (1..10).each {|idx| Buyer.create(:name => "Buyer ##{idx}", :position => idx)} => 1..10 >> pp Buyer.all [#<Buyer id: 11, name: "Buyer #1", position: 1>, #<Buyer id: 12, name: "Buyer #2", position: 2>, #<Buyer id: 13, name: "Buyer #3", position: 3>, #<Buyer id: 14, name: "Buyer #4", position: 4>, #<Buyer id: 15, name: "Buyer #5", position: 5>, #<Buyer id: 16, name: "Buyer #6", position: 6>, #<Buyer id: 17, name: "Buyer #7", position: 7>, #<Buyer id: 18, name: "Buyer #8", position: 8>, #<Buyer id: 19, name: "Buyer #9", position: 9>, #<Buyer id: 20, name: "Buyer #10", position: 10>] => nil >> pp Buyer.positioned_at_or_above(4) [#<Buyer id: 14, name: "Buyer #4", position: 4>, #<Buyer id: 15, name: "Buyer #5", position: 5>, #<Buyer id: 16, name: "Buyer #6", position: 6>, #<Buyer id: 17, name: "Buyer #7", position: 7>, #<Buyer id: 18, name: "Buyer #8", position: 8>, #<Buyer id: 19, name: "Buyer #9", position: 9>, #<Buyer id: 20, name: "Buyer #10", position: 10>] => nil >> pp Buyer.positioned_at_or_above(4).all [#<Buyer id: 14, name: "Buyer #4", position: 4>, #<Buyer id: 15, name: "Buyer #5", position: 5>, #<Buyer id: 16, name: "Buyer #6", position: 6>, #<Buyer id: 17, name: "Buyer #7", position: 7>, #<Buyer id: 18, name: "Buyer #8", position: 8>, #<Buyer id: 19, name: "Buyer #9", position: 9>, #<Buyer id: 20, name: "Buyer #10", position: 10>] => nil >> Buyer.increment(1000, 4) => [#<Buyer id: 14, name: "Buyer #4", position: 1004>, #<Buyer id: 15, name: "Buyer #5", position: 1005>, #<Buyer id: 16, name: "Buyer #6", position: 1006>, #<Buyer id: 17, name: "Buyer #7", position: 1007>, #<Buyer id: 18, name: "Buyer #8", position: 1008>, #<Buyer id: 19, name: "Buyer #9", position: 1009>, #<Buyer id: 20, name: "Buyer #10", position: 1010>] >> pp Buyer.all [#<Buyer id: 11, name: "Buyer #1", position: 1>, #<Buyer id: 12, name: "Buyer #2", position: 2>, #<Buyer id: 13, name: "Buyer #3", position: 3>, #<Buyer id: 14, name: "Buyer #4", position: 1004>, #<Buyer id: 15, name: "Buyer #5", position: 1005>, #<Buyer id: 16, name: "Buyer #6", position: 1006>, #<Buyer id: 17, name: "Buyer #7", position: 1007>, #<Buyer id: 18, name: "Buyer #8", position: 1008>, #<Buyer id: 19, name: "Buyer #9", position: 1009>, #<Buyer id: 20, name: "Buyer #10", position: 1010>] => nil >> </code></pre>

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