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ActiveRecord::Migration で string のカラムをデータごと integer に変換する

Last updated at Posted at 2018-04-05

間違えて string(=varchar) で定義したカラムを、
データのコンバート込みで integer(=int4) にしたい時の小技。

def up
  change_column :reports, :file_size, 'integer USING CAST(file_size AS integer)'
end

def down
  change_column :reports, :file_size, :string
end
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