Rails迁移:如何使用ROR迁移来增加列数据类型的大小

Question

我的用户表登录列是String类型,限制为40个字符.现在我计划将限制增加到55个字符.

任何人请告诉我如何通过使用ROR迁移来增加此限制.

谢谢,Sravan

Answer 1

class YourMigration < ActiveRecord::Migration
  def up
    change_column :users, :login, :string, :limit => 55
  end

  def down
    change_column :users, :login, :string, :limit => 40
  end
end

Answer 2

class YourMigration < ActiveRecord::Migration
  def change
    change_column :users, :login, :string, :limit => 55
  end
end