Ruby-on-rails Rails 迁移:如何使用 ROR 迁移增加列数据类型大小

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时间:2020-09-02 23:26:26  来源:igfitidea点击:

Rails Migration: How to increase column data type size by using ROR migration

ruby-on-railsrubymigration

提问by Sravan Kumar

My users table login column is String type with limit of 40 characters. Now I am planning to increase the limit to 55 characters.

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

Any one please let me know how can we increase this limit by using ROR migration.

任何人请让我知道我们如何通过使用 ROR 迁移来增加此限制。

Thanks, Sravan

谢谢,斯拉文

回答by beesasoh

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

回答by tirdadc

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