Ruby 里表的增删改查

官网链接： Active Record Migrations --- Ruby on Rails Guides

添加string字段

rails g migration AddFieldIdToTables field_id:string

添加boolean(tinyint)字段

rails g migration AddFieldFlagToTables field_flag:boolean

添加text字段

rails g migration AddFieldJsonToTables field_json:text

添加Integer字段

rails g migration AddFieldDaysToTables field_days:integer

删除string 字段

rails g migration RemoveEmailFromTables email:string

重命名Text字段为Integer(不建议修改数据类型，耗时较长，建议删除再新建)

rails g migration RenameFieldFromTables

class RenameFieldFromTables < ActiveRecord::Migration[5.2]
  def change
    rename_column :tables, :field, :field_id
    change_column :tables, :field_id, :integer
  end
end

好了之后不用忘记运行：

rake db:migrate