删除列不起作用

Question

我正在尝试从我的数据库中删除一列。我是运行这个

rails generate RemoveOccupancyFromSpaces occupancy:string

但后来收到此错误消息

Could not find generator 'RemoveOccupancyFromSpaces'. Maybe you meant 'resource_route' or 'devise:controllers' or 'active_admin:page'
Run `rails generate --help` for more options.

我哪里错了？

Answer 1

尝试rails generate migration RemoveOccupancyFromSpaces occupancy:string

Answer 2

正确的语法是rails generate migration RemoveOccupancyFromSpaces occupancy:string

这应该会产生一个语法正确的文件：

class RemoveOccupancyFromSpaces < ActiveRecord::Migration
  def change
    remove_column :spaces, :occupancy, :string
  end
end

删除列不起作用

Removing column is not working

ruby-on-rails

database-migration