删除列不起作用

Question

我想从我的数据库中删除一列。我跑这个

rails generate RemoveOccupancyFromSpaces occupancy:string 

但后来我收到此错误信息

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

我要去哪里错了吗？

Answer 1

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

这应该产生具有正确的语法文件：

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

Answer 2

尝试rails generate migration RemoveOccupancyFromSpaces occupancy:string