ruby-on-rails - Rails 迁移 : Remove column from table

Question

我正在尝试使用 Rails 迁移从我的表中删除一些属性，我创建了迁移文件并编写了以下代码:

class RemoveCompanySendReportAttributes < ActiveRecord::Migration[5.1]
  def change
    remove_colmun :companies, :time_limit_for_sending_report, :integer
    remove_column :companies, :automatically_send_report, :boolean
  end
end

它不起作用，这是我终端中的错误:

Please register a mime type using register_mime_type then use register_compressor or register_transformer. https://github.com/rails/sprockets/blob/master/guides/extending_sprockets.md#supporting-all-versions-of-sprockets-in-processors (called from block in at /home/sa7noun/altagem-project/web/config/initializers/haml.rb:24) == 20180412151847 RemoveCompanySendReportAttributes: migrating ================ -- remove_colmun(:companies, :time_limit_for_sending_report, :integer) rake aborted! StandardError: An error has occurred, this and all later migrations canceled:

undefined method `remove_colmun' for

Answer 1

第 1 部分

Please register a mime type using register_mime_type then use register_compressor or register_transformer.

这是一个 sprockets 问题，快速修复是

gem 'sprockets', '3.6.3'

但现有的将适用于生产环境。

第 2 部分

remove_column 的迁移错误你写了 remove_colmun 这是错误的类型，这就是原因

undefined method `remove_colmun' for

它将是 remove_column

当你删除一个列时，你不需要提及字段类型，如 integer 或 boolean 或等等...只是简单地

remove_column :companies, :time_limit_for_sending_report

在 Gemfile 中进行任何更新后，请确保运行 bundle install 或 update