Question

我正在尝试运行迁移，但我一直收到错误消息。

我们尝试删除迁移内容，只留下以下内容：

class CreateUsers < ActiveRecord::Migration
  def change      
  end
end

仍会导致错误消息：

$ be rake db:migrate
== 20160619232005 CreateUsers: migrating ======================================
-- create_table(:users)    -> 0.0042s
== 20160619232005 CreateUsers: migrated (0.0043s) =============================

rake aborted! 
  StandardError: An error has occurred, this and all later migrations canceled:

wrong number of arguments (given 1, expected 0) 
/home/ericmarche/.rbenv/versions/2.3.1/bin/bundle:22:in `load' 
/home/ericmarche/.rbenv/versions/2.3.1/bin/bundle:22:in `<main>' ArgumentError: wrong number of arguments (given 1, expected 0) 
/home/ericmarche/.rbenv/versions/2.3.1/bin/bundle:22:in `load' 
/home/ericmarche/.rbenv/versions/2.3.1/bin/bundle:22:in `<main>' Tasks: TOP => db:migrate (See full trace by running task with --trace)

Answer 1

您可以使用以下方法删除整个内容：

class Student < User
  has_and_belongs_to_many :teachers, join_table: :students_teachers
end

然后重新创建它，然后尝试重新迁移：

rails d model user

OR

您可以转到rails控制台并删除users表并重新迁移

rails g model user
rake db:migrate

然后尝试重新移植表

Answer 2

您是否尝试创建新项目并运行

bundle exec rake db:migrate

Answer 3

您使用be rake db:migrate运行迁移的原因 be的意思是什么。

在项目目录中运行迁移而不使用be

等rake db:migrate

例：

$cd workspace/project

workspace/project$ rake db:migrate

rake db：migrate抛出的参数数量错误

3 个答案: