ruby-on-rails – Rails db：迁移中止…不确定为什么或如何修复

发布时间：2020-12-17 04:21:25 所属栏目：百科来源：网络整理

导读：所以我对Rails真的很新,而且我得到一个我不明白的奇怪错误.我创建了一个Event模型,我想将它迁移到我的数据库.但是,当我运行bundle exec rake db：migrate –trace时,这就是我得到的： 05:55 PM movienights: bundle exec rake db:migrate --trace** Invoke d

所以我对Rails真的很新,而且我得到一个我不明白的奇怪错误.我创建了一个Event模型,我想将它迁移到我的数据库.但是,当我运行bundle exec rake db：migrate –trace时,这就是我得到的：

05:55 PM movienights: bundle exec rake db:migrate --trace
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
** Invoke db:load_config (first_time)
** Invoke rails_env (first_time)
** Execute rails_env
** Execute db:load_config
** Execute db:migrate
==  CreateEvents: migrating ===================================================
-- create_table(:events)
rake aborted!
An error has occurred,all later migrations canceled:

    undefined method `name' for #<ActiveRecord::ConnectionAdapters::TableDefinition:0x007ffa75a27660>
    Documents/Homework/College/2011-2012/Rails/RailsApps/movienights/db/migrate/20120331213639_create_events.rb:4:in `block in change'
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/connection_adapters/abstract/schema_statements.rb:160:in `create_table'
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:432:in `create_table'
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:450:in `block in method_missing'
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:424:in `block in say_with_time'
    .rvm/rubies/ruby-1.9.2-p318/lib/ruby/1.9.1/benchmark.rb:295:in `measure'
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:424:in `say_with_time'
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:444:in `method_missing'
    Documents/Homework/College/2011-2012/Rails/RailsApps/movienights/db/migrate/20120331213639_create_events.rb:3:in `change'
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:393:in `block (2 levels) in migrate'
    .rvm/rubies/ruby-1.9.2-p318/lib/ruby/1.9.1/benchmark.rb:295:in `measure'
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:393:in `block in migrate'
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/connection_adapters/abstract/connection_pool.rb:118:in `with_connection'
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:377:in `migrate'
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:512:in `migrate'
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:704:in `block (2 levels) in migrate'
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:761:in `call'
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:761:in `ddl_transaction'
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:703:in `block in migrate'
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:684:in `each'
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:684:in `migrate'
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:554:in `up'
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/migration.rb:535:in `migrate'
    .rvm/gems/ruby-1.9.2-p318/gems/activerecord-3.2.2/lib/active_record/railties/databases.rake:153:in `block (2 levels) in <top (required)>'
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `call'
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `block in execute'
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `each'
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `execute'
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
    .rvm/rubies/ruby-1.9.2-p318/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/task.rb:144:in `invoke'
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:116:in `invoke_task'
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block (2 levels) in top_level'
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `each'
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block in top_level'
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:88:in `top_level'
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:66:in `block in run'
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run'
    .rvm/gems/ruby-1.9.2-p318/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>'
    .rvm/gems/ruby-1.9.2-p318/bin/rake:19:in `load'
    .rvm/gems/ruby-1.9.2-p318/bin/rake:19:in `<main>'
    Tasks: TOP => db:migrate

当我运行bundle exec rake时,我得到：

You have 1 pending migrations:
  20120331213639 CreateEvents
Run `rake db:migrate` to update your database then try again.

我的创建事件迁移是：

class CreateEvents < ActiveRecord::Migration
  def change
    create_table :events do |t|
      t.name :string
      t.date :datetime
      t.location :string

      t.timestamps
    end
  end
end

但是,我使用rails destroy scaffold事件删除了事件模型,并使用不同的属性再次创建它.这可能是问题的一部分吗？

任何帮助或建议都非常感谢！

解决方法

在迁移中声明属性的顺序错误.它应该是：

t.string :name

您的其他属性也是如此.还要将date属性重命名为其他内容,因为它是一个您永远不应使用的保留键名.

看起来你可能像’string：name’那样运行生成器而不是正确的’name：string’:)

（编辑：李大同）

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