Question

所以我在db-＆gt; migrate文件夹中创建了一个手动文件名001_create_users.rb，如下所示：

class CreateUsers < ActiveRecord::Base
  def self.up
    create_table :users do |t|
      t.string :name
      t.string :email
      t.string :password
      t.string :bio

      t.timestamps
    end
  end

  def self.down
    drop_table :users
  end
end

然后我运行：bundle exec rake db:migrate命令，我收到此错误：

耙子流产了！发生了错误，此错误以及稍后的所有迁移取消：

无法找到表'create_users'

错误更详细，所以我只是从终端窗口复制粘贴，但第一部分是我得到的错误的头部

  耙子流产了！发生了错误，此错误以及稍后的所有迁移   取消：

无法找到表'create_users'   /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/connection_adapters/sqlite_adapter.rb:472:in table_structure' /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/connection_adapters/sqlite_adapter.rb:346:in列'   /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/connection_adapters/schema_cache.rb:12:in   block in initialize' /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/model_schema.rb:228:in收率”   /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/model_schema.rb:228:in   default' /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/model_schema.rb:228:in列   /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/model_schema.rb:243:in   column_defaults' /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/base.rb:482:in初始化”   /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/migration.rb:538:in   new' /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/migration.rb:538:in load_migration”   /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/migration.rb:533:in   migration' /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/migration.rb:528:in迁移”   /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/migration.rb:720:in   block (2 levels) in migrate' /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/migration.rb:775:in称之为”   /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/migration.rb:775:in   block in ddl_transaction' /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/connection_adapters/abstract/database_statements.rb:192:in交易”   /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/transactions.rb:208:in   transaction' /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/migration.rb:775:in ddl_transaction”   /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/migration.rb:719:in   block in migrate' /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/migration.rb:700:in每个”   /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/migration.rb:700:in   migrate' /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/migration.rb:570:in向上”   /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/gems/activerecord-3.2.11/lib/active_record/migration.rb:551:in   'migrate' /Users/JonyIve/Documents/HisFirstService/Rakefile:19:in阻止（2级）'   /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/bin/ruby_noexec_wrapper:14:in   eval' /Users/JonyIve/.rvm/gems/ruby-1.9.3-p362@railsbabak/bin/ruby_noexec_wrapper:14:in'任务：TOP =＆gt; db：migrate（通过运行任务查看完整跟踪   --trace）

此外，如果我说“哪个宝石”就是我得到的：

which gem
/Users/JonyIve/.rvm/rubies/ruby-1.9.3-p362/bin/gem

Answer 1

您应该ActiveRecord::Base继承ActiveRecord::Migration。

class CreateProjects < ActiveRecord::Migration
  def change
    create_table :projects do |t|
      t.text :title
      t.text :description
      t.text :slug

      t.timestamps
    end
  end
end

耙迁移无法找到表

1 个答案: