ruby-on-rails – 在初始迁移期间,Rails在schema_migrations表中

>> rake db:drop; rake db:create:all; rake db:migrate
                                                                                           1 activity-image-additions-!?
==  CreateSomething: migrating ================================================
-- create_table(:somethings)
   -> 0.0042s
==  CreateSomething: migrated (0.0043s) =======================================

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

PG::UndefinedColumn: ERROR:  column "id" does not exist
LINE 1: ...O "schema_migrations" ("version") VALUES ($1) RETURNING "id"
                                                                   ^
: INSERT INTO "schema_migrations" ("version") VALUES ($1) RETURNING "id

生成的SQL查询不应包含RETURNING“id”,因为schema_migrations表没有id.

如果我在失败后尝试迁移数据库,它会成功：

>> rake db:migrate

==  CreateSomething: migrating ================================================
-- create_table(:somethings)
   -> 0.0041s
==  CreateSomething: migrated (0.0042s) =======================================

我目前在OS X 10.8上运行PostgreSQL 9.2.4,Rails 4.0.0,pg gem 0.16.0.

唯一的迁移：

class CreateSomething < ActiveRecord::Migration
  def change
    create_table :somethings do |t|
      t.integer :x
      t.integer :y
    end
  end
end

注意：我在其他Rails项目中尝试过这种迁移,但它确实有效.还有别的不对劲,但我不知道从哪里开始.

堆栈跟踪可用on pastebin.