ruby - 未定义的方法 auto_upgrade!将 Sinatra/DataMapper 应用程序推送到 Heroku 时

Question

有谁知道在 Heroku 的 Bamboo 堆栈上启动并运行使用 DataMapper 的 Sinatra 应用程序所需的魔法咒语？ Bamboo 堆栈不包含任何预安装的系统 gem，无论我尝试使用何种 gem 组合，我都会不断收到此错误:

undefined method `auto_upgrade!' for DataMapper:Module (NoMethodError)

这是我的 .gems 文件中的内容:

sinatra
pg
datamapper
do_postgres
dm-postgres-adapter

这些是我将应用程序推送到 Heroku 时安装的依赖项:

-----> Heroku receiving push
-----> Sinatra app detected

-----> Installing gem sinatra from http://rubygems.org
       Successfully installed sinatra-1.0
       1 gem installed

-----> Installing gem pg from http://rubygems.org
       Building native extensions.  This could take a while...
       Successfully installed pg-0.9.0
       1 gem installed

-----> Installing gem datamapper from http://rubygems.org
       Successfully installed extlib-0.9.15
       Successfully installed addressable-2.2.1
       Successfully installed dm-core-1.0.2
       Successfully installed dm-aggregates-1.0.2
       Successfully installed dm-migrations-1.0.2
       Successfully installed dm-constraints-1.0.2
       Successfully installed dm-transactions-1.0.2
       Successfully installed fastercsv-1.5.3
       Successfully installed json_pure-1.4.6
       Successfully installed dm-serializer-1.0.2
       Successfully installed dm-timestamps-1.0.2
       Successfully installed dm-validations-1.0.2
       Successfully installed uuidtools-2.1.1
       Successfully installed stringex-1.1.0
       Successfully installed dm-types-1.0.2
       Successfully installed datamapper-1.0.2
       16 gems installed

-----> Installing gem do_postgres from http://rubygems.org
       Building native extensions.  This could take a while...
       Successfully installed data_objects-0.10.2
       Successfully installed do_postgres-0.10.2
       2 gems installed

-----> Installing gem dm-postgres-adapter from http://rubygems.org
       Successfully installed dm-do-adapter-1.0.2
       Successfully installed dm-postgres-adapter-1.0.2
       2 gems installed

该应用程序使用 SQLite3 在本地运行良好。我是否缺少另一个 PostgreSQL 组件？

Answer 1

dm-migrations gem 添加了 DataMapper.auto_upgrade!。在自动升级之前，您是否需要 dm-migrations 或 datamapper gem？