从 sqlite 到 postgres rails4，ruby 1.9.3 的 Taps 迁移失败

【问题标题】：taps migration failing from sqlite to postgres rails4, ruby 1.9.3从 sqlite 到 postgres rails4，ruby 1.9.3 的 Taps 迁移失败
【发布时间】：2013-08-15 14:07:06
【问题描述】：

我正在尝试将我的 Rails 应用程序迁移到 Heroku 的 Postgresql，但是我无法从我的 SQLite3 数据库中获取数据，这是我尝试过的：

为新数据库创建 Postgres 数据库用户

$ createuser f3
Shall the new role be a superuser? (y/n) n
Shall the new role be allowed to create databases? (y/n) y
Shall the new role be allowed to create more new roles? (y/n) y

编辑 - 下面更新了命令 - 改为使用此命令

$ createuser f3 -d -s

创建所需的数据库

$ createdb -Of3 -Eutf8 f3_development
$ createdb -Of3 -Eutf8 f3_test

更新 Gemfile

gem 'sqlite3'
gem 'pg'
gem 'taps'
$ bundle

更新 database.yml

#development:
#  adapter: sqlite3
#  database: db/development.sqlite3
#  pool: 5
#  timeout: 5000

development:
  adapter: postgresql
  encoding: unicode
  database: f3_development
  pool: 5
  username: f3
  password:

#test:
#  adapter: sqlite3
#  database: db/test.sqlite3
#  pool: 5
#  timeout: 5000

test:
  adapter: postgresql
  encoding: unicode
  database: f3_test
  pool: 5
  username: f3
  password:

在 sqlite 数据库上启动 taps 服务器

$ taps server sqlite://db/development.sqlite3 user password

迁移数据

$ taps pull postgres://f3@localhost/f3_development http://user:password@localhost:5000

这会产生一个错误：

MacBook-Pro:devise_example-master david$ taps pull postgres://david:abc123@localhost/f3_development http://user:password@localhost:5000
Receiving schema
Unable to fetch tables information from http://user:password@localhost:5000. Please check the server log.

任何人都解决了这个问题，（我不能只使用 rvm 切换到 Ruby 1.9.2，因为我的应用程序使用了很多不适用于旧 ruby​​ 的 gem）。

以下是发出 pull 时来自 taps sqlite 服务器的日志 

MacBook-Pro:devise_example-master david$ taps server sqlite://db/development.sqlite3 user password
== Sinatra/1.0 has taken the stage on 5000 for production with backup from WEBrick
[2013-08-13 21:38:23] INFO  WEBrick 1.3.1
[2013-08-13 21:38:23] INFO  ruby 1.9.3 (2013-06-27) [x86_64-darwin12.4.0]
[2013-08-13 21:38:23] INFO  WEBrick::HTTPServer#start: pid=4357 port=5000
127.0.0.1 - user [13/Aug/2013 21:38:32] "GET / HTTP/1.1" 200 - 0.0011
localhost - - [13/Aug/2013:21:38:32 CEST] "GET / HTTP/1.1" 200 31
- -> /
127.0.0.1 - user [13/Aug/2013 21:38:32] "POST /sessions HTTP/1.1" 200 - 0.0070
localhost - - [13/Aug/2013:21:38:32 CEST] "POST /sessions HTTP/1.1" 200 46
- -> /sessions
Rack::Utils::OkJson::Error - cannot encode Symbol: :schema_migrations:
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:427:in `valenc'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:438:in `block in arrenc'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:438:in `map'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:438:in `arrenc'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:410:in `encode'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/taps-0.3.24/lib/taps/server.rb:157:in `block in <class:Server>'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:865:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:865:in `block in route'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:521:in `instance_eval'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:521:in `route_eval'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:500:in `block (2 levels) in route!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:497:in `catch'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:497:in `block in route!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:476:in `each'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:476:in `route!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:601:in `dispatch!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:411:in `block in call!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `instance_eval'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `block in invoke'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `catch'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `invoke'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:411:in `call!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:399:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/deflater.rb:25:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/auth/basic.rb:25:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/commonlogger.rb:33:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `block in call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:1005:in `synchronize'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/handler/webrick.rb:60:in `service'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'
ERROR: Rack::Utils::OkJson::Error: cannot encode Symbol: :schema_migrations
An error occurred but Hoptoad was not notified. To use Hoptoad, please
install the 'hoptoad_notifier' gem and set ENV["HOPTOAD_API_KEY"]
127.0.0.1 - user [13/Aug/2013 21:38:32] "GET /sessions/6475330165/pull/table_names HTTP/1.1" 500 - 0.0112
localhost - - [13/Aug/2013:21:38:32 CEST] "GET /sessions/6475330165/pull/table_names HTTP/1.1" 500 522
- -> /sessions/6475330165/pull/table_names
Rack::Utils::OkJson::Error - cannot encode Symbol: :schema_migrations:
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:427:in `valenc'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:438:in `block in arrenc'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:438:in `map'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:438:in `arrenc'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:410:in `encode'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/taps-0.3.24/lib/taps/server.rb:157:in `block in <class:Server>'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:865:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:865:in `block in route'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:521:in `instance_eval'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:521:in `route_eval'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:500:in `block (2 levels) in route!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:497:in `catch'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:497:in `block in route!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:476:in `each'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:476:in `route!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:601:in `dispatch!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:411:in `block in call!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `instance_eval'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `block in invoke'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `catch'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `invoke'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:411:in `call!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:399:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/deflater.rb:25:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/auth/basic.rb:25:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/commonlogger.rb:33:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `block in call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:1005:in `synchronize'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/handler/webrick.rb:60:in `service'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'
ERROR: Rack::Utils::OkJson::Error: cannot encode Symbol: :schema_migrations
An error occurred but Hoptoad was not notified. To use Hoptoad, please
install the 'hoptoad_notifier' gem and set ENV["HOPTOAD_API_KEY"]
127.0.0.1 - user [13/Aug/2013 21:38:32] "GET /sessions/6475330165/pull/table_names HTTP/1.1" 500 - 0.0048
localhost - - [13/Aug/2013:21:38:32 CEST] "GET /sessions/6475330165/pull/table_names HTTP/1.1" 500 522
- -> /sessions/6475330165/pull/table_names
Rack::Utils::OkJson::Error - cannot encode Symbol: :schema_migrations:
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:427:in `valenc'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:438:in `block in arrenc'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:438:in `map'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:438:in `arrenc'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:410:in `encode'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/taps-0.3.24/lib/taps/server.rb:157:in `block in <class:Server>'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:865:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:865:in `block in route'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:521:in `instance_eval'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:521:in `route_eval'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:500:in `block (2 levels) in route!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:497:in `catch'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:497:in `block in route!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:476:in `each'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:476:in `route!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:601:in `dispatch!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:411:in `block in call!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `instance_eval'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `block in invoke'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `catch'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `invoke'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:411:in `call!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:399:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/deflater.rb:25:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/auth/basic.rb:25:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/commonlogger.rb:33:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `block in call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:1005:in `synchronize'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/handler/webrick.rb:60:in `service'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'
ERROR: Rack::Utils::OkJson::Error: cannot encode Symbol: :schema_migrations
An error occurred but Hoptoad was not notified. To use Hoptoad, please
install the 'hoptoad_notifier' gem and set ENV["HOPTOAD_API_KEY"]
127.0.0.1 - user [13/Aug/2013 21:38:32] "GET /sessions/6475330165/pull/table_names HTTP/1.1" 500 - 0.0043
localhost - - [13/Aug/2013:21:38:32 CEST] "GET /sessions/6475330165/pull/table_names HTTP/1.1" 500 522
- -> /sessions/6475330165/pull/table_names
Rack::Utils::OkJson::Error - cannot encode Symbol: :schema_migrations:
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:427:in `valenc'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:438:in `block in arrenc'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:438:in `map'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:438:in `arrenc'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:410:in `encode'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/taps-0.3.24/lib/taps/server.rb:157:in `block in <class:Server>'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:865:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:865:in `block in route'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:521:in `instance_eval'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:521:in `route_eval'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:500:in `block (2 levels) in route!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:497:in `catch'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:497:in `block in route!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:476:in `each'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:476:in `route!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:601:in `dispatch!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:411:in `block in call!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `instance_eval'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `block in invoke'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `catch'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `invoke'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:411:in `call!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:399:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/deflater.rb:25:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/auth/basic.rb:25:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/commonlogger.rb:33:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `block in call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:1005:in `synchronize'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/handler/webrick.rb:60:in `service'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'
ERROR: Rack::Utils::OkJson::Error: cannot encode Symbol: :schema_migrations
An error occurred but Hoptoad was not notified. To use Hoptoad, please
install the 'hoptoad_notifier' gem and set ENV["HOPTOAD_API_KEY"]
127.0.0.1 - user [13/Aug/2013 21:38:32] "GET /sessions/6475330165/pull/table_names HTTP/1.1" 500 - 0.0046
localhost - - [13/Aug/2013:21:38:32 CEST] "GET /sessions/6475330165/pull/table_names HTTP/1.1" 500 522
- -> /sessions/6475330165/pull/table_names
Rack::Utils::OkJson::Error - cannot encode Symbol: :schema_migrations:
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:427:in

........

lib/ruby/1.9.1/webrick/httpserver.rb:138:in service' /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/httpserver.rb:94:inrun' /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/server.rb:191:in block in start_thread' ERROR: Rack::Utils::OkJson::Error: cannot encode Symbol: :schema_migrations An error occurred but Hoptoad was not notified. To use Hoptoad, please install the 'hoptoad_notifier' gem and set ENV["HOPTOAD_API_KEY"] 127.0.0.1 - user [13/Aug/2013 21:38:32] "GET /sessions/6475330165/pull/table_names HTTP/1.1" 500 - 0.0045 localhost - - [13/Aug/2013:21:38:32 CEST] "GET /sessions/6475330165/pull/table_names HTTP/1.1" 500 522 - -> /sessions/6475330165/pull/table_names Rack::Utils::OkJson::Error - cannot encode Symbol: :schema_migrations: /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:427:invalenc' /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:438:in block in arrenc' /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:438:inmap' /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:438:in arrenc' /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:410:inencode' /usr/local/rvm/gems/ruby-1.9.3-p448/gems/taps-0.3.24/lib/taps/server.rb:157:in block in <class:Server>' /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:865:incall' /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:865:in block in route' /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:521:ininstance_eval'

......

ERROR: Rack::Utils::OkJson::Error: cannot encode Symbol: :schema_migrations
An error occurred but Hoptoad was not notified. To use Hoptoad, please
install the 'hoptoad_notifier' gem and set ENV["HOPTOAD_API_KEY"]
127.0.0.1 - user [13/Aug/2013 21:38:32] "GET /sessions/6475330165/pull/table_names HTTP/1.1" 500 - 0.0050
localhost - - [13/Aug/2013:21:38:32 CEST] "GET /sessions/6475330165/pull/table_names HTTP/1.1" 500 522
- -> /sessions/6475330165/pull/table_names
Rack::Utils::OkJson::Error - cannot encode Symbol: :schema_migrations:
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:427:in `valenc'

......

 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'
ERROR: Rack::Utils::OkJson::Error: cannot encode Symbol: :schema_migrations
An error occurred but Hoptoad was not notified. To use Hoptoad, please
install the 'hoptoad_notifier' gem and set ENV["HOPTOAD_API_KEY"]
127.0.0.1 - user [13/Aug/2013 21:38:32] "GET /sessions/6475330165/pull/table_names HTTP/1.1" 500 - 0.0045
localhost - - [13/Aug/2013:21:38:32 CEST] "GET /sessions/6475330165/pull/table_names HTTP/1.1" 500 522
- -> /sessions/6475330165/pull/table_names
Rack::Utils::OkJson::Error - cannot encode Symbol: :schema_migrations:
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:427:in `valenc'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:438:in `block in arrenc'

......

 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/commonlogger.rb:33:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `block in call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:1005:in `synchronize'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/handler/webrick.rb:60:in `service'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'
ERROR: Rack::Utils::OkJson::Error: cannot encode Symbol: :schema_migrations
An error occurred but Hoptoad was not notified. To use Hoptoad, please
install the 'hoptoad_notifier' gem and set ENV["HOPTOAD_API_KEY"]
127.0.0.1 - user [13/Aug/2013 21:38:32] "GET /sessions/6475330165/pull/table_names HTTP/1.1" 500 - 0.0159
localhost - - [13/Aug/2013:21:38:32 CEST] "GET /sessions/6475330165/pull/table_names HTTP/1.1" 500 522
- -> /sessions/6475330165/pull/table_names
Rack::Utils::OkJson::Error - cannot encode Symbol: :schema_migrations:
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:427:in `valenc'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:438:in

.......

 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:411:in `call!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:399:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/deflater.rb:25:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/auth/basic.rb:25:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/commonlogger.rb:33:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `block in call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:1005:in `synchronize'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/handler/webrick.rb:60:in `service'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'
ERROR: Rack::Utils::OkJson::Error: cannot encode Symbol: :schema_migrations
An error occurred but Hoptoad was not notified. To use Hoptoad, please
install the 'hoptoad_notifier' gem and set ENV["HOPTOAD_API_KEY"]
127.0.0.1 - user [13/Aug/2013 21:38:32] "GET /sessions/6475330165/pull/table_names HTTP/1.1" 500 - 0.0048
localhost - - [13/Aug/2013:21:38:32 CEST] "GET /sessions/6475330165/pull/table_names HTTP/1.1" 500 522
- -> /sessions/6475330165/pull/table_names
Rack::Utils::OkJson::Error - cannot encode Symbol: :schema_migrations:
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:427:in `valenc'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:438:in `block in arrenc'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:438:in `map'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:438:in `arrenc'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/utils/okjson.rb:410:in `encode'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/taps-0.3.24/lib/taps/server.rb:157:in `block in <class:Server>'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:865:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:865:in `block in route'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:521:in `instance_eval'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:521:in `route_eval'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:500:in `block (2 levels) in route!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:497:in `catch'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:497:in `block in route!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:476:in `each'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:476:in `route!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:601:in `dispatch!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:411:in `block in call!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `instance_eval'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `block in invoke'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `catch'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `invoke'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:411:in `call!'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:399:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/deflater.rb:25:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/auth/basic.rb:25:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/commonlogger.rb:33:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `block in call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:1005:in `synchronize'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `call'
 /usr/local/rvm/gems/ruby-1.9.3-p448/gems/rack-1.5.2/lib/rack/handler/webrick.rb:60:in `service'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
 /usr/local/rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'
ERROR: Rack::Utils::OkJson::Error: cannot encode Symbol: :schema_migrations
An error occurred but Hoptoad was not notified. To use Hoptoad, please
install the 'hoptoad_notifier' gem and set ENV["HOPTOAD_API_KEY"]
127.0.0.1 - user [13/Aug/2013 21:38:32] "GET /sessions/6475330165/pull/table_names HTTP/1.1" 500 - 0.0045
localhost - - [13/Aug/2013:21:38:32 CEST] "GET /sessions/6475330165/pull/table_names HTTP/1.1" 500 522
- -> /sessions/6475330165/pull/table_names

【问题讨论】：

    标签： ruby sqlite postgresql ruby-on-rails-4 taps


    【解决方案1】：

    这对我有用：

    1. 我从我的项目目录中上一个目录，然后执行以下操作
    2. gem install taps
    3. gem uninstall rack
    4. gem install rack --version 1.0.1

    从项目目录启动 sqlite 服务器，在 'one up directory' 运行：

    taps pull postgres://f3@localhost/f3_development http://user:password@localhost:5000

    然后像以前一样进行迁移，并且成功了。我安装了机架 1.5.2，因此我必须将其移除并更换为机架 1.0.1。我正在使用 ruby​​ 2.0.0-p0 和 rails 4.0.0.beta1

    似乎只有 pull 命令需要旧版本的 rack 以便服务器可以在较新的 1.5.2 版本上运行...

    【讨论】：

    • 除了 1.0.1 之外，我还安装了 2 个不同版本的机架。我不得不删除它们。
    • 我还必须卸载我的 rack-1.6.4 版本，然后运行 ​​taps pull 命令，然后重新安装 rack-1.6.4。
    【解决方案2】：

    @David Karlsson 的回答也对我有用。除非我必须在水龙头完成拉动后更新后架

    gem update rack

    并运行bundle install 以恢复我所有的宝石工作。

    我在 rails 3.2 和 ruby​​ 1.9.3

    【讨论】：

      【解决方案3】：

      谢谢@DavidKarlsson，只是添加到您的答案中，无需卸载现有机架。按照@hak8or 在https://github.com/ricardochimal/taps/issues/128 中的建议，我使用了一个Gemfile 来确保使用机架版本1.0.1。但是安装后我有各种版本的机架

      $ gem uninstall 'rack'

Select gem to uninstall:
1. rack-1.0.1
2. rack-1.4.4
3. rack-1.4.5
4. rack-1.5.2
5. All versions

      并且不想卸载它们，因为这可能会影响我在同一台机器上的其他项目。当我运行水龙头时，它会使用最新的 rack-1.5.2，所以我所做的是使用 bundle exec 运行水龙头，在我的例子中

      bundle exec taps server sqlite://db/development.sqlite3 root root

      希望对你有帮助！

      【讨论】：

        猜你喜欢
        • 2013-07-04
        • 2015-08-20
        • 2019-05-31
        • 2021-01-11
        • 2023-03-14
        • 1970-01-01
        • 2021-01-23
        • 1970-01-01
        • 1970-01-01
        相关资源
        最近更新 更多
        热门标签
        Java Python linux javascript Mysql C# Docker 算法 前端 SpringBoot Redis Vue spring 设计模式 .net core .net kubernetes c++ 数据库 数据结构 大数据 js 机器学习 微服务 Android Go 程序员 面试 JVM ASP.net core 云原生 人工智能 后端 PHP git CSS golang k8s Nginx Django mybatis 深度学习 多线程 React 架构 devops 爬虫 云计算 Spring Boot LeetCode