我正在尝试向Heroku部署全新的Publify博客。在我的本地计算机上一切正常。
并且git push heroku master没有说出任何问题：
Counting objects: 7, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (4/4), done.
Writing objects: 100% (6/6), 786 bytes, done.
Total 6 (delta 1), reused 0 (delta 0)
-----> Heroku receiving push
-----> Ruby/Rails app detected
-----> Installing dependencies using Bundler version 1.2.2
Running: bundle install --without development:test --path
vendor/bundle --binstubs bin/ --deployment
Using rake (10.0.2)
... (edited out list of gems being used)
Your bundle is complete! It was installed into ./vendor/bundle
Cleaning up the bundler cache.
-----> Writing config/database.yml to read from DATABASE_URL
-----> Rails plugin injection
Injecting rails_log_stdout
Injecting rails3_serve_static_assets
-----> Discovering process types
Procfile declares types -> (none)
Default types for Ruby/Rails -> console, rake, web, worker
-----> Compiled slug size: 10.7MB
-----> Launching... done, v7
http://desolate-harbor-2909.herokuapp.com deployed to Heroku
To git@heroku.com:desolate-harbor-2909.git
cea2c5c..efb4eb2 master -> master
但之后我在应用页面上看到了这个：
应用程序错误
应用程序中发生错误，无法提供您的页面。请稍后再试。如果您是应用程序所有者，请查看日志以获取详细信息。
和Heroku日志显示：
heroku[slugc]: Slug compilation started
heroku[api]: Release v7 created by runsfor@gmail.com
heroku[api]: Deploy efb4eb2 by runsfor@gmail.com
heroku[web.1]: State changed from crashed to starting
heroku[slugc]: Slug compilation finished
heroku[web.1]: Starting process with command `bundle exec rails server -p 50812`
app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler/dsl.rb:7:in `evaluate'
app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/bin/bundle:14:in `<top (required)>'
app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler/dsl.rb:32:in `instance_eval'
app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler/friendly_errors.rb:4:in `with_friendly_errors'
app[web.1]: There was an error in your Gemfile, and Bundler cannot continue.
app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler/cli.rb:423:in `exec'
app[web.1]: /app/Gemfile:7:in `eval_gemfile'
app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler/dsl.rb:32:in `eval_gemfile'
app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler/definition.rb:18:in `build'
app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler.rb:144:in `definition'
app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler/vendor/thor/task.rb:27:in `run'
app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler/vendor/thor/invocation.rb:120:in `invoke_task'
app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler/vendor/thor.rb:275:in `dispatch'
app[web.1]: /usr/local/lib/ruby/1.9.1/syck.rb:135:in `load'
app[web.1]: /app/vendor/bundle/ruby/1.9.1/bin/bundle:23:in `load'
app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler/vendor/thor/base.rb:408:in `start'
app[web.1]: /app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/bin/bundle:14:in `block in <top (required)>'
app[web.1]: /usr/local/lib/ruby/1.9.1/syck.rb:135:in `load': syntax error on line 27, col 0: `adapter = uri.scheme' (ArgumentError)
app[web.1]: /app/vendor/bundle/ruby/1.9.1/bin/bundle:23:in `<main>'
heroku[web.1]: Process exited with status 4
heroku[web.1]: State changed from starting to crashed
heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/ host=desolate-harbor-2909.herokuapp.com fwd=171.5.16.142 dyno= queue= wait= connect= service= status=503 bytes=
heroku[router]: at=error code=H10 desc="App crashed" method=GET path=/favicon.ico host=desolate-harbor-[2909.herokuapp.com][1] fwd=171.5.16.142 dyno= queue= wait= connect= service= status=503 bytes=
我做错了什么？我想我需要在部署到Heroku之前以某种方式设置它。
Database.yml文件是：
login: &login
adapter: postgresql
host: localhost
username: *****
password: *****
development:
database: typo_dev
<<: *login
test:
database: typo_tests
<<: *login
production:
database: typo
<<: *login
Heroku运行rake db：migrate输出为：
Running `rake db:migrate` attached to terminal... up, run.7604
/usr/local/lib/ruby/1.9.1/syck.rb:135:in `load': syntax error on line 27, col 0: `adapter = uri.scheme' (ArgumentError)
/usr/local/lib/ruby/1.9.1/syck.rb:135:in `load'
/app/Gemfile:7:in `eval_gemfile'
/app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler/dsl.rb:32:in `instance_eval'
/app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler/dsl.rb:32:in `eval_gemfile'
/app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler/dsl.rb:7:in `evaluate'
/app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler/definition.rb:18:in `build'
/app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler.rb:144:in `definition'
/app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler/cli.rb:423:in `exec'
/app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler/vendor/thor/task.rb:27:in `run'
/app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler/vendor/thor/invocation.rb:120:in `invoke_task'
/app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler/vendor/thor.rb:275:in `dispatch'
/app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler/vendor/thor/base.rb:408:in `start'
/app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/bin/bundle:14:in `block in <top (required)>'
/app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/lib/bundler/friendly_errors.rb:4:in `with_friendly_errors'
/app/vendor/bundle/ruby/1.9.1/gems/bundler-1.2.2/bin/bundle:14:in `<top (required)>'
/app/vendor/bundle/ruby/1.9.1/bin/bundle:23:in `load'
/app/vendor/bundle/ruby/1.9.1/bin/bundle:23:in `<main>'
There was an error in your Gemfile, and Bundler cannot continue.
答案 0 :(得分：2)
当Rails加载database.yml文件时，实际上filters it through ERB before loading it as a Yaml file。这样您就可以使用Ruby动态创建配置，例如将密码保存在存储库之外。
当您将Rails应用程序推送到Heroku时，a new database.yml file is created, replacing the original。这个新的database.yml使用ERB从DATABASE_URL环境变量构造配置，所以实际上它不是一个“纯”的Yaml文件 - 你可以认为它类似于database.yml.erb。
错误的Gemfile loads the database.yml file然后是parses it as Yaml，但不会先通过ERB提供它。您看到的错误是由Yaml解析器读取文件引起的，但由于它是ERB而失败，因为它不是有效的Yaml。
要解决此问题，您需要确保在被读取为Yaml之前将database.yml文件通过ERB。在Gemfile更改行
conf = YAML.load(File.read(dbfile))
到
require 'erb'
conf = YAML.load(ERB.new(File.read(dbfile)).result)
您可能想要打开Typo的错误报告，甚至发送拉取请求。