Question

每次我尝试在Heroku上学习时，我的应用程序都会崩溃（学校项目需要）。它在当地完美运作。

An error occurred in the application and your page could not be served. Please try again in a few moments.

If you are the application owner, check your logs for details.

以下是日志的说法：

2015-05-23T23:52:47.952635+00:00 heroku[web.1]: State changed from crashed to starting
2015-05-23T23:52:50.499347+00:00 heroku[web.1]: Starting process with command `bundle exec thin start -R config.ru -e $RACK_ENV -p 10414`
2015-05-23T23:52:52.736994+00:00 app[web.1]: /app/vendor/bundle/ruby/2.0.0/gems/dm-core-1.2.1/lib/dm-core/adapters.rb:163:in `require': cannot load such file -- dm-sqlite-adapter (LoadError)
...
2015-05-23T23:53:11.790209+00:00 heroku[run.9012]: Awaiting client
2015-05-23T23:53:11.844408+00:00 heroku[run.9012]: Starting process with command `bundle exec irb`
2015-05-23T23:53:12.025719+00:00 heroku[run.9012]: State changed from starting to up
2015-05-23T23:54:03.317467+00:00 heroku[run.9012]: Process exited with status 0
2015-05-23T23:54:03.336441+00:00 heroku[run.9012]: State changed from up to complete
2015-05-23T23:54:08.767294+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=mysterious-woodland-2551.herokuapp.com request_id=a53bb16e-88e6-4701-857f-bd3319ce8d91 fwd="129.210.115.16" dyno= connect= service= status=503 bytes=
2015-05-23T23:54:09.427490+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=mysterious-woodland-2551.herokuapp.com request_id=8effbba8-b14f-4b8a-bb2f-a7a4eae5e44c fwd="129.210.115.16" dyno= connect= service= status=503 bytes=

My Gemfile看起来像这样

    # A sample Gemfile
    source "https://rubygems.org"
    ruby '2.0.0'

    gem 'sinatra'
    gem 'slim'
    gem 'sass'
    gem 'dm-core'
    gem 'dm-migrations'
    gem 'thin'
    group :development, :test do
      gem 'sqlite3'
    end

    group :production do
      gem 'pg'
    end

main.rb的

#!/user/bin/env ruby

require 'sinatra'
require 'slim'
require 'sass'
require './student'

configure do
  enable :sessions
  set :username, 'kenneth'
  set :password, 'bigler'
end

get('/styles.css'){ scss :styles }

get '/' do
  slim :home
end
...

student.rb

require 'dm-core'
require 'dm-migrations'

# DataMapper.setup(:default, "sqlite3://#{Dir.pwd}/development.db")
DataMapper::setup(:default, ENV['DATABASE_URL'] || "sqlite3://#{Dir.pwd}/development.db")

class Student
  include DataMapper::Resource
  property :id, Serial
  property :first_name, Text
  property :last_name, Text
  property :year, Integer
end

configure do
  enable :sessions
  set :username, 'kenneth'
  set :password, 'bigler'
end

DataMapper.finalize

get '/students' do
...

当我输入heroku运行控制台

时

要求＆＃39; ./ main＆＃39;

我明白了：

LoadError: cannot load such file -- dm-sqlite-adapter
    from /app/vendor/bundle/ruby/2.0.0/gems/dm-core-1.2.1/lib/dm-core/adapters.rb:163:in `require'
    from /app/vendor/bundle/ruby/2.0.0/gems/dm-core-1.2.1/lib/dm-core/adapters.rb:163:in `load_adapter'
    from /app/vendor/bundle/ruby/2.0.0/gems/dm-core-1.2.1/lib/dm-core/adapters.rb:133:in `adapter_class'
    from /app/vendor/bundle/ruby/2.0.0/gems/dm-core-1.2.1/lib/dm-core/adapters.rb:13:in `new'
    from /app/vendor/bundle/ruby/2.0.0/gems/dm-core-1.2.1/lib/dm-core.rb:230:in `setup'
    from /app/student.rb:5:in `<top (required)>'
    from /app/main.rb:6:in `require'
    from /app/main.rb:6:in `<top (required)>'
    from (irb):1:in `require'
    from (irb):1
    from /app/bin/irb:16:in `<main>'

关于我能做什么的任何建议？

Answer 1

你收到此错误是因为heroku没有使用postgresql的Sqlite适配器。因此，您需要跳过在Heroku上使用Sqlite适配器。

如果您使用的是DataMapper，请使用下面的内容 -

DataMapper :: setup（：default，ENV [＆＃39; DATABASE_URL＆＃39;] ||＆＃34; sqlite3：您的数据库文件名＆＃34;）

检查您是否遵循以下步骤。也许你可以从下面做几步，所以忽略这些并继续其余的步骤。

<强> 1。在Heroku网站注册：

https://id.heroku.com/login（指向外部网站的链接。）

下载工具栏
获取捆绑宝石：

gem install bundler
创建＆＃34; Gemfile＆＃34;在应用程序目录：
它将创建＆＃34; Gemfile.lock＆＃34;文件在您的应用程序目录中。

捆绑安装 - 无需生产

创建＆＃34; config.ru＆＃34;机架式程序的文件包含

要求＆＃39; ./ main＆＃39;

运行Sinatra :: Application

初始化git存储库，在您的应用程序文件夹中运行：

git init

设置git identity：

git config user.name＆＃34; your-name＆＃34;

git config user.email＆＃34; yourname@email.com"

将应用程序添加到git存储库并提交，在您的应用程序文件夹中运行：

git add。

git commit -m＆＃34;我的第一个版本＆＃34;

在Heroku上创建应用

heroku创建myapplication1

将应用程序从git存储库推送到Heroku服务器

git push heroku master

<强> 12。在Heroku服务器上创建数据库

heroku运行控制台

IRB＆GT;要求＆＃39; ./ main＆＃39;

IRB＆GT; DataMapper.auto_migrate！

连接到新网站

heroku open

sqlite3和heroku的问题

1 个答案: