最近我从github克隆了一个rails项目。我已经有了一个数据库所以我认为没关系，但每当我在我的rails项目中运行rails服务器时，我都会收到此错误。
我注意到也没有Database.yml文件。
我的rails项目名称是anotiv
我的数据库名称是anotiv_development。
这是错误 -
All commands can be run with -h (or --help) for more information.
clearloadsave@clearloadsave:~/anotiv$ rails s
=> Booting Thin
=> Rails 4.2.3 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
Exiting
/home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/application/configuration.rb:110:in `database_configuration': Cannot load `Rails.application.database_configuration`: (RuntimeError)
Could not load database configuration. No such file - ["config/database.yml"]
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/activerecord-4.2.3/lib/active_record/railtie.rb:117:in `block (2 levels) in <class:Railtie>'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/activesupport-4.2.3/lib/active_support/lazy_load_hooks.rb:38:in `instance_eval'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/activesupport-4.2.3/lib/active_support/lazy_load_hooks.rb:38:in `execute_hook'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/activesupport-4.2.3/lib/active_support/lazy_load_hooks.rb:28:in `block in on_load'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/activesupport-4.2.3/lib/active_support/lazy_load_hooks.rb:27:in `each'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/activesupport-4.2.3/lib/active_support/lazy_load_hooks.rb:27:in `on_load'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/activerecord-4.2.3/lib/active_record/railtie.rb:116:in `block in <class:Railtie>'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/initializable.rb:30:in `instance_exec'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/initializable.rb:30:in `run'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/initializable.rb:55:in `block in run_initializers'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/2.0.0/tsort.rb:150:in `block in tsort_each'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/2.0.0/tsort.rb:183:in `block (2 levels) in each_strongly_connected_component'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/2.0.0/tsort.rb:219:in `each_strongly_connected_component_from'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/2.0.0/tsort.rb:182:in `block in each_strongly_connected_component'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/2.0.0/tsort.rb:180:in `each'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/2.0.0/tsort.rb:180:in `each_strongly_connected_component'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/2.0.0/tsort.rb:148:in `tsort_each'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/initializable.rb:54:in `run_initializers'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/application.rb:352:in `initialize!'
from /home/clearloadsave/anotiv/config/environment.rb:5:in `<top (required)>'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:in `require'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:in `block in require'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:240:in `load_dependency'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:in `require'
from /home/clearloadsave/anotiv/config.ru:3:in `block in <main>'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/rack-1.6.4/lib/rack/builder.rb:55:in `instance_eval'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/rack-1.6.4/lib/rack/builder.rb:55:in `initialize'
from /home/clearloadsave/anotiv/config.ru:in `new'
from /home/clearloadsave/anotiv/config.ru:in `<main>'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/rack-1.6.4/lib/rack/builder.rb:49:in `eval'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/rack-1.6.4/lib/rack/builder.rb:49:in `new_from_string'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/rack-1.6.4/lib/rack/builder.rb:40:in `parse_file'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/rack-1.6.4/lib/rack/server.rb:299:in `build_app_and_options_from_config'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/rack-1.6.4/lib/rack/server.rb:208:in `app'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/commands/server.rb:61:in `app'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/rack-1.6.4/lib/rack/server.rb:336:in `wrapped_app'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/commands/server.rb:139:in `log_to_stdout'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/commands/server.rb:78:in `start'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:80:in `block in server'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:75:in `tap'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:75:in `server'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /home/clearloadsave/.rbenv/versions/2.0.0-p643/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/commands.rb:17:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'
答案 0 :(得分：1)
在开源项目中，通常不包含database.yml文件b / c它具有用于访问数据库的密码（对于每个环境）。所以你应该创建一个。
例如，您可以创建一个新的rails项目，然后将database.yml文件（在项目的config目录中）复制到现有项目中。创建新项目时，可以指定应使用的数据库：
rails new my_project -d mysql
从文档中您可以指定的数据库是：
mysql，oracle，postgresql，sqlite3，frontbase，ibm_db，sqlserver，jdbcmysql，jdbcsqlite3，jdbcpostgresql，jdbc
答案 1 :(得分：0)
Could not load database configuration. No such file - ["config/database.yml"]
这是一个非常明确的错误消息，按照模式nunjucks创建文件。
答案 2 :(得分：0)
一旦你有了rails项目并且你也安装并运行了一个数据库系统（我推荐了令人惊奇的postgresql，但你觉得任何数据库都很好），只需让你的rails应用程序知道你要连接到它。您需要提供用户名和密码。
对于PostgreSQL：
在gemfile中：
gem 'pg'
然后安装gem：
bundle install
然后从你的rails app文件夹中执行：
touch config/database.yml
这是一个YAML文件，您可以将连接详细信息提供给。因此，打开文本编辑器并输入以下内容：
default: &default
adapter: postgresql
encoding: unicode
pool: 5
timeout: 5000
username: YOURUSERNAME
password: YOURPASSWORD
host: localhost
port: 5432
development:
<<: *default
database: YOURAPPNAME_development
test:
<<: *default
database: YOURAPPNAME_test
production:
<<: *default
database: YOURAPPNAME
最后，只需使用rake创建新的空数据库。
rake db:create
这可以让你启动你的服务器：
rails s