Question

我开始在铁轨上学习红宝石。我有的问题是，我不知道为什么我到那里，而我想创建模型这是我试过的命令 rails生成模型书

并在我的ubuntu 16终端中出现此错误

/home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.0.1/lib/rails/app_loader.rb:40: warning: Insecure world writable dir /opt in PATH, mode 040777
/home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.0.1/lib/rails/application/configuration.rb:148:in `rescue in database_configuration': YAML syntax error occurred while parsing /home/android/ruby Tutorial/library/config/database.yml. Please note that YAML must be consistently indented using spaces. Tabs are not allowed. Error: (<unknown>): found a tab character that violate intendation while scanning a plain scalar at line 17 column 10 (RuntimeError)
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.0.1/lib/rails/application/configuration.rb:131:in `database_configuration'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.1/lib/active_record/railtie.rb:122:in `block (2 levels) in <class:Railtie>'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/lazy_load_hooks.rb:43:in `instance_eval'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/lazy_load_hooks.rb:43:in `execute_hook'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/lazy_load_hooks.rb:50:in `block in run_load_hooks'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/lazy_load_hooks.rb:49:in `each'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/lazy_load_hooks.rb:49:in `run_load_hooks'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.1/lib/active_record/base.rb:324:in `<module:ActiveRecord>'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activerecord-5.0.1/lib/active_record/base.rb:24:in `<top (required)>'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `require'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `block in require'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `require'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/spring-2.0.0/lib/spring/application.rb:345:in `active_record_configured?'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/spring-2.0.0/lib/spring/application.rb:263:in `disconnect_database'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/spring-2.0.0/lib/spring/application.rb:97:in `preload'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/spring-2.0.0/lib/spring/application.rb:143:in `serve'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/spring-2.0.0/lib/spring/application.rb:131:in `block in run'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/spring-2.0.0/lib/spring/application.rb:125:in `loop'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/spring-2.0.0/lib/spring/application.rb:125:in `run'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/spring-2.0.0/lib/spring/application/boot.rb:19:in `<top (required)>'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /home/android/.rbenv/versions/2.3.3/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from -e:1:in `<main>'

我也试过这个

rails script/generate model Book

我收到此错误：

/home/android/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0/gems/railties-5.0.1/lib/rails/app_loader.rb:40: warning: Insecure world writable dir /opt in PATH, mode 040777
rails aborted!
Don't know how to build task 'script/generate' (see --tasks)
/home/android/ruby Tutorial/library/bin/rails:9:in `require'
/home/android/ruby Tutorial/library/bin/rails:9:in `<top (required)>'
/home/android/ruby Tutorial/library/bin/spring:14:in `<top (required)>'
bin/rails:3:in `load'
bin/rails:3:in `<main>'
(See full trace by running task with --trace)

//修改

我检查了我的数据库但是也检查了yamlint网站在第17行也有错误但是没有错误

# SQLite version 3.x
#   gem install sqlite3
#
#   Ensure the SQLite 3 gem is defined in your Gemfile
#   gem 'sqlite3'
#
default: &default
  adapter: mysql
  pool: 5
  timeout: 5000

development:
   adapter: mysql
   database: library_development
   username: root
   password: root1234
   host: localhost

test:
   adapter: mysql
   database: library_test
   username: root
   password: root1234
   host: localhost

production:
   adapter: mysql
   database: library_production
   username: root
   password: root1234
   host: localhost

Answer 1

主要问题是您的database.yml文件。您在文件中有tab space，而YAML文件不允许这样，因为不同的编辑器和工具对它们的处理方式不同。缩进是正确解释YAML最关键的部分。所以在第17行解决了这个问题。对于永久性解决方案，请根据该设置保留文本编辑器的设置。我使用Sublime，在每个页面上我都可以选择Convert Indentation to Spaces，在其配置中我可以设置"translate_tabs_to_spaces": true。

关于您尝试的第二个命令：

rails script/generate model Book

它属于Rails 2版本。而是仅使用新命令：

rails generate model Book

Answer 2

您在Rails 5上使用Rails 2的命令。

要在Rails 5中生成模型，您应该使用：

rails generate model Book

Answer 3

使用http://www.yamllint.com/

检查config/database.yml是否有效

Answer 4

检入您的应用程序数据库文件。它位于/config/database.yml中。如果您没有该文件，则可以从同一目录中的dtabase.yaml.exemple进行复制。

Answer 5

这是你的间距，你的开发，测试和生产部分看起来你有3个空格而不是2个。

2个空格：

default: &default
  adapter: mysql
  pool: 5
  timeout: 5000

3个空格：

development:
   adapter: mysql

无法在轨道上的ruby上创建模型

5 个答案: