无法在 rails 上的 ruby 上创建模型

Question

我在 rails 开始学习 ruby。我遇到的问题是我不知道为什么我要创建模型时到达那里这是我试过的命令 rails生成模型书

并在我的 ubuntu 16 终端

中收到此错误

/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
/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

我收到这个错误：

/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)

//编辑

我检查了我的数据库，但也检查了 yamlint 网站在第 17 行也有错误，但没有错误

# 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

您正在 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 2

使用http://www.yamllint.com/

检查您的config/database.yml是否有效

Answer 3

主要问题是您的 database.yml 文件。您在文件中有一个 tab space 而 YAML 文件不允许这样做，因为它们被不同的编辑器和工具区别对待。缩进是正确解释 YAML 的最关键部分。所以在第 17 行修复它。并根据该永久解决方案保留文本编辑器的设置。我使用 Sublime ，其中在每个页面上我都有一个选项 Convert Indentation to Spaces 并且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

属于Rails 2版本。而是仅使用新命令：

rails generate model Book

Answer 4

检查您的应用程序数据库 file.It 在 /config/database 中。yml.If 您没有该文件，那么您可以从同一目录中的 dtabase.yaml.exemple 复制。

Answer 5

这是你的间距，看起来你的开发、测试和生产部分有 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 rails 上的 ruby 上创建模型

Can't create model on ruby on rails

ruby

ruby-on-rails

ruby-on-rails-3