如何解决ROR-4中的NoMethod错误
请帮我解决以下错误。 当我输入rake db：在ruby cmd中创建时，我遇到了这种类型的错误。
错误：
rake aborted! NoMethodError: undefined method `each' for # Tasks: TOP => db:create => db:load_config (See full trace by running task with --trace) 我的database.yml和gem文件如下。
配置/ database.yml的
# MySQL. Versions 5.0+ are recommended. # # Install the MYSQL driver # gem install mysql2 # # Ensure the MySQL gem is defined in your Gemfile # gem 'mysql2' # # And be sure to use new-style password hashing: # http://dev.mysql.com/doc/refman/5.0/en/old-client.html # default:&default adapter:mysql2 encoding:utf8 pool:5 username:root password:pass host:localhost development:<<:*default database:mysqlapp_development # Warning: The database defined as "test" will be erased and # re-generated from your development database when you run "rake". # Do not set this db to the same as development or production. test:<<:*default database:mysqlapp_test # As with config/secrets.yml, you never want to store sensitive information, # like your database password, in your source code. If your source code is # ever seen by anyone, they now have access to your database. # # Instead, provide the password as a unix environment variable when you boot # the app. Read http://guides.rubyonrails.org/configuring.html#configuring-a-database # for a full rundown on how to provide these environment variables in a # production deployment. # # On Heroku and other platform providers, you may have a full connection URL # available as an environment variable. For example: # # DATABASE_URL="mysql2://myuser:mypass@localhost/somedatabase" # # You can use this database configuration with: # # production: # url: # production:<<:*default database:mysqlapp_production username:mysqlapp password:
的Gemfile
source 'https://rubygems.org' # Bundle edge Rails instead: gem 'rails', github: 'rails/rails' gem 'rails', '4.2.0' # Use mysql as the database for Active Record gem 'mysql2' # Use SCSS for stylesheets gem 'sass-rails', '~> 5.0' # Use Uglifier as compressor for JavaScript assets gem 'uglifier', '>= 1.3.0' # Use CoffeeScript for .coffee assets and views gem 'coffee-rails', '~> 4.1.0' # See https://github.com/sstephenson/execjs#readme for more supported runtimes # gem 'therubyracer', platforms: :ruby # Use jquery as the JavaScript library gem 'jquery-rails' # Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks gem 'turbolinks' # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder gem 'jbuilder', '~> 2.0' # bundle exec rake doc:rails generates the API under doc/api. gem 'sdoc', '~> 0.4.0', group: :doc # Use ActiveModel has_secure_password # gem 'bcrypt', '~> 3.1.7' # Use Unicorn as the app server # gem 'unicorn' # Use Capistrano for deployment # gem 'capistrano-rails', group: :development group :development, :test do # Call 'debugger' anywhere in the code to stop execution and get a debugger console gem 'debugger' # Access an IRB console on exception pages or by using in views gem 'web-console', '~> 2.0' end # Windows does not include zoneinfo files, so bundle the tzinfo-data gem gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
由于我是ROR的新手，请帮助解决此错误并成功运行命令。我使用的是ruby version-1.9.3和Rails版本4.0.2。
对我来说，这是database.yml中一个错误的未注释的注释行。 对你来说，你的database.yml的格式似乎不对。 尝试并更改以下部分的格式。
更换
development:<<:*default database:mysqlapp_development
同
development: <<:*default database:mysqlapp_development