1 大家一起来写歌,歌曲创作共享.哼歌返回五线谱
2 index方法
3 images/下的jpg等文件，link的相对路径直接写文件名即可，
TODO:
=======
module和class区别，什么场合用module？
局部变量，实例变量和符号（:）区别？
puts Symbol.all_symbols可以看见symbol表中的所有symbol
创建数据库表，例如创建sessions表
rake db:sessions:create
rake db:migrate
建立sessions表具有特殊意义，代表session信息。
如果建立products表
常用命令：
===========
rails
========
1. 创建项目
rails new my_app
2. 建立一个person框架，包括person数据表，controller, view, test,models
rails g scaffold person name:string bio:text birth:date
3 启动服务器
rails server
=====
rake --tasks 查看所有命令
=====
rake about????????????? # List versions of all Rails frameworks and the env...
rake assets:clean?????? # Remove compiled assets
rake assets:precompile? # Compile all the assets named in config.assets.pre...
rake db:create????????? # Create the database from config/database.yml for ...
rake db:drop??????????? # Drops the database for the current Rails.env (use...
rake db:fixtures:load?? # Load fixtures into the current environment's data...
rake db:migrate???????? # Migrate the database (options: VERSION=x, VERBOSE...
rake db:migrate:status? # Display status of migrations
rake db:rollback??????? # Rolls the schema back to the previous version (sp...
rake db:schema:dump???? # Create a db/schema.rb file that can be portably u...
rake db:schema:load???? # Load a schema.rb file into the database
rake db:seed??????????? # Load the seed data from db/seeds.rb
rake db:setup?????????? # Create the database, load the schema, and initial...
rake db:structure:dump? # Dump the database structure to an SQL file
rake db:version???????? # Retrieves the current schema version number
rake doc:app??????????? # Generate docs for the app -- also available doc:r...
rake log:clear????????? # Truncates all *.log files in log/ to zero bytes
rake middleware???????? # Prints out your Rack middleware stack
rake notes????????????? # Enumerate all annotations (use notes:optimize, :f...
rake notes:custom?????? # Enumerate a custom annotation, specify with ANNOT...
rake rails:template???? # Applies the template supplied by LOCATION=(/path/...
rake rails:update?????? # Update configs and some other initially generated...
rake routes???????????? # Print out all defined routes in match order, with...
rake secret???????????? # Generate a cryptographically secure secret key (t...
rake stats????????????? # Report code statistics (KLOCs, etc) from the appl...
rake test?????????????? # Runs test:units, test:functionals, test:integrati...
rake test:recent??????? # Run tests for {:recent=>"test:prepare"} / Test re...
rake test:single??????? # Run tests for {:single=>"test:prepare"}
rake test:uncommitted?? # Run tests for {:uncommitted=>"test:prepare"} / Te...
rake time:zones:all???? # Displays all time zones, also available: time:zon...
rake tmp:clear????????? # Clear session, cache, and socket files from tmp/ ...
rake tmp:create???????? # Creates tmp directories for sessions, cache, sock...
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