write to stand error
ex:warn "error" if ($DEBUG)
enable $DEBUG
ruby -d
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- symbol
- methods
- compare: equal?, Comparable module
- true, false & nil
- for, each
- loop, while, until
- case
- private & protected methods
- global variable
- instance variable
- class & self
- :: access
- method_missing
- super keyword
- root module & root class
- attr_reader, attr_writer,
- respond_to?
- object_id
- the data controller can access
- mysql command
- rails source code location in mac
- require vs load
- puts and print
- gets
- paginate
- helper
- h( )
- xml template
- cache
- verification
- redirect_to
- logger
- group controllers into module
- rails program load sequence
- flash
- session & cookie
- controller action, view tempelate, render
- form helper
- save & save!
- update_attributes, updat & update_all, save
- find method in rails
- ActionMailer & gmail
- access table's column in the model
- before_create
- filter
- mongrel
- link
- layout
- rails routing
- generate command, rails command, rake command, c...
- erube
- cgi
- send
- show message with debug
- xml library
- <=>
- test
- ri command
- alias
- system
- method naming ( end with ? or ! )
- change value to string( interpolation)
- file methods
- environment variable
- comment
- if , else, elsif, unless
- plugin install
- textmate & rails 2.0
- textmate shortcut
- visor : terminal access
- date and time method
- block and yield
- here doc
- required, optional, default-valued parameters
- block, proc and &
- lambda and proc
- IDE
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