Broken free weekly Rails (e)
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With no arguments, sets the default visibility for subsequently defined methods to . With arguments, sets the named methods to have visibility.
Many things in Ruby is just method!
2. System
Executes cmd in a subshell, returning true if the command was found and ran successfully, false otherwise. An error status is available in $?. The arguments are processed in the same way as for Kernel:: exec.
system("echo *")
system("echo", "*") # echo "*"
produces:
config.h main.rb *
3. `
Returns the standard output of running cmd in a subshell. The built-in syntax% x (...) uses this method. Sets $? To the process status.
`date` #=> "Wed Apr 9 08:56:30 CDT 2003\n" `ls testdir`.split[1] #=> "main.rb" `echo oops && exit 99` #=> "oops\n" $?.exitstatus #=> 99
4. Reload
Reloads the of this object from the database. The optional options argument is passed to when reloading so you may do eg record.reload (: lock => true) to the same record with an exclusive row lock.
When do you need to do reload? When you hold a object whose state may be changed by others.
5. Render: partial => 'shared / search', locals => (: objects => ...)
Why do we need locals? Partial is designed for reuse, so, you donot have to have the same name instance variable in your action, and locals make the reuse possible.
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