Ruby on Rails
From Wikicliki
ruby is a language, rails is a framework object-oriented, general purpose
Contents
rails philosophy
- opinionated
- convention over configuration
- don't repeat yourself
- test driven
- minimal code - maximal effect
the tools
- rails
- rake - like maeke for ruby (an easy way to run tasks)
- git - source code control
- database - SQlite
- heroku - fre rails hosting
the command line
- ls - list
- cd - go to directory (use cd ~ to go backwards)
- pwd - "print working directory"
- echo - repeats it (used to echo out $PATH)
- touch - creates a file
- cat - tells info
- mv - move
- cp - copy
- rm - remove (DELETE FOREVER)
- man <command> - tells you more (press q to get out) (man - manual)
- mkdir - make directory
- rmdir - remove directory
- mdfind - find file (find via spotlight)
Example:
- to rename a file frm file1 to file2 and move file to a different dir: mv file1 dir1/file2
- Current directory: . ("dot")
- Parent directory: .. ("dot dot")
- Home directory: ~ ("tilde")
- Command-K to clear screen
- cat <filename> - prints the file
- ruby <filename> - runs the file
- git status - check git (versioning) status
- git add . - prepare to commit everything all files
- git add <filename> - prepare to commit specific file
- git commit -m - commit that file
- git help <function name>
1.9.3p194 :024 > def test (name="debbie", country="singapore")
1.9.3p194 :025?> puts "My name is #{name}"
1.9.3p194 :026?> puts "My country is #{country}"
1.9.3p194 :027?> end
=> nil
1.9.3p194 :028 > test
My name is debbie
My country is singapore
=> nil
1.9.3p194 :029 >
Naming Conventions
- methods and variables are in snake_case
- classes and modules are in CamelCase
- constants are in ALL_CAPS
Variables
- var # local variable (or method call)
- @var # instance variable
- @@var # class variable
- $var # global variable
- VAR # constant
CRUD
Create new records in the database Read or show the records in the database Update existing records Destroy or delete records
