Adam Speaks Out Of Turn

 1 # has_many :categories, :through => :categorizations
 2 
 3 has_many :categorizations
 4 
 5 has_and_belongs_to_many :categories,
 6   :join_table => "categorizations",
 7   :left_foreign_key => "post_id",
 8   :right_foreign_key => "category_id",
 9   :class => "Category"

 1 sudo gem install merb
 2 sudo gem install data_objects
 3 sudo gem install do_sqlite3
 4 sudo gem install do_mysql
 5 sudo gem install datamapper
 6 sudo gem install merb_datamapper
 7 
 8 # if you see a dyld: NSLinkModule() error
 9 
10 sudo mkdir /usr/local/mysql/lib/mysql
11 cd /usr/local/mysql/lib/mysql
12 sudo ln -s /usr/local/mysql/lib/*.dylib .

 1 # Strings
 2 String.new(str="")
 3 "new string here"
 4 %{new string}
 5 %Q{ new string with ' and " escaped }
 6 "I want #{variable} expressed" # expressing a variable in a string
 7 
 8 # Arrays
 9 Array.new
10 Array.new(size=0, obj=nil) # array of size length filled with objs
11 Array.new(size) {|index| block } # array of size length filled with result of block
12 [foo, bar, bitty]
13 %w{foo bar bitty} 
14 
15 # Hashes
16 Hash.new
17 Hash.new(obj) # hash whose new values default to obj
18 Hash.new {|hash, key| block } # hash whose new values default to result of block
19 { "foo" => "bar", "bitty" => 0}
20 
21 # Regex
22 Regexp.new(string [, options [, lang]]) # supply a string
23 Regexp.new(regexp) # introspective
24 Regexp.compile(string [, options [, lang]]) # supply a string
25 Regexp.compile(regexp) # supply a regex
26 /regex/
27 %r{regex} # => regex with escaped /