Ruby On Rails Cheat Sheet

1. Methods
DEFAULT DIRECTORY STRUCTURE PRE-DEFINED VARIABLES
Arrays
$! Exception information
rails_root
assoc
$& String of last match
app at
$` String left of last match clear
apis
$' collect!
String right of last match
controllers
compact!
$+ Last group of last match
application.rb concat
$N Nth group of last match
helpers delete
$= Case insensitive flag delete_at
application_helper.rb
delete_if
$/ Input record separator
models
Methods each
$ Output record separator
views each_index
$, Output field separator
Strings empty?
layouts
capitalize! eql?
$. Current line number of
components
center
fill
last file read
chomp! config first
chop! $> Default output for print
environments flatten!
concat
$_ Last input line of string
count include?
development.rb
crypt index
$0 Name of script
production.rb
delete! indexes
$* Command line arguments
downcase! test.rb join
dump $stderr Standard error output last
database.yml
each
length
$stdin Standard input
each_byte environment.rb
nitems
empty? $stdout Standard output
routes.rb
gsub! pack
$-a True if -a is set.
hash db pop
hex $-d Status of -d switch push
doc
include?
rassoc
$-l True if -l is set
index lib reject!
intern $-p True if -p is set
log replace
length
$-v Verbose Flag
ljust, rjust reverse!
development.log
next! reverse_each
production.log
oct rindex
replace RESERVED WORDS
server.log shift
reverse!
slice!
test.log
rindex rescue
=begin elsif sort!
scan public
uniq!
retry
=end end
slice!
images
split unshift
return
BEGIN ensure
squeeze! javascripts
self
END false
strip! Validation
controls.js
sub! super
alias for condition_block?
sum dragdrop.js
create!
then
and if
swapcase!
effects.js evaluate_condition
tr! true
begin in
validate
tr_s! prototype.js
undef
break module
unpack validate_on_create
stylesheets
upcase! validate_on_update
unless
case next
upto .htaccess validates_acceptance_of
until
class nil
404.html validates_associated
Regex when
def not validates_confirmation_of
escape 500.html
while
defined? or validates_each
last_match
dispatch.cgi
new validates_exclusion_of
yield
do redo
quote dispatch.fcgi validates_format_of
else
casefold? validates_inclusion_of
dispatch.rb
kcode
validates_length_of
match favicon.ico
validates_numericality_of
source REGULAR EXPRESSIONS SYNTAX
index.html validates_presence_of
validates_size_of
script
Time
^ Start of string
asctime validates_uniqueness_of
test
ctime $ End of string
fixtures
day Enumerable Mixin
. Any single character
gmt? functional collect
gmtime (a|b) a or b each_with_index
mocks
hour
(...) Group section entries
isdst development
localtime find
[abc] Item in range (a or b or c)
test
mday find_all
[^abc] Not in range (not a or b or c)
min grep
unit
mon a? Zero or one of a include?
test_helper.rb
month
max
a* Zero or more of a
sec vendor min
strftime a+ One or more of a
reject
tv_sec
a{3} Exactly 3 of a
tv_usec sort
usec METHODS NOTE a{3,} 3 or more of a
utc Available free from
a{3,6} Between 3 and 6 of a
utc? ! - Denotes where a tailing ! may be ILoveJackDaniels.com
wday !(pattern) quot;Notquot; prefix. Apply rule when
! - used. A colourless ! denotes that the
yday
URL does not match pattern. Ruby on Rails Logo
year ! - ! is compulsory.
zone used with permission.