Reserved Words in Rails

To find out if a given name is reserved in Rails programmatically, check out this How to find out if a name is reserved in Rails 4.2.5.

* ADDITIONAL_LOAD_PATHS
* ARGF
* ARGV
* ActionController
* ActionView
* ActiveRecord
* ArgumentError
* Array
* BasicSocket
* Benchmark
* Bignum
* Binding
* CGI
* CGIMethods
* CROSS_COMPILING
* Class
* ClassInheritableAttributes
* Comparable
* ConditionVariable
* Config
* Continuation
* DRb
* DRbIdConv
* DRbObject
* DRbUndumped
* Data
* Date
* DateTime
* Delegater
* Delegator
* Digest
* Dir
* ENV
* EOFError
* ERB
* Enumerable
* Errno
* Exception
* FALSE
* FalseClass
* Fcntl
* File
* FileList
* FileTask
* FileTest
* FileUtils
* Fixnum
* Float
* FloatDomainError
* GC
* Gem
* GetoptLong
* Hash
* IO
* IOError
* IPSocket
* IPsocket
* IndexError
* Inflector
* Integer
* Interrupt
* Kernel
* LN_SUPPORTED
* LoadError
* LocalJumpError
* Logger
* Marshal
* MatchData
* MatchingData
* Math
* Method
* Module
* Mutex
* Mysql
* MysqlError
* MysqlField
* MysqlRes
* NIL
* NameError
* NilClass
* NoMemoryError
* NoMethodError
* NoWrite
* NotImplementedError
* Numeric
* OPT_TABLE
* Object
* ObjectSpace
* Observable
* Observer
* PGError
* PGconn
* PGlarge
* PGresult
* PLATFORM
* PStore
* ParseDate
* Precision
* Proc
* Process
* Queue
* RAKEVERSION
* RELEASE_DATE
* RUBY
* RUBY_PLATFORM
* RUBY_RELEASE_DATE
* RUBY_VERSION
* Rack
* Rake
* RakeApp
* RakeFileUtils
* Range
* RangeError
* Rational
* Regexp
* RegexpError
* Request
* RuntimeError
* STDERR
* STDIN
* STDOUT
* ScanError
* ScriptError
* SecurityError
* Signal
* SignalException
* SimpleDelegater
* SimpleDelegator
* Singleton
* SizedQueue
* Socket
* SocketError
* StandardError
* String
* StringScanner
* Struct
* Symbol
* SyntaxError
* SystemCallError
* SystemExit
* SystemStackError
* TCPServer
* TCPSocket
* TCPserver
* TCPsocket
* TOPLEVEL_BINDING
* TRUE
* Task
* Text
* Thread
* ThreadError
* ThreadGroup
* Time
* Transaction
* TrueClass
* TypeError
* UDPSocket
* UDPsocket
* UNIXServer
* UNIXSocket
* UNIXserver
* UNIXsocket
* UnboundMethod
* Url
* VERSION
* Verbose
* YAML
* ZeroDivisionError

Other names that have been reported to cause trouble:

* accept
* callback – breaks validation if used as a model method.
* categorie
* action
* attributes – if you have a has_many called attributes, you can’t access to your object attributes anymore; only the associated objects
* application2
* @base_path – setting this variable name in a controller method seems to break the ablity to render a partial in the view. The view will render with no content and no errors will be generated .
* connection – there seems to be a connection class already
* database – (in mysql)
* dispatcher
* display1
* drive – fixtures will not autogenerate IDs in Rails 2.0.2
* errors
* format
* host – I had a text_field :host, :name that I saw problems with. (JR)
* key
* layout – If you have a model called Layout and in a controller have “scaffold :layout” it generates an exception. However, if you script/generate the scaffold for layout it works.
* load – When making an Ajax call to an action named load, the action’s code will be skipped (or otherwise rendered useless). This is made apparent by: a) @variables are not available in the view, b) calling render :layout => false still yields the layout.
* link – breaks migrations when used as a column name in combination with validation: ticket
* new, override to news if you want a news table
* notify – not a valid column name
* open – not a valid column name
* public
* quote ‘quote’ cannot be used as a column name
* render – cannot be used as an action name
* request
* records – a table named records seemed to cause duplicate entries to be found by find
* responses – scaffold borks with "undefined method ‘body=’ "
* save – ActiveRecord uses this to save the object.
* scope – do not use as an association name because ActiveRecord::Base.scope is called instead
* send
* session (session_controller or SessionController will not work)
* system – a table column named system causes problems when trying to generate scaffold
* template – a table named templates causes an error when you try to invoke the create method of the default controller
* test (however those work with ruby test/unit/axistest.rb_ and rake testunits_)
* timeout – an ActiveRecord attribute named timeout will clash with the global function “timeout” defined in Ruby’s timeout.rb
* to_s — naming a model instance method to_s resulted in ‘File not found’ for any view an object of this class (should have) appeared in (no matter which method called) and WebRick had to be restarted. I couldn’t drag the very cause into light, but in the traces ‘to_s’ gave me a hint. After renaming everything worked well again.
* type — or any of the other MagicFieldNames
* URI
* visits — a table column named visits causes problems when trying to query some_obj.visits.
* Observer — for a model name works in development environment but not in production.
singular names finishing in “s”: Axis → Axes, Access → Accesses, will break the pluralization in rake: Axi, Acces

Monitor cannot be used. It is a Ruby class that is related to threading.

List of Magic Field Names

* created_at
* created_on
* updated_at
* updated_on
* lock_version
* type
* id
* #{table_name}_count
* position
* parent_id
* lft
* rgt
* quote_value (is used for quoting)
* template

uninstalling rake 0.9.2

gem uninstall rake
ERROR: While executing gem ... (Gem::InstallError)
cannot uninstall, check `gem list -d rake`

1) gem list -d rake

gives:

*** LOCAL GEMS ***

rake (0.9.2, 0.8.7)
Author: Jim Weirich
Rubyforge: http://rubyforge.org/projects/rake
Homepage: http://rake.rubyforge.org
Installed at (0.9.2): /Users/bparanj/.rvm/gems/ruby-1.9.2-p180@global
(0.8.7): /Users/bparanj/.rvm/gems/ruby-1.9.2-p180@global

2) rvm use @global && gem uninstall rake -v 0.9.2

uninstalls rake

Installing Ruby Debug

1) From the root of the project run:
gem install ruby-debug19 -- --with-ruby-include="$rvm_path/src/$(rvm tools identifier)/"

2) Include in Gemfile

group :test, :development do
gem ‘ruby-debug19′, :require => ‘ruby-debug’
end

3) Create a .rdebugrc in your home directory

set autolist
set autoeval
set autoreload
set forcestep


4)
Specify how you would like Rails to report deprecation notices for your bugger environment, set
config.active_support.deprecation to :log, :notify or :stderr at config/environments/bugger.rb


5) require 'ruby-debug' in development.rb. Edit source where you want to debug to include :

debugger

6) Start server in debug mode:
rails s -d

References

http://pivotallabs.com/users/chad/blog/articles/366-ruby-debug-in-30-seconds-we-don-t-need-no-stinkin-gui-
http://bashdb.sourceforge.net/ruby-debug.html
http://railscasts.com/episodes/54-debugging-with-ruby-debug

Uninstall all Gems in Ubuntu 10.04

gem list | cut -d" " -f1 | xargs sudo gem uninstall -aIx

Reference: Remove All Ruby Gems