Difference between revisions of "Ruby on Rails"
From Hawk Wiki
| (7 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
| + | ==Tutorials== | ||
Beginner's tutorial<br> | Beginner's tutorial<br> | ||
http://allaboutruby.wordpress.com/2006/01/09/installing-rails-on-windows-step-by-step-tutorial/<br> | http://allaboutruby.wordpress.com/2006/01/09/installing-rails-on-windows-step-by-step-tutorial/<br> | ||
| Line 4: | Line 5: | ||
http://www.ruby-lang.org/en/documentation/quickstart/<br> | http://www.ruby-lang.org/en/documentation/quickstart/<br> | ||
| − | + | ==nil?, empty? and blank?== | |
| + | <pre class="brush:ruby"> | ||
.nil? can be used on any object and is true if the object is nil. | .nil? can be used on any object and is true if the object is nil. | ||
| Line 12: | Line 14: | ||
Array length == 0 | Array length == 0 | ||
Hash length == 0 | Hash length == 0 | ||
| + | |||
| + | Running .empty? on something that is nil will throw a NoMethodError. | ||
| + | |||
| + | .blank? will operate on any object | ||
| + | nil.blank? == true | ||
| + | false.blank? == true | ||
| + | [].blank? == true | ||
| + | {}.blank? == true | ||
| + | "".blank? == true | ||
| + | 5.blank? == false | ||
| + | " ".blank? == true | ||
| + | " ".empty? == false | ||
| + | </pre> | ||
| + | <h3>How to skip active record in rails 3</h3> | ||
| + | 1. Create new rails project with | ||
| + | <pre class="brush:ruby"> | ||
| + | rails new myApp --skip-activerecord | ||
| + | </pre> | ||
| + | 2. | ||
| + | |||
| + | In application.rb, remove the require 'rails/all' line and instead add these lines: | ||
| + | <pre class="brush:ruby"> | ||
| + | require "action_controller/railtie" | ||
| + | require "action_mailer/railtie" | ||
| + | require "active_resource/railtie" | ||
| + | require "rails/test_unit/railtie" | ||
| + | require "sprockets/railtie" | ||
| + | </pre> | ||
| + | Also see Remove ActiveRecord in Rails 3 and look into the Active Model railscast | ||
| + | |||
| + | Rails 3.2.x: | ||
| + | |||
| + | You'll also need to remove/comment out this line in application.rb | ||
| + | <pre class="brush:ruby"> | ||
| + | config.active_record.whitelist_attributes = true | ||
| + | </pre> | ||
| + | And remove/comment these two lines from development.rb | ||
| + | <pre class="brush:ruby"> | ||
| + | config.active_record.mass_assignment_sanitizer = :strict | ||
| + | config.active_record.auto_explain_threshold_in_seconds = 0.5 | ||
| + | </pre> | ||
| + | Rails 2.x: | ||
| + | |||
| + | In config/environment.rb add (or uncomment) the line | ||
| + | <pre class="brush:ruby"> | ||
| + | config.frameworks -= [ :active_record, :active_resource, :action_mailer ] | ||
| + | </pre> | ||
| + | This will cause Rails not to use those frameworks. (Note the nearly-invisible -= !) | ||
Latest revision as of 00:20, 20 February 2015
Tutorials
Beginner's tutorial
http://allaboutruby.wordpress.com/2006/01/09/installing-rails-on-windows-step-by-step-tutorial/
Ruby in 20 minutes
http://www.ruby-lang.org/en/documentation/quickstart/
nil?, empty? and blank?
.nil? can be used on any object and is true if the object is nil.
.empty? can be used on strings, arrays and hashes and returns true if:
String length == 0
Array length == 0
Hash length == 0
Running .empty? on something that is nil will throw a NoMethodError.
.blank? will operate on any object
nil.blank? == true
false.blank? == true
[].blank? == true
{}.blank? == true
"".blank? == true
5.blank? == false
" ".blank? == true
" ".empty? == false
How to skip active record in rails 3
1. Create new rails project with
rails new myApp --skip-activerecord
2.
In application.rb, remove the require 'rails/all' line and instead add these lines:
require "action_controller/railtie" require "action_mailer/railtie" require "active_resource/railtie" require "rails/test_unit/railtie" require "sprockets/railtie"
Also see Remove ActiveRecord in Rails 3 and look into the Active Model railscast
Rails 3.2.x:
You'll also need to remove/comment out this line in application.rb
config.active_record.whitelist_attributes = true
And remove/comment these two lines from development.rb
config.active_record.mass_assignment_sanitizer = :strict config.active_record.auto_explain_threshold_in_seconds = 0.5
Rails 2.x:
In config/environment.rb add (or uncomment) the line
config.frameworks -= [ :active_record, :active_resource, :action_mailer ]
This will cause Rails not to use those frameworks. (Note the nearly-invisible -= !)
