"foo_and_bars".classify # => "FooAndBar" #String
"foo_and_bars".classify.constantize # => "FooAndBar" #Class
# in case of singular names
"business".classify # => "Busines"
"business".camelize # => "Business"
"business".camelize.constantize #=> "Business" #Class
class_eval is called on a class object and is used to create instance methods for the class at runtime.
%w(administrator developer teamlead tester).each do |user|
class_eval <<-EOR
def is_#{user}?
site == "MYACCOUNT_#{org.upcase}" ...
class Myclass
def one
puts "one is called"
end
end
ss = Myclass.new
puts Myclass.methods
# returns array of methods for the class. Includes both class and instance methods and methods inherited from parents.
puts Myclass.instanc...
class AbstractModel < ActiveRecord::Base
self.abstract_class = true
end
class Foo < AbstractModel
end
class Bar < AbstractModel
end
Foo and Bar both inherit properties and methods of the Abstract Model while being in separate tables...
To delete sessions based on a hard coded cut-off date:
DELETE FROM sessions WHERE updated_at < STR_TO_DATE('23.05.2013',GET_FORMAT(DATE,'EUR'));
Replacing cut-off date with period of inactivity
DELETE FROM sessions WHERE updated_at ...
In Ruby, class names are constants, so you can do
str = "Thing" #=> "Thing"
Kernel.const_get(str) #=> Thing
As we have object.class method in Ruby, to check the class of a variable in Javascript, here is the snippet
var ss = "some string";
alert (typeof ss); #=> string
alert (typeof pp); #=> undefined
The extend method will mix a module’s methods at the class level.
On the other hand, the include method will mix a module’s methods at the instance level, meaning the methods will become instance methods of the class.
module Stringify
# R...
attr_accessor is used to create setter and getter methods for instance variables so that they can be accessed outside the class. initialize is the special method in ruby that gets called when an object is instantiated.
class Birthday
attr_ac...
In Ruby, send is often introduced as a way to show how everything is an object
1.send(:+, 1) ## -> 2
It can also be used to call private or protected methods from outside a given class as explained below.
class Myclass
def method...
After installing sublime text, we must be able to open text files with it. Right click on a text file and you must see the option "open with sublime text". In case you don't , click Open with other applications and you should see Sublime text opti...