We can write namspaced classes in ruby in two ways.
In the normal way we can wrap the class inside a module. Lets say the module name as ‘MyModule’.
And the constants we define inside this module are accessed as follows:
module MyModule CONST1 = 1 class Myclass CONST2 = 2 def name "This is my name" end def const_1 CONST1 end def const_2 CONST2 end end end p MyModule::Myclass.new.name p MyModule::Myclass.new.const_1 p MyModule::Myclass.new.const_2
The other way of doing this is the short way of writing the class name with module name and two columns.
As you can see, the const_1 is accessed as prefixing the module name with two columns.
module MyModule CONST1 = 1 end class MyModule::Myclass CONST2 = 2 def name "This is my name" end def const_1 MyModule::CONST1 end def const_2 CONST2 end end p MyModule::Myclass.new.name p MyModule::Myclass.new.const_1 p MyModule::Myclass.new.const_2
There is an another way of doing this, that may looks strange to most of the people. Nested classes.
class Myclass def name "This is my name" end def my_class_2_name Myclass2.new.name end class Myclass2 def name Myclass.new.name end end end > p Myclass.new.name > "This is my name" > p Myclass.new.my_class_2_name > "This is my name"
The two printing works. So what is the use of these nested classes? Hmmm. It is just namespacing the second class and it tells, somehow it relates to first class even though there is no relation between these two classes.
> p Myclass2.new.name > uninitialized constant Myclass2
We cannot access Myclass2 without specifying the namespace ( Myclass )
> p Myclass::Myclass2.new.name > "This is my name"