CODEWITHSUNDEEP
ruby
Sakib
Sakib

Reputation: 85

How to create an object of a class which is inside a module and inherited another class?

I want to use a method c of class B. For that class A inherits class B inside the module M. Now, how can I create an object of class A and call c? 

module M  
  class A<B  
    def C  
         puts "From A"  
    end  
  end  
   class B  
     def C  
       puts "From B"  
     end  
   end  
end

I am getting error " uninitialized constant M::B (NameError)"

I am unable to create object and call c like this: 

ob=M::A.new   
ob.C

Upvotes: 0

Views: 731

Answers (2)

Marek Lipka
Marek Lipka

Reputation: 51171

You implement class A that you want to inherit from B before class B. Change this sequence and it will work:

module M
  class B  
    def c
      puts "From B"  
    end  
  end
  class A < B  
    def c
      puts "From A"  
    end  
  end  
end
obj = M::A.new
ob.c
# From A

I also corrected method named with capital letter. It's possible, but not recommended.

Upvotes: 1

kwood
kwood

Reputation: 11004

If you run this example, you are getting the following error:

NameError: uninitialized constant M::B

So B is not found. As soon as you add it to your code, everything works fine:

class B
end

module M  
  class A < B  
    def c  
      puts "Test"
    end
  end
end

ob = M::A.new  
ob.c

# >> Test

Upvotes: 0

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