When browsing the internet about ruby on rails, I see the word super. Can someone tell what it is and what it can do?

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4 Answers

super method calls the parent class method.

for example:

class A def a # do stuff for A end end class B < A def a # do some stuff specific to B super # or use super() if you don't want super to pass on any args that method a might have had # super/super() can also be called first # it should be noted that some design patterns call for avoiding this construct # as it creates a tight coupling between the classes. If you control both # classes, it's not as big a deal, but if the superclass is outside your control # it could change, w/o you knowing. This is pretty much composition vs inheritance end end

If it is not enough then you can study further from here

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when you are using inheritance if you want to call a parent class method from child class we use super

c2.1.6 :001 > class Parent 2.1.6 :002?> def test 2.1.6 :003?> puts "am in parent class" 2.1.6 :004?> end 2.1.6 :005?> end => :test_parent 2.1.6 :006 > 2.1.6 :007 > class Child < Parent 2.1.6 :008?> def test 2.1.6 :009?> super 2.1.6 :010?> end 2.1.6 :011?> end => :test_parent 2.1.6 :012 > Child.new.test am in parent class => nil 2.1.6 :013 >

There are different ways we can use super(ex: super, super()).

It was used to implement super class implementation of the current method. Within the body of a method, calls to super acts just like a call to that original method. And The search for a method body starts in the superclass of the object that was found to contain the original method.

def url=(addr) super (addr.blank? || addr.starts_with?('http')) ? addr : end

Ruby uses the super keyword to call the superclass implementation of the current method. Within the body of a method, calls to super acts just like a call to that original method. The search for a method body starts in the superclass of the object that was found to contain the original method.

def url=(addr) super (addr.blank? || addr.starts_with?('http')) ? addr : end