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Neha  Jaggi / Professional / Web Technology

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Lessons:- Inheritance Hierarchies

  Inheritance Hierarchies

We end our discussion of the demo application with a brief description of the controller and model class hierarchies in Rails. This discussion will only make sense if you have some experience with object-oriented programming (OOP); if you haven’t studied OOP, feel free to skip this section. In particular, if you are unfamiliar with classes (discussed in Section 4.4), I suggest looping back to this section at a later time.

We start with the inheritance structure for models. Comparing Listing 2.12 and Listing 2.13, we see that both the User model and the Micropost model inherit (via the left angle bracket <) from ActiveRecord::Base, which is the base class for models provided by ActiveRecord; a diagram summarizing this relationship appears in Figure 2.16. It is by inheriting from ActiveRecord::Base that our model objects gain the ability to communicate with the database, treat the database columns as Ruby attributes, and so on.




Neha  Jaggi

Skills    Ruby On Rails

Qualifications :- High School - , College/University - Graphic Era Hill University, Dehradun, College/University - ,
Location :-Dehradun,Dehradun,UTTARAKHAND,India

Experienced Software Developer with a demonstrated history of working in the Information Technology and services industry. Skilled in Web Technologies (Ruby on Rails, PostgreSQL, php, Laravel and AJAX). 


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