What is Ruby on Rails MVC?

• The Model View Controller principle divides the work of an application into three separate but closely cooperative subsystems.

It basically works as following:

• Requests first come to the controller, controller finds an appropriate view and interacts with model which in turn interacts with database and send response to controller.
• Then controller gives the output to the view based on the response.

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What is a Model?

• The models are classes in Rails. They interact with database, store data, handles validation, transaction, etc.
• This subsystem is implemented in ActiveRecord library.
• This library provides an interface between database tables and Ruby program code that manipulates database records.
• Ruby method names are automatically generated from database tables field names

What is a View?

• View represent data in a particular format in an application for the users.
• It handles HTML, CSS, JavaScript and XML in an application.
• They do what controller tells them.
• This subsystem is implemented in ActionView library.
• This library is an Embedded Ruby (Erb) based system which define presentation templates for data presentation.

What is a Controller?

• Controller directs traffic to views and models.
• It query models for data from the database and display the desired result with the help of view in an application.
• This subsystem is implemented in ActionController library.
• This library is a data broker sitting between ActiveRecord and ActionView.

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Directory Representation of MVC Framework

• Assuming a standard, default installation over Linux, you can find them like this

tp> cd /usr/local/lib/ruby/gems/2.2.0/gems

tp> ls

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• You will see subdirectories including (but not limited to) the following
• actionpack-x.y.z
• activerecord-x.y.z
• rails-x.y.z

Over a windows installation, you can find them like this

tp>cd ruby\lib\ruby\gems\2.2.0\gems

ruby\lib\ruby\gems\2.2.0\gems\>dir

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You will see subdirectories including (but not limited to) the following

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ActionView and ActionController are bundled together under ActionPack.

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