Ruby on Rails - mvc - what is mvc - model view controller- ruby on rails tutorial - rails guides - rails tutorial - ruby rails

Model–View–Controller (MVC) is a software architectural pattern for implementing applications and effective fast user interfaces on computers.

It divides a given application into three interconnected parts (Controller - to identify the part of code or path of the code, Model - which database and which table needs to get accessed and finally view to show the respective html data and file.)

The reason for MVC design pattern is -> allowing for efficient code reuse and parallel development.

Its done to separate internal representations of information from the ways information is presented to, and accepted from, the user.

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ruby on rails database access :

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ruby on rails mvc web server access : A user clicks a link to a page in a web application

The web server recieves the request URL (Universal Resource Location - Uniform Resource Locator). Rails uses a routes file to match the URL with a controller action.

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The invoked controller action requests data from a model. The model queries the database and hands data back to the controller

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The controller action then passes data to a corresponding view. The view uses the data and a template to compose a page.

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The controller passes the complete page to the web server.

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The web server serves the page to the browser. The browser renders the new page in place of the first one.

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Ruby on Rails provides a framework for this MVC flow. It enables developers to work on what makes their apps unique rather than spend time re-implementing conventions.

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Ruby on Rails - Model - Resources in MVC

• A model with a controller and a route is called a resource.
• Resources are named with nouns.
• In a health-related application you may find resources such as:
  • Person
  • Vital
  • Goal
  • Prescription

Ruby on Rails - Attributes in Resources of MVC model

Attributes (or data) of a resource are accessed through the model.

Attributes (model methods) are also named with nouns.

A person model may have methods such as:

• Person.date_of_birth
• Person.height
• Person.gender
• Person.allergies

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Ruby on Rails - Action and Attributes in Resources for MVC model

Actions available to a resource are accessed through the controller.

Actions (controller methods) are named with verbs.

Controllers typically have one or more standard methods such as:

• PersonController.create
• PersonController.show
• PersonController.update
• PersonController.destroy

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Ruby on Rails - Resources action and Attributes in Resources for MVC model - Embedded Ruby

Resource actions may be visualized in a page, from a view template.

Names of view templates correspond to controller methods.

Templates corresponding to standard controller methods are:

• person/create.html.erb
• person/show.html.erb
• person/update.html.erb
• person/destroy.html.erb