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Question 1

Single responsibility principle

Answer 1

The single responsibility principle is a computer programming principle that states that every module or class should have responsibility over a single part of the functionality provided by the software, and that responsibility should be entirely encapsulated by the class

Question 2

What is Rails?

Answer 2

Rails is a web application development framework written

Question 3

Rails two major guiding principles:

Answer 3

Don’t Repeat Yourself:

Convention Over Configuration:

Question 4

Installing Rails

Answer 4

1) $ ruby -v
2) $ sqlite3 –version
3) $ gem install rails
4) $ rails –version

Question 5

Creating a Rails Application

Answer 5

$ rails new app_name
$ bundle install
$ cd app_name

Question 6

What does the folder app/ contain?

Answer 6

Contains the controllers, models, views, helpers, mailers, channels, jobs and assets for your application.

Question 7

What does the folder bin/ contain?

Answer 7

Contains the rails script that starts your app and can contain other scripts you use to setup, update, deploy or run your application.

Question 8

What does the folder config/ contain?

Answer 8

Configure your application’s routes, database, and more. This is covered in more detail in Configuring Rails Applications.

Question 9

whats in config.ru file?

Answer 9

Rack configuration for Rack based servers used to start the application.

Question 10

What does the folder db/ contain?

Answer 10

Contains your current database schema, as well as the database migrations.

Question 11

what’s in Gemfile and

Gemfile.lock file?

Answer 11

These files allow you to specify what gem dependencies are needed for your Rails application. These files are used by the Bundler gem. For more information about Bundler, see the Bundler website.

Question 12

What does the folder lib/ contain?

Answer 12

Extended modules for your application.

Question 13

What does the folder public/ contain?

Answer 13

The only folder seen by the world as-is. Contains static files and compiled assets.

Question 14

what’s in Rakefile?

Answer 14

This file locates and loads tasks that can be run from the command line. The task definitions are defined throughout the components of Rails. Rather than changing Rakefile, you should add your own tasks by adding files to the lib/tasks directory of your application.

Question 15

README.md

Answer 15

This is a brief instruction manual for your application. You should edit this file to tell others what your application does, how to set it up, and so on.

Question 16

What does the folder test/ contain?

Answer 16

Unit tests, fixtures, and other test apparatus. These are covered in Testing Rails Applications.

Question 17

What does the folder tmp/ contain?

Answer 17

Temporary files (like cache and pid files).

Question 18

What does the folder vendor/ contain?

Answer 18

A place for all third-party code. In a typical Rails application this includes vendored gems.

Question 19

gitignore

Answer 19

This file tells git which files (or patterns) it should ignore. See Github - Ignoring files for more info about ignoring files.

Question 20

Starting up the Web Server

Answer 20

$ rails server

Question 21

What is a controller

Answer 21

A controller’s purpose is to receive specific requests for the application.

Question 22

What is routing

Answer 22

Routing decides which controller receives which requests.

Question 23

What is an action

Answer 23

Each action’s purpose is to collect information to provide it to a view.

Question 24

What is a view?

Answer 24

A view’s purpose is to display this information in a human readable format.

Question 25

create a new controller

Answer 25

$ rails generate controller Welcome index

tell it you want a controller called “Welcome” with an action called “index”

Question 26

Setting the Application Home Page

Answer 26

Open the file config/routes.rb in your editor.

add root ‘welcome#index’

Question 27

Whats a resource?

Answer 27

A resource is the term used for a collection of similar objects, such as articles, people or animals

Question 28

What can you do with a resource?

Answer 28

You can create, read, update and destroy items for a resource and these operations are referred to as CRUD operations.

Question 29

where do i add a resource?

Answer 29

resources :articles in config/routes.rb

Question 30

How to see routes?

Answer 30

$ rails routes

Question 31

What environments do rails have?

Answer 31

test, production, and development

Question 32

How do you see the current environment?

Answer 32

in folder config/environment and RAILS_ENV,