Ruby on Rails Directory Structure

On creating a Rails application, the entire Rails directory structure is created. We will explain Rails 5 directory structure here.

The jtp directory (shown below) has a number of auto-generated files and folders that comprises the structure of Rails application.

We will explain the function of each of the files and folders present in the above directory.

File/Folder	Description
app	It works as the remainder of this directory. Basically it organizes our application component. It holds MVC.
app/assets	This folder contains static files required for application's front-end grouped into folders based on their type.
app/controllers	All the controller files are stored here. A controller handles all the web requests from the user.
app/helpers	It contains all the helper functions to assist MVC.
app/mailers	It contains mail specific functions for the application.
app/models	It contains the models and data stored in our application's database.
app/views	This folder contains the display templates to fill data in our application.
bin	It basically contains Rails script that start your app. It can also contain other scripts use to setup, upgrade or run the app.
config	It configures our application's database, routes and more.
db	It contains our current database schema and database migrations.
lib	It contains extended module for your application.
log	It contains application log files.
public	It contains static files and compiled assets. This is the only folder seen by the world.
test	It contains unit tests, other test apparatus and fixtures.
tmp	It contains temporary files like cache and pid files.
vendor	It contains all third-party code like vendor gems.
Gemfile	Here all your app's gem dependencies are declared. It is mandatory as it includes Rails core gems among other gems.
Gemfile.lock	It holds gems dependency tree including all versions for the app.
README.md	It is a brief instruction manual for your application.
Rakefile	It locates and loads tasks that can be run from the command line.
config.ru	Rack configuration for Rack based servers used to start the application.