Originally posted January 2020, but here it is now!
What they say is true - Ruby on Rails is powerful (and magical!). But to really appreciate that power and magic, you'd have to build an app from the ground up. Let's work through that initial setup of creating folders and files to get a Rails app up and running.
Let's build a coupon application, which stores coupon codes and the stores they belong to.
Create a coupon model in a folder models
in a file coupon.rb
:
class Coupon < ActiveRecord::Base
end
Create the table and migrate it. Go into your db
folder and create a new folder, migrate
, and within that folder, a new file, 001_create_coupons.rb
:
class CreateCoupons < ActiveRecord::Migration
def change
create_table :coupons do |t|
t.string :coupon_code
t.string :store
t.timestamps null: false
end
end
end
Migrate by running bin/rails db:migrate RAILS_ENV=test
and look at your schema file afterwards to ensure all looks well.
Create the CouponsController
located in the controllers
folder:
class CouponsController < ApplicationController
end
Create the routes within the folder config
and the file routes.rb
:
Rails.application.routes.draw do
resources :coupons, only: [:index, :show, :create, :new]
end
The resources
route maps HTTP verbs to controller actions automatically - just the beginning of the magic
Start building out the CouponsController
:
class CouponsController < ApplicationController
def index
@coupons = Coupon.all
end
def show
@coupon = Coupon.find(params[:id])
end
def new
end
def create
@coupon = Coupon.new
@coupon[:coupon_code] = params[:coupon][:coupon_code]
@coupon[:store] = params[:coupon][:store]
@coupon.save
redirect_to coupon_path(@coupon)
end
end
At any point, type rails routes
in the terminal to see the created routes.
Start mapping out the views within the folder views
and folder coupon
and your file names will look like this:
index.html.erb
new.html.erb
show.html.erb
The rest is ensuring your views display what you intend them to display, using your console for testing, and seeing what your browser displays - errors, empty content or your actual content.
Cheers to building your own Rails app from scratch, and may you enjoy the power and magic!
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