Build a CRUD Web App with Ruby on Rails

Build a CRUD Web App with Ruby on Rails

If you are fairly new to Ruby on Rails (or forgot how to use it) and need a quick guide to creating a CRUD (create, read, update, destroy) web application, then you’ve come to the right place!

If you are fairly new to Ruby on Rails (or forgot how to use it) and need a quick guide to creating a CRUD (create, read, update, destroy) web application, then you’ve come to the right place!

Below I have written some simple steps to creating a very simple application, linked to some documentation or a tutorial for each step, and included an example of what you might write for each step.

Here’s a nice, simple tutorial that gives some more context and explanation and walks you through these steps. This guide is also fairly easy to follow, much longer, and more detailed.

  1. Create a new app
rails new pets-app

  1. Launch a server and go to http://localhost:3000 in your browser to view your app
rails s

  1. Create models
rails g model owner first_name last_name age:integer email
rails g model pet name species owner_id:integer owner:belongs_to

  1. Set up associations
class Owner < ApplicationRecord
  has_many :pets
end

  1. Add validations
class Owner < ApplicationRecord
  has_many :pets
  validates :name, presence: true
end

  1. Run migrations
rails db:migrate

  1. Check your schema by looking at the db/schema.rb file

  2. Seed your database

Owner.create!(first_name:"Dan", last_name:"Weirdo", age: 18, email:"[email protected]")
Pet.create!(name:"Snowball", species:"dog", owner_id:1)

  1. Test associations
Owner.first.pets
Pet.first.owner

  1. Test validations
owner = Owner.new(first_name: "")
owner.valid?
owner.errors.messages

  1. Create controllers and views
rails g controller owners index show new create edit update destroy
rails g controller pets index show new create edit update destroy

  1. Create routes using resources or manual routes
resources :pets
resources :owners

  1. Make sure your routes are working correctly by running your server

(rails s) and looking at each path that you created (i.e. /pets)

  1. Add/edit controller actions

Hint: scroll to the bottom for an example of standard controller actions

  1. Add/edit view files

Hint: “find on page” “new.html”, “index.html”, etc. to see examples

Another hint: the form_for helper

That’s it! Make sure you test your code as you go, and commit often.

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