Note: This post is intended as a supplement to WTF Just Happened? A Quick Tour of Your First Rails App.
Most web applications will have a database attached to them. Within an MVC architecture, we interact with data in our database through our Models using Ruby code. That's right, there is no need to learn SQL!
As a general rule, a model in a Rails application corresponds to a table in a relational database. Our model provides a way for us to treat the database table as if it were just another object in our application.
Our model class is where we can specify any business logic that relates to the object in question. We can also define an association between models.
For our Installfest application, we have the following two models:
class Post < ApplicationRecord has_many :comments validates_presence_of :body, :title end
class Comment < ApplicationRecord belongs_to :post end
We have defined an association between the Post class and the Comments class. Specifically that a post has many comments, and a comment belongs to a post.
We have also included a business rule in the form of a validation that states that the title and the body of a post must not be empty.
The benefits of code reviews
Strategies to make remote work successful
A holistic approach to your web application
reinteractive is Australia’s largest dedicated Ruby on Rails development company. We don’t cut corners and we know what we are doing.
We are an organisation made up of amazing individuals and we take pride in our team. We are 100% remote work enabling us to choose the best talent no matter which part of the country they live in. reinteractive is dedicated to making it a great place for any developer to work.
Webinars are our online portal for tips, tricks and lessons learned in everything we do. Make the most of this free resource to help you become a better developer.
The Ruby on Rails Installfest includes a full setup of your development environment and step-by-step instructions on how to build your first app hosted on Heroku. Over 1,800 attendees to date and counting.
The Ruby on Rails Development Hub is a monthly event where you will get the chance to spend time with our team and others in the community to improve and hone your Ruby on Rails skills.