Active Record pattern in Ruby on Rails - Mini Project: Build & Apply

Building a Simple Blog Post Model with Active Record

📖 Scenario: You are creating a simple blog application. You want to store blog posts with a title and content in a database using Rails' Active Record pattern.

🎯 Goal: Build a Rails model called Post using Active Record that can save and retrieve blog posts with a title and content.

📋 What You'll Learn

Create a Post model inheriting from ApplicationRecord

Add attributes title and content to the model

Create a new Post instance with a title and content

Save the Post instance to the database

💡 Why This Matters

🌍 Real World

Active Record is the main way Rails applications interact with databases to create, read, update, and delete data.

💼 Career

Understanding Active Record is essential for Rails developers building web applications that store and manage data.

1

Create the Post model

Create a Rails model class called Post that inherits from ApplicationRecord.

Ruby on Rails

# Your code here
class Post < ApplicationRecord
end

Need a hint?

In Rails, models inherit from ApplicationRecord to use Active Record features.

2

Add attributes to the Post model

Assume the database table posts has columns title and content. No code change is needed here because Active Record automatically maps these columns to attributes.

Ruby on Rails

class Post < ApplicationRecord
  # Active Record automatically maps columns to attributes
end

Need a hint?

Active Record automatically provides attribute accessors for database columns.

3

Create a new Post instance

Create a new Post instance called post with title set to 'My First Post' and content set to 'Hello, this is my first blog post.'.

Ruby on Rails

class Post < ApplicationRecord
end

# Create a new Post instance
# Your code here

Need a hint?

Use Post.new with a hash of attributes to create a new instance.

4

Save the Post instance

Call the save method on the post instance to save it to the database.

Ruby on Rails

class Post < ApplicationRecord
end

post = Post.new(title: 'My First Post', content: 'Hello, this is my first blog post.')

# Save the post to the database
# Your code here

Need a hint?

Use save to store the new record in the database.