Creating migrations in Ruby on Rails - Try It Yourself

Creating Migrations in Rails

📖 Scenario: You are building a simple blog application. You need to create a database table to store posts with their titles and content.

🎯 Goal: Create a Rails migration to add a posts table with title and content columns.

📋 What You'll Learn

Create a migration file named create_posts

Add a posts table with title as a string column

Add a content column as text

Include timestamps in the table

💡 Why This Matters

🌍 Real World

Migrations help developers safely change the database structure as the app grows, like adding new tables or columns.

💼 Career

Understanding migrations is essential for backend and full-stack developers working with Rails to manage database changes efficiently.

1

Generate the migration file

Run the Rails command to generate a migration named create_posts.

Ruby on Rails

# Run the command to generate the migration
# Your code here

Need a hint?

Use rails generate migration create_posts to create the migration file.

2

Define the posts table structure

In the generated migration file, add a create_table :posts block with columns title as string and content as text.

Ruby on Rails

class CreatePosts < ActiveRecord::Migration[7.0]
  def change
    # Add create_table block here
    # Your code here
  end
end

Need a hint?

Use create_table :posts do |t| and add t.string :title and t.text :content inside the block.

3

Add timestamps to the posts table

Inside the create_table :posts block, add t.timestamps to include created_at and updated_at columns.

Ruby on Rails

class CreatePosts < ActiveRecord::Migration[7.0]
  def change
    create_table :posts do |t|
      t.string :title
      t.text :content
      # Add timestamps here
      # Your code here
    end
  end
end

Need a hint?

Add t.timestamps inside the create_table block to add time columns.

4

Run the migration to update the database

Run the Rails command to apply the migration and create the posts table in the database.

Ruby on Rails

# Run the command to migrate the database
# Your code here

Need a hint?

Use rails db:migrate to apply the migration.