Seed data in Ruby on Rails - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is seed data in Rails?

Seed data is initial data loaded into the database to set up default values or test data when starting a Rails application.

beginner

Where do you put seed data in a Rails project?

Seed data is placed in the db/seeds.rb file in a Rails project.

beginner

How do you run the seed file to load data into the database?

You run rails db:seed in the terminal to load the seed data into the database.

beginner

Why is seed data useful in development?

Seed data helps quickly set up the database with example or default data so developers can test and work without manually entering data.

beginner

What is a simple example of adding seed data in db/seeds.rb?

Example: <br>User.create(name: 'Alice', email: '[e-mail]') adds a user named Alice to the database.

Where is seed data stored in a Rails project?

A lib/tasks/seed.rb

B db/seeds.rb

C config/initializers/seed.rb

D app/models/seed.rb

Seed data is stored in the db/seeds.rb file.

Which command loads seed data into the database?

A rails db:seed

B rails db:migrate

C rails db:create

D rails db:rollback

The command rails db:seed loads the seed data.

What is the main purpose of seed data?

A To deploy the app

B To create database tables

C To run tests automatically

D To set up initial data for the app

Seed data sets up initial or default data for the application.

Which of these is a valid seed data line in db/seeds.rb?

A User.create(name: 'Bob', email: '[e-mail]')

B rails generate user

C db:migrate User

D seed run User

User.create(...) is how you add seed data in db/seeds.rb.

When should you use seed data?

A To style the website

B To write application logic

C To fill the database with default or test data

D To configure server settings

Seed data is used to fill the database with default or test data.

Explain what seed data is and why it is useful in Rails development.

Think about how you prepare your app's database before using it.

Describe the steps to add and load seed data in a Rails project.

Consider where the seed file is and how to run it.