Running and rolling back migrations in Ruby on Rails - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to run all pending migrations in Rails.

Ruby on Rails

rails db:[1]

Drag options to blanks, or click blank then click option'

Amigrate

Bseed

Crollback

Dconsole

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'rollback' instead of 'migrate' to apply migrations.

Confusing 'seed' with migration commands.

Use rails db:migrate to run all pending migrations and update the database schema.

2fill in blank

medium

Complete the code to rollback the last migration in Rails.

Ruby on Rails

rails db:[1]

Drag options to blanks, or click blank then click option'

Asetup

Bmigrate

Creset

Drollback

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'migrate' which applies migrations instead of rolling back.

Using 'reset' which drops and recreates the database.

The rails db:rollback command undoes the last migration, reverting the database schema by one step.

3fill in blank

hard

Fix the error in the command to rollback the last two migrations.

Ruby on Rails

rails db:rollback [1]2

Drag options to blanks, or click blank then click option'

A--times

B--number

CSTEP=

D--count

Attempts:

3 left

💡 Hint

Common Mistakes

Using '--count' or '--number' which are not valid options.

Omitting the option and just writing a number.

The correct option to specify how many migrations to rollback is STEP=. So the full command is rails db:rollback STEP=2.

4fill in blank

hard

Fill both blanks to create a command that resets the database and runs all migrations.

Ruby on Rails

rails db:[1] db:[2]

Drag options to blanks, or click blank then click option'

Adrop

Bmigrate

Creset

Dseed

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'drop' instead of 'reset' which does not run migrations automatically.

Using 'seed' which populates data but does not affect schema.

The rails db:reset command drops and recreates the database, then rails db:migrate runs all migrations to set up the schema.

5fill in blank

hard

Fill all three blanks to rollback the last migration, reset the database, and then migrate again.

Ruby on Rails

rails db:[1] db:[2] db:[3]

Drag options to blanks, or click blank then click option'

Adrop

Bmigrate

Creset

Drollback

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'drop' instead of 'reset' which does not run migrations automatically.

Mixing the order of commands.

First, rails db:rollback undoes the last migration, then rails db:reset drops and recreates the database, and finally rails db:migrate runs all migrations again.