Creating migrations in Ruby on Rails - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to generate a new migration named AddAgeToUsers.

Ruby on Rails

rails generate [1] AddAgeToUsers

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Amigration

Bscaffold

Ccontroller

Dmodel

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'model' or 'controller' instead of 'migration'.

Forgetting to specify the migration name.

The rails generate migration command creates a new migration file.

2fill in blank

medium

Complete the migration method to add an integer column named age to users table.

Ruby on Rails

def change
  add_column :users, :age, [1]
end

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A:boolean

B:string

C:date

D:integer

Attempts:

3 left

💡 Hint

Common Mistakes

Using :string or :boolean instead of :integer.

Omitting the column type.

The add_column method needs the column type. Here, :integer is correct for age.

3fill in blank

hard

Fix the error in the migration to remove the age column from users table.

Ruby on Rails

def change
  [1] :users, :age
end

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Aremove_column

Bchange_column

Crename_column

Dadd_column

Attempts:

3 left

💡 Hint

Common Mistakes

Using add_column instead of remove_column.

Using rename_column or change_column incorrectly.

To remove a column, use remove_column method.

4fill in blank

hard

Fill both blanks to create a migration that adds a string column called email to users table.

Ruby on Rails

def change
  [1] :users, :email, [2]
end

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Aadd_column

B:integer

C:string

Dremove_column

Attempts:

3 left

💡 Hint

Common Mistakes

Using remove_column instead of add_column.

Using :integer instead of :string for email.

Use add_column to add a column, and specify :string as the type for email.

5fill in blank

hard

Fill all three blanks to create a migration that renames the column username to login in users table.

Ruby on Rails

def change
  [1] :users, [2], [3]
end

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

Aadd_column

B:username

C:login

Drename_column

Attempts:

3 left

💡 Hint

Common Mistakes

Using add_column instead of rename_column.

Swapping old and new column names.

Use rename_column with the old column name :username and the new name :login.