Uniqueness validation in Ruby on Rails - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add a uniqueness validation for the username attribute in a Rails model.

Ruby on Rails

validates :username, [1]: true

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

Auniqueness

Bpresence

Clength

Dnumericality

Attempts:

3 left

💡 Hint

Common Mistakes

Using presence instead of uniqueness will only check if the field is filled.

Using length or numericality does not check uniqueness.

The uniqueness option ensures that the username is unique in the database.

2fill in blank

medium

Complete the code to make the uniqueness validation case insensitive.

Ruby on Rails

validates :email, uniqueness: { [1]: false }

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

Acase_sensitive

Bcase_insensitive

Cignore_case

Dcase_sensitive_option

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-existent option like case_insensitive.

Setting case_sensitive to true does not ignore case.

Setting case_sensitive: false makes the uniqueness check ignore case differences.

3fill in blank

hard

Fix the error in the uniqueness validation syntax.

Ruby on Rails

validates :nickname, uniqueness: [1]

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

Atrue

Bfalse

C{ case_sensitive: false }

Dnil

Attempts:

3 left

💡 Hint

Common Mistakes

Passing true or false directly when options are needed.

Passing nil causes an error.

The uniqueness validation can take a hash of options. Using { case_sensitive: false } is correct syntax.

4fill in blank

hard

Fill both blanks to add a uniqueness validation scoped to the :account_id attribute.

Ruby on Rails

validates :email, uniqueness: { [1]: :account_id, [2]: false }

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

Ascope

Bcase_sensitive

Cunique

Dignore_case

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect option names like unique or ignore_case.

Mixing up the order of options.

The scope option limits uniqueness to the given attribute, and case_sensitive controls case sensitivity.

5fill in blank

hard

Fill all three blanks to add a uniqueness validation with a custom error message and case insensitivity.

Ruby on Rails

validates :username, uniqueness: { [1]: false, [2]: "[3]" }

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

Acase_sensitive

Bmessage

Chas already been taken

Dscope

Attempts:

3 left

💡 Hint

Common Mistakes

Using scope instead of message for the error text.

Not setting case_sensitive to false for case insensitivity.

Set case_sensitive: false to ignore case, and use message to customize the error text.