Presence validation in Ruby on Rails - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add a presence validation for the :name attribute in a Rails model.

Ruby on Rails

validates :name, [1]: true

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

Anumericality

Blength

Cpresence

Duniqueness

Attempts:

3 left

💡 Hint

Common Mistakes

Using length instead of presence

Using uniqueness which checks for duplicates, not presence

The presence validation ensures that the attribute is not empty or nil.

2fill in blank

medium

Complete the code to validate presence of :email with a custom error message.

Ruby on Rails

validates :email, presence: [1]

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

Afalse

Btrue

Cnil

Doptional

Attempts:

3 left

💡 Hint

Common Mistakes

Using false disables validation

Using nil or optional are not valid options here

Setting presence: true activates the presence validation.

3fill in blank

hard

Fix the error in the validation code to correctly validate presence of :title.

Ruby on Rails

validates :title, [1]

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

Apresence: true

Bpresence true

Cpresence => true

Dpresence = true

Attempts:

3 left

💡 Hint

Common Mistakes

Using spaces instead of colon

Using => which is old hash rocket syntax but not preferred here

Using equals sign which is invalid

The correct syntax uses a symbol key and colon: presence: true.

4fill in blank

hard

Fill both blanks to add presence validation for :username and a custom error message.

Ruby on Rails

validates :username, [1]: true, message: [2]

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

Apresence

B"can't be blank"

C"must be present"

Dlength

Attempts:

3 left

💡 Hint

Common Mistakes

Using length instead of presence

Not quoting the error message string

Use presence: true to validate presence and provide a custom message string.

5fill in blank

hard

Fill all three blanks to validate presence of :password with allow_nil false and a custom message.

Ruby on Rails

validates :password, [1]: true, [2]: false, message: [3]

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

Apresence

Ballow_nil

C"can't be empty"

Dallow_blank

Attempts:

3 left

💡 Hint

Common Mistakes

Using allow_blank instead of allow_nil

Not quoting the message string

Setting allow_nil to true which disables presence validation

This code validates presence, disallows nil values, and sets a custom error message.