Length validation in Ruby on Rails - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to validate that the username is at least 3 characters long.

Ruby on Rails

validates :username, length: { minimum: [1] }

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

A10

B5

C3

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using max instead of minimum

Setting the minimum length too high or too low

The minimum option sets the shortest allowed length. Here, 3 means usernames must be at least 3 characters.

2fill in blank

medium

Complete the code to validate that the password length is between 6 and 12 characters.

Ruby on Rails

validates :password, length: { in: [1] }

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

A6..12

B3..8

C5..10

D8..15

Attempts:

3 left

💡 Hint

Common Mistakes

Using a range that is too short or too long

Using an array instead of a range

The in option uses a Ruby range to specify allowed length. 6..12 means password length must be between 6 and 12 characters inclusive.

3fill in blank

hard

Fix the error in the code to validate that the title length is at most 50 characters.

Ruby on Rails

validates :title, length: { [1]: 50 }

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

Amaximum

Bmax

Cminimum

Dlimit

Attempts:

3 left

💡 Hint

Common Mistakes

Using max instead of maximum

Using limit which is not valid here

The correct key to set the maximum length is maximum. Using max or limit will cause errors.

4fill in blank

hard

Fill both blanks to validate that the email length is exactly 10 characters.

Ruby on Rails

validates :email, length: { [1]: [2] }

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

Ais

Bminimum

C10

Dmaximum

Attempts:

3 left

💡 Hint

Common Mistakes

Using minimum or maximum instead of is

Setting the length to a range instead of a single number

The is key sets an exact length. Setting it to 10 means the email must be exactly 10 characters long.

5fill in blank

hard

Fill all three blanks to validate that the nickname length is between 4 and 8 characters and allow blank values.

Ruby on Rails

validates :nickname, length: { [1]: [2], [3]: true }

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

Ain

B4..8

Callow_blank

Dallow_nil

Attempts:

3 left

💡 Hint

Common Mistakes

Using allow_nil instead of allow_blank

Setting length with minimum and maximum keys separately

The in key sets the length range. allow_blank: true lets the field be empty without error.