Numericality validation in Ruby on Rails - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to validate that the age attribute is a number.

Ruby on Rails

validates :age, [1]: true

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

Auniqueness

Bpresence

Cnumericality

Dlength

Attempts:

3 left

💡 Hint

Common Mistakes

Using presence instead of numericality

Using uniqueness which checks for duplicates

Using length which checks string length

The numericality validator ensures the attribute is a number.

2fill in blank

medium

Complete the code to validate that the price attribute is a number greater than 0.

Ruby on Rails

validates :price, numericality: { [1]: 0 }

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Agreater_than

Bless_than

Cequal_to

Donly_integer

Attempts:

3 left

💡 Hint

Common Mistakes

Using less_than instead of greater_than

Using equal_to which checks for exact value

Using only_integer which restricts to integers only

The option greater_than: 0 ensures the number is more than zero.

3fill in blank

hard

Fix the error in the validation to allow only integer values for quantity.

Ruby on Rails

validates :quantity, numericality: { [1]: true }

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

Aonly_integer

Bonly_float

Cgreater_than_or_equal_to

Dless_than_or_equal_to

Attempts:

3 left

💡 Hint

Common Mistakes

Using only_float which allows decimals

Using greater_than_or_equal_to which sets a range

Using less_than_or_equal_to which sets a range

The only_integer: true option restricts the value to integers only.

4fill in blank

hard

Fill both blanks to validate that score is an integer between 1 and 10 inclusive.

Ruby on Rails

validates :score, numericality: { only_integer: true, [1]: 1, [2]: 10 }

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

Agreater_than_or_equal_to

Bless_than

Cless_than_or_equal_to

Dgreater_than

Attempts:

3 left

💡 Hint

Common Mistakes

Using less_than instead of less_than_or_equal_to

Using greater_than instead of greater_than_or_equal_to

Mixing up the order of options

Use greater_than_or_equal_to and less_than_or_equal_to to set inclusive range limits.

5fill in blank

hard

Fill all three blanks to validate that discount is a number, greater than or equal to 0, and less than 1.

Ruby on Rails

validates :discount, numericality: { [1]: true, [2]: 0, [3]: 1 }

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

Aonly_integer

Bgreater_than_or_equal_to

Cless_than

Dgreater_than

Attempts:

3 left

💡 Hint

Common Mistakes

Using greater_than instead of greater_than_or_equal_to

Using less_than_or_equal_to instead of less_than

Omitting only_integer when integers are required

The validation requires only_integer: true to restrict to integers, and range limits with greater_than_or_equal_to: 0 and less_than: 1.