Custom validation methods in Ruby on Rails - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a custom validation method in a Rails model.

Ruby on Rails

class User < ApplicationRecord
  validate :[1]

  def custom_age_check
    errors.add(:age, "must be at least 18") if age < 18
  end
end

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

Acheck_age

Bvalidate_age

Ccustom_age_check

Dage_check

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different method name in the validate call than the method defined.

Forgetting to define the custom validation method.

The method name used in the validate call must match the custom validation method defined in the model.

2fill in blank

medium

Complete the code to add an error message inside the custom validation method.

Ruby on Rails

def check_username
  if username.blank?
    errors.[1](:username, "can't be blank")
  end
end

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

Aappend

Badd_error

Cpush

Dadd

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'add_error' or other incorrect method names.

Forgetting to specify the attribute when adding errors.

The correct method to add an error message in Rails validations is 'errors.add'.

3fill in blank

hard

Fix the error in the custom validation method to correctly check if email contains '@'.

Ruby on Rails

def email_format
  unless email.[1]('@')
    errors.add(:email, "must contain @")
  end
end

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

Ainclude?

Bcontains

Chas

Dincludes

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-existent methods like 'contains' or 'has'.

Forgetting the question mark at the end of 'include?'.

The correct Ruby method to check if a string contains a substring is 'include?'.

4fill in blank

hard

Fill both blanks to create a custom validation that checks if password length is at least 6.

Ruby on Rails

def password_length_check
  if password.[1] < [2]
    errors.add(:password, "is too short")
  end
end

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

Alength

B6

Csize

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'size' instead of 'length' (both work but only one is correct here).

Using the wrong number for minimum length.

Use 'length' to get the password length and compare it to 6 for minimum length validation.

5fill in blank

hard

Fill all three blanks to create a custom validation that adds an error if age is not between 18 and 65.

Ruby on Rails

def age_range_check
  unless age [1] 18 [2] age [3] 65
    errors.add(:age, "must be between 18 and 65")
  end
end

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

A>=

B<=

C&&

D||

Attempts:

3 left

💡 Hint

Common Mistakes

Using '||' instead of '&&' which allows invalid ages.

Reversing the comparison operators.

Check that age is greater or equal to 18 and less or equal to 65 using '>=' and '<=' with '&&' between conditions.