CODEWITHSUNDEEP
ruby-on-railsrubyvalidation
Brian Low
Brian Low

Reputation: 11811

Validating numericality with the attribute api

The numericality validator does not seem to work with attributes declared with the Attributes API

  class Tester
    include ActiveModel::Model
    include ActiveModel::Attributes

    attribute :units, :integer

    validates :units, numericality: true
  end

  t = Tester.new(units: 'ABC')
  t.valid?                     # => true 
  t.errors.full_messages       # => []

I expected t to be invalid because ABC is not a number. This works if Tester is an ActiveRecord::Base. (Rails 5)

Upvotes: 0

Views: 50

Answers (1)

spickermann
spickermann

Reputation: 106882

There is no error because ActiveModel::Attributes casts the value to the defined type.

In your case 'ABC' is cast to integer and 'ABC'.to_i #=> 0. And 0 is obviously a number.

You can check that by checking the value of t.units after running your example code.

Upvotes: 1

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