Type:
Module
Active Model Validations
Provides a full validation framework to your objects.
A minimal implementation could be:
1 2 3 4 5 6 7 8 9 | class Person include ActiveModel::Validations attr_accessor :first_name, :last_name validates_each :first_name, :last_name do |record, attr, value| record.errors.add attr, 'starts with z.' if value.to_s[0] == ?z endend |
Which provides you with the full standard validation stack that you know from Active Record:
1 2 3 4 5 6 7 8 | person = Person.newperson.valid? # => trueperson.invalid? # => falseperson.first_name = 'zoolander'person.valid? # => falseperson.invalid? # => trueperson.errors.messages # => {first_name:["starts with z."]} |
Note that ActiveModel::Validations automatically adds an
errors method to your instances initialized with a new
ActiveModel::Errors object, so there is no need for you to do
this manually.