ActiveModel::EachValidator (original) (raw)

Active Model EachValidator

EachValidator is a validator which iterates through the attributes given in the options hash invoking the validate_each method passing in the record, attribute, and value.

All Active Model validations are built on top of this validator.

Methods

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Attributes

Class Public methods

Returns a new validator instance. All options will be available via the options reader, however the :attributes option will be removed and instead be made available through the attributes reader.

Source: show | on GitHub

def initialize(options) @attributes = Array(options.delete(:attributes)) raise ArgumentError, ":attributes cannot be blank" if @attributes.empty? super check_validity! end

Instance Public methods

Hook method that gets called by the initializer allowing verification that the arguments supplied are valid. You could for example raise an ArgumentError when invalid options are supplied.

Performs validation on the supplied record. By default this will call validate_each to determine validity therefore subclasses should override validate_each with validation logic.

Source: show | on GitHub

def validate(record) attributes.each do |attribute| value = record.read_attribute_for_validation(attribute) next if (value.nil? && options[:allow_nil]) || (value.blank? && options[:allow_blank]) value = prepare_value_for_validation(value, record, attribute) validate_each(record, attribute, value) end end

Override this method in subclasses with the validation logic, adding errors to the records errors array where necessary.

Source: show | on GitHub

def validate_each(record, attribute, value) raise NotImplementedError, "Subclasses must implement a validate_each(record, attribute, value) method" end