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.
# File activemodel/lib/active_model/validator.rb, line 138 def initialize(options) @attributes = Array(options.delete(:attributes)) raise ArgumentError, ":attributes cannot be blank" if @attributes.empty? super check_validity! end
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.
ActiveModel::Validator::new
# File activemodel/lib/active_model/validator.rb, line 166 def check_validity! end
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.
# File activemodel/lib/active_model/validator.rb, line 148 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
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.
# File activemodel/lib/active_model/validator.rb, line 159 def validate_each(record, attribute, value) raise NotImplementedError, "Subclasses must implement a validate_each(record, attribute, value) method" end
Override this method in subclasses with the validation logic, adding errors to the records errors
array where necessary.
© 2004–2021 David Heinemeier Hansson
Licensed under the MIT License.